Quiz
GENERAL ENGINEERING II
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Perguntas do quiz (149)
1What type of bond exists predominantly in sodium chloride crystal ?
- Aionic bond
- Bmetallic bond
- Ccovalent bond
- Dpolar bond
2Pure metal A undergoes an isothermal transformation in which its crystal structure changes from face centered cubic FCC to body centered cubic BCC. As a result, the volume of a piece of metal A
- Aincreased
- Bdecreased
- Cremains the same
- Ddecreased up to the midpoint of the transformation and then asymptotically reaches its original value
3Which of the following leads to a reduction in the electrical resistivity of a pure metal ?
- Aannealing
- Bcold working
- Cgrain refinement
- Daddition of alloying elements
4The rigidity of polymer can be increased by
- Aall of these
- Bincrease in degree of polymerization
- Cincrease in the extent of cross linking
- Dcrystallization
5Which of the following properties of a metal is insensitive to microstructure ?
- Amodulus of elasticity
- Btensile strength
- Cductility
- Dhardness
6The dominant charge carriers in phosphorus - doped silicon crystal at room temperature are
- Aelectrons
- Belectron holes
- Cprotons
- Dsilicon ions
7Metals are conductive because
- Athe electrons are loosely bound to the nuclei and therefore mobile
- Bthey have a characteristic metallic luster
- Cthey have extra electrons as exhibited by normally positive valence states
- Dthey are on the left side of the periodic table
8An X - ray is
- Aan electromagnetic radiation
- Ba ray of electrons
- Ca ray of helium nuclei
- Dnot known, hence the name " x " ray
9An electron - volt is
- Aa unit of energy equal to the energy possessed by an electron accelerating through a potential of one volt
- Ba voltage unit commonly used when measuring the voltage of the electrons
- Cthe unit of electrical charge of one electron
- Dnone of the above
10Group IA are easily ionized because
- Athey have a single "s" electrons in the outer orbit
- Bthey are metals and therefore conductive
- Cthey react violently in water to liberate hydrogen
- Dthey have relatively low melting points for metal
11The rare earth metals all have very similar chemical properties because :
- Asuccessive members of the series are formed by adding 4f electrons which have little effect on the reactivity
- Bthey are rare, hence little is known about their chemistry
- Cthey melt at extreme temperatures, hence are nearly inert
- Dthey are in separate row at the bottom of the periodic table
12Which of the following group of elements all form crystals of diamond structural lattice ?
- Acarbon, silicon, germanium
- Bcarbon, boron, aluminum
- Ccarbon, cobalt, nickel
- Dlithium, sodium, potassium
13The stress or load where a crystalline material fails is usually less then the predicted from calculated bond strengths in the crystal lattice because
- Athe strength of failure is governed by crystal defects or crystal bond strength
- Bthe stress at failure is not reproducible experimentally
- Cplastic deformation occurs before failure
- Dit is, to date, impossible to calculate something as complicated as the stress at failure
14Which of the following material properties is adversely affected by grain refinement ?
- Acreep resistance
- Btensile strength
- Cductility
- Delastic module
15Which of the following classes of materials exhibit a decreasing electrical conductivity with increasing temperature ?
- Ametals
- Bpure ionic materials
- Cintrinsic semiconductors
- Dp - type semiconductors
16The property that characterizes a material's ability to be drawn into a wire is its
- Aductility
- Btensile strength
- Cfatigue endurance limit
- Dimpact strength
17Which of the following treatments will result in an increase in the fatigue strength of steel ?
- Ashort peening
- Bannealing
- Ccold working
- Dsurface roughening
18In p - type semiconductors, conductivity is provided by
- Athe motion of holes
- Bthe motion of electrons
- Cthe motion of ions
- Dthe motion of conductivity
19A photon is
- Aa particle of electromagnetic radiation
- Ba neutral proton
- Ca neutral electron
- Da charge neutron
20Isotopes of an element are atomic species with
- Athe same number of protons and electrons , but different numbers of neutrons
- Bthe same number electrons , but different numbers of neutrons and protons
- Cthe same number protons , but different numbers of neutrons and electons
- Dthe same number of valence electrons , but different numbers of protons, neutrons and non - valence electrons
21The separation of isotopes of an elements always requires a physical, rather than chemical separation because
- Athe differences in isotopes show up as difference in physical properties
- Bthe atomic mass, a physical characteristic, constitutes the difference between the isotopes
- Cthe electron configuration and, hence, chemical reactivity are the same
- Dall of the above
22The electronic configuration, 1s² 2s² 2p⁶ 3s² 3p⁵ is that of
- Aa halogen
- Ban alkali metal
- Can inert gas
- Da transition metal
23An angstrom unit, commonly used for atomic and sub - atomic distances is equal to
- A10⁻¹⁰ m
- B10¹⁰ m
- C10⁻⁶ m
- Dthe distance light travels in 10⁻¹⁰ seconds
24Which of the following statements about free carrier concentration associated with intrinsic semiconductors at room temperature is valid ?
- Ait decreases with increasing values of energy gap
- Bit increases with increasing values of energy gap
- Cin increases with increasing carrier mobility
- Dit decreases with increasing carrier mobility
25At absolute zero temperature, all the valence electrons in an intrinsic semiconductor
- Aare in the valence bond
- Bare in the forbidden gap
- Care in the conduction bond
- Dare free electrons
26Carrier mobility depends on
- Atemperature and the regularity of the crystal structure
- Bresistivity
- Cconductivity
- Dcharge per carrier
27The movement of changers from an area of higher carrier concentration to an area of lower concentration is called
- Adiffusion
- Bgradient
- Cmobility
- Drecombination
28Which term describes a material whose properties depend on the direction of stress
- Aanisotropic
- Bisotropic
- Cendotropic
- Dasymmetrical
29Materials that emit light in the absence of high heat and continue to emit light after the energy source has been removed are called
- Aphosphorescent
- Bfluorescent
- Csemiconductor - laser diodes
- Dtranslucent diodes
30A gamma ray is composed of
- Ahigh energy electromagnetic radiation
- Bhigh energy protons
- Chigh energy electrons
- Dhigh energy neutrinos
31Plank's constant represents
- Athe ratio between the magnitude of a quantum of radiated energy and its frequency
- Bthe quantum or smallest amount of energy that can be emitted by radiation
- Cthe number of ergs in a kilogram calorie
- Dthe smallest number of any physical significance
32The elements exhibit periodically recurring chemical and physical properties because
- Athe properties are largely determined by the quantum numbers of the outer electrons, all of which except the first which indicates the orbit, recur in each orbit
- Bthey are arrange that way in the periodic table
- Cthe reason is unknown, it is simply observed experimentally
- Dprobability considerations dictate that properties will recur since there are limited number of possibilities
33Which element about crystal dislocations is incorrect ?
- Adislocation in a crystalline lattice is located in an unexpected place
- Bdislocations affect the tensile strength of a crystal
- Cedge, screw and mixed dislocations are possible
- Ddislocation is the defect caused by an atomic misalignment in a crystal
34Ions are formed when
- Aall of these
- Belectrons are displaced from atoms or molecules by bombardment of high energy particles
- Ca salt forms in an acid base neutralization reaction
- Dsalt crystal forms from the reaction of elemental sodium and chlorine
35Which of the following statements about two crystalline forms of carbon, graphite and diamond is not correct ?
- Athe properties of two crystals are, in fact, more similar than dissimilar
- Bthe diamond lattice is transparent to visible light, graphite is not
- Cdiamond is the hardest naturally occurring substance, graphite is soft
- Dat high temperature diamond is a semiconductor, graphite is a conductor
36Avogadro's number represents
- Athe number of molecules in one gram mole of any compound
- Bthe number of molecules in one gram of any compound
- Cthe number of molecules in one liter of any gas at 1 atm pressure and 0°C
- Dthe number of valence electrons in a mole of any element
37Aluminum hydroxide Al(OH)₃ is called an amphoteric hydroxide because
- Ait can react as either an acid or a base
- Bit has limited solubility in water
- Cit contains 3 hydroxyl groups
- Deither one, two or three hydroxyl group can ionize in water
38Which of the following characteristics of the alkaline earth elements is unique
- Athey are in group IIA of the periodic table
- Bthey have two "s" electrons in the outer orbit
- Cthey exhibit a valence of +2
- Dthey are found in soil
39The chemical formula of the salt formed from the neutralization of potassium hydroxide and sulphuric acid is
- AK₂SO₄
- BNaCl
- CP₂SO₄
- DKSO₄
40The chemical formula of the most common compound formed from beryllium and iodine is
- ABeI₂
- BBe₂I₇
- CBeI
- DBe₇I₂
41Which of the following statements about the halogens is incorrect ?
- Athey will react with water to form very strong bases
- Bthey are good oxidizing agents
- Cthey all exhibit a valence of -1
- Dthey form diatomic molecules
42The group VIII elements, called the noble or rare gases, have the following properties
- Athey do not react with other elements
- Bthey are rare
- Cthey are lighter than air
- Dthey remain gaseous down to just few degrees above absolute zero
43Many transition metals exhibit more than one valence state in simple chemical reaction because
- Ad electrons from one orbital down are not as reactive as the s electrons in the outer orbit
- Bs and p electrons in the same orbit have very different reactivities
- Cthe valence state of metals change of the other elements in the molecule change
- Dit is not always possible to predict how even simple reactions will occur
44For this reaction, the equilibrium conditions are
H₂ + I₂ = 2HI ΔH = -7.9 KJ- Atemperature and concentration
- Bpressure, temperature and concentration
- Cpressure only
- Dtemperature only
45Ammonia is prepared by Haber's process
N₂ + 3H₂ = 2NH₃ ΔH = -5.3 KJ
In order to maximize the yield of ammonia, one can:- Aincrease concentrations of hydrogen and nitrogen and decrease the temperature
- Bincrease concentrations of hydrogen and nitrogen and increase the temperature
- Cdecrease concentrations of hydrogen and nitrogen and increase the temperature
- Dincrease the concentrations of all the gases and increase the temperature
46A close system experiences a reversible process where heat rejection is the only energy transfer. The entropy change
- Amust be negative
- Bmust be zero
- Cmust be positive
- Dis equal to the heat transfer
47Consider an air - water vapor mixture similar to the atmosphere. If the dry bulb temperature equals the dew point temperature, the relative humidity will be
- A100 %
- B25 %
- C0 %
- D50 %
48If the temperature of a medium is 0°C, what will be the temperature if it is doubled ?
- A273°C
- B0°C
- C524°R
- D460°R
49The compression ignition cycle is modeled by which ideal cycle ?
- Adiesel cycle
- Botto cycle
- Crankine cycle
- Dbrayton cycle
50An ideal gas is contained in a rigid container. There is no work of a rotating shaft associated with the container. Any heat transfer is a function of
- Atemperature only
- Bpressure only
- Cvolume only
- Dthere cannot be any heat transfer
51In a combustion chamber, fuel is burned to raise the temperature of the medium prior to production of work through an expansion process. The heat generated during the combustion reaction is the
- Aheat of reaction
- Bspecific heat
- Cheat of vaporization
- Dheat of formation
52There are many types of work associated with energy transfer across a boundary. One form of work is flow work which is described by all of the following except
- Ait is associated with a closed system
- Bit is the work which pushes mass in or out of a device
- Cit is necessary to maintain a continuous flow
- Dit is added to the internal energy to obtain enthalpy in the first law for a control volume
53An open system First Law should be utilized for all of the following except
- Aa piston - cylinder device
- Ba nozzle
- Ca turbine
- Da compressor
54An insulated rigid container contains and ideal gas. The container is initially divided in half by a membrane such that one side is a vacuum and the other side contains the ideal gas. The membrane is broken and the gas fills the entire volume. All are true except
- Athe temperature is quadrupled
- Bthe pressure is halved
- Cthe volume is doubled
- Dthe process is irreversible
55An adiabatic process is characterized by which of the following ?
- Athe heat transfer is zero
- Bthe entropy change is zero
- Cthe work is zero
- Dit is reversible
56A rigid container is heated by the sun. There is no shaft work associated with the container. From the First Law of Thermodynamics, you determine the resulting work to be
- Aequal to zero
- Bequal to the heat transter
- Cequal to the volume times the change in pressure
- Dequal to the change in internal energy
57An inventor claims to have built and engineer which will revolutionize the automotive industry. Which of the following would be the best test to determine if the inventors claim is true ?
- Asecond law of thermodynamics
- Bconservation of mass
- Cfirst law of thermodynamics
- Dzeroth law of thermodynamics
58The isentropic efficiency is used to compare actual device such as turbines, compressors, nozzle and diffusers to ideal ones. Which statement is true
- Athe inlet state and exit pressure are the same for both the ideal and actual device
- Bonly the ideal device is considered adiabatic
- Cthe ideal device operate irreversibly
- Dthe efficiency can be greater than one
59The steam power cycle is modeled by the ideal cycle known as the
- Arankine cycle
- Botto cycle
- Cdiesel cycle
- Dbrayton cycle
60In an ideal refrigeration cycle, liquid leaves the condenser and is expanded in such a manner that the enthalpy of the resulting saturated mixture. This type of expansion is known as
- Athrottling process
- Ban isothermal process
- Ca compression process
- Dan isochoric process
61In the case of regenerative gas turbine engine, which of the following is false ?
- Athere is no heat rejected to the atmosphere in a regenerative gas turbine engine
- Bthe regenerator improves the efficiency of the engine
- Cthe exit temperature of the generator is higher than the inlet temperature of the compressor
- Dif the generator is reversible, the effectiveness can approach 100 %
62For an ideal turbojet, all of the following statements are true except
- Athe work produced by the turbine is greater than the work required by the compressor
- Bthe process efficiency of the turbine is 100 %
- Cthe process efficiency of the compressor is 100 %
- Dthe process efficiency of the nozzle is 100 %
63Which of the following statements about the carnot efficiency is not true ?
- Ano reversible power cycles operating between two thermal reservoir can have an efficiency equal to the carnot efficiency
- Bit depends only on the temperatures of the thermal reservoir
- Cit can be used to determine if the cycle is possible or impossible
- Dabsolute temperature scales must be used when performing carnot efficiency calculation
64Two independent intensive properties are required to fix the state of pure, simple compressible substance. People only attempt to fix the state of the medium using heat and work, which are not properties, which of the following statements about heat and work is not true ?
- Aheat and work are point function
- Bheat and work are transient phenomena
- Cheat and work are forms of energy
- Dheat and work are boundary phenomena
65For steady, incompressible, inviscid flow, with no shaft and heat transfer, Bernoulli's equation can be written P/ρ + ½ v² + gz = constant. This form of equation is valid
- Afor rotational flow, but only along streamlines
- Bfor irrotational flow, but only along streamlines
- Cfor rotational flow everywhere
- Dfor rotational flow, but only across streamlines
66The simplified continuity equation ∇V = 0 is not valid for
- Asteady compressible flow
- Bsteady incompressible flow
- Cunsteady incompressible flow
- Dsteady rotational incompressible flow
67How many electrons are there in the outermost octate of a chlorine atom ?
- A7
- B1
- C3
- D8
68Heat transferred at constant volume process to the thermodynamic system of a fixed mass. The thermodynamic system will produce
- Azero work
- Bsmall amount of work
- Cnegative work
- Dpositive work
69Compressibility factor Z is a measure of the deviation of the actual gas behavior from ideal gas. An actual gas behavior may be assumed closed to the ideal gas when compressiblity factor Z approaches
- A1.0
- B0
- C0.5
- D0.75
70Let's assume that the gas can be heated either at constant pressure or at constant volume process. The amount of heat Qp and Qv are transferred to the gas accordingly. If temperature increment per unit mass ΔT = constant, then
- AQp is greater than Qv
- BQp = Qv
- CQp is less than Qv
- DQp = Qv - ΔU
71In manufacturing process 1000 KW of waste heat at temperature 327°C is available for utilization purposes. If the ambient temperature is 27°C, the designed heat engine producing 510 KW of net power will be
- Aimpossible
- Bpossible
- Cirreversible
- Dreversible
72Which of the following instruments for measuring fluid velocity does not need to be calibrated ?
- Apitot static tube
- Borifice meter
- Cventure tube
- Dweir
73Capillarity or the rise or fall of liquid in a thin tube is primarily controlled by which fluid property ?
- Asurface tension
- Bviscosity
- Cdensity
- Dtemperature
74A polytropic process is one in which the functional relationship between pressure and volume is given by PV ᴺ = constant with N value from -∞ to +∞ depending on the particular process. A constant volume process is represented by N equals
- A∞
- Bzero
- C2
- DK
75Cavitation in fluid mechanics refers to
- Aa liquid to gaseous phase transition of the fluid due to low pressure
- Bthe oscillation of a plate due to turbulent fluctuations
- Cthe condensation of the vapor into liquid due to high pressure
- Dthe violation of the no slip condition on the wall
76A large class of devices involve work. Assuming reversible steady state, steady flow process with negligible changes in kinetic and potential energy, the elementary work is
- A- Vdp
- BpdV
- CVdp + pdV
- DVdp - pdV
77The reheat rankine cycle is proposed to decrease
- Amoisture content in the low pressure stages of the turbine
- Bmass flow rate of cooling water in the condenser
- Cback pressure of the turbine
- Dvolumetric flow rate of the working fluid
78In compressible fluid mechanics, a shock wave is considered normal shock wave when
- Athe angle between the direction of flow and the wave is 90°
- Bthe shock wave occurs in air
- Cthe shock wave occurs at oblique angle to the flow
- Dthe flow remains supersonic on both sides of the shock wave
79Which of the following statements defines best the capitalized cost ?
- Ais the present worth of a specified uniform cash flow for an infinite analysis period
- Bit is the initial cost of some equipment
- Cit is the salvage value of an equipment
- Dit is the amount of money equal to the cost minus benefit for an equipment
80Which of the following is not taken into account in making an economic decision between two alternative equipment ?
- Areliability
- Boperating cost
- Crate of return
- Dsalvage value
81A heat sink will dissipate heat energy more rapidly if
- Aits surface area is increased
- Bits temperature is the same as the temperature of the surrounding air
- Cit is covered by a material having a high thermal resistance
- Dit is kept away from air current
82A reference frame which remains fixed while fluid flows through is called
- AEulerian
- BLagrangian
- CStokesian
- DA Navier - Stokes reference frame
83For steady incompressible fully developed flow in a constant area pipe, friction along the walls of the pipe causes.
- Aa reduction in static pressure along the length of the pipe
- Ba reduction in mass flow rate along the length of pipe
- Ca reduction of velocity along the length of pipe
- Dan increase in the darcy friction factor along the length of the pipe
84Select the answer which correctly ranks fluid meters from lowest to highest pressure loss
- Aventuri tube, flow nozzle, thin plate orifice
- Bventuri tube,thin plate orifice, flow nozzle
- Cthin plate orifice, venturi tube, flow nozzle
- Dflow nozzle, thin plate orifice, venturi tube
85Identify which of the following problems for which the Moody chart would not be of use
- Aflow in subsonic diffuser
- Bflow of natural gas in long pipe
- Cflow of oil in a long channel with square cross section
- Dflow of water in a pipe at very high speed where the flow is extremely turbulent
86Effective interest rate per year is defined as
- Athe annual interest rate taking into account the effect of any compounding during the year
- Bthe nominal interest rate per year
- Cthe rate of return that can be realized from an investment
- Dthe interest rate per period times the number of periods per year
87During inflationary time, which of the following statements best describes the best the loan payments of a fixed amount ?
- Afuture payments in year zero dollars are not constant in amount
- Bfuture payments are worth more in year zero dollars
- Cin actual dollars, the amount of future payments decreases
- Dyear zero dollars are worth less then future dollars
88A pump is used to increase the pressure of water entering the boiler of steam power cycle. Which statement is true concerning the pump ?
- Athe enthalpy of water leaving the pump is higher than the enthalpy of water entering the pump
- Bthe pump produces work
- Cthe pump has no effect on the cycle
- Dthe enthalpy is constant during the process
89Which of the following is not a unit of pressure ?
- Akg / m²
- BPa
- Cbars
- DN / m²
90Which of the following is the definition of Joule ?
- AN - m
- Ba unit of power
- Ckg - m / s²
- Drate of change of energy
91Which of the following relations defines enthalpy ?
- AH = U + PV
- BH = U + P / T
- CH = U + P / V
- DH = PV + T
92How is the quality x of a liquid vapor mixture defined ?
- Athe fraction of the total mass that is saturated vapor
- Bthe fraction of the total volume that is saturated vapor
- Cthe fraction of total volume that is saturated liquid
- Dthe fraction of the total mass that is saturated liquid
93What is the actual shape of the methane CH₄ molecule ?
- Aa tetrahedral
- Blinear
- Csquare planar
- Dpyramidal
94What is the oxidation state of the nitrogen in NO₃⁻ ?
- A+ 5
- B- 1
- C+ 3
- D+ 1
95What is the oxidation number of Cr in the dicromate ion (Cr₂O₇) ²⁻
- A+ 6
- B- 1
- C0
- D7
96Reactions generally proceed faster at higher temperature because of which of the following ?
- Athe activation energy is less
- Bthe molecules are less energetic
- Cthe bonds are easier to break
- Dthe molecules collide more frequently
97Determine the height of the centroid of the semi - circle with radius r from its diameter
- A4r / 3π
- B2r / 3
- C2πr /3
- D3r / 4π
98What are valence electrons ?
- Athe outer shell electrons
- Belectrons with positive charge
- Cthe electrons of complete quantum shells
- Dthe K - quantum shell electrons
99What is the strong bond between hydrogen atoms known as ?
- Acovalent bond
- Bionic bond
- Cmetallic bond
- Dionic and metallic bond
100What are Van der Waals forces ?
- Aweak secondary bonds between atoms
- Bprimary bonds between atoms
- Cforces between electrons and protons
- Dforces present only in gases
101Compare the metallic iron form Fe and the ferric ions Fe²⁺ and Fe³⁺. Which has the smallest atomic radius of the same temperature ?
- AFe³⁺
- BFe²⁺
- CFe
- Dthey have the same radii
102Polymers that favor crystallization are least likely to have which of the following
- Aan atactic configuration of side group
- Bsmall side group
- Conly one repeating unit
- Dsmall chain length
103In general, what are the effects of cold working a metal ?
- Aincrease strength, decrease ductility
- Bincrease strength, increase ductility
- Cdecrease strength, decrease ductility
- Ddecrease strength, increase ductility
104Which of the following is not structural class steel ?
- Atool and die
- Bcarbon
- Cstainless
- Dlow - alloy
105Which of the following phases of steel has face - centered cubic structure ?
- Aaustenite
- Bferrite
- Cpearlite
- Dmartensite
106The state of a thermodynamic system is always defined by its
- Aproperties
- Babsolute temperature
- Cprocess
- Dtemperature and pressure
107Mathematically, a thermodynamic property is which of the following ?
- Aa point function
- Ba path function
- Can exact differential
- Ddiscontinuous
108The first law of thermodynamics states that
- Aenergy can neither be created nor destroyed
- Bheat energy cannot be completely transformed into work
- Cinternal energy is due to molecular motion
- Dentropy of the universe is increased by irreversible process
109In terms of QH and QL, the network of a carnot cycle is
- AW = QH - QL
- BW = QH - QL / QL
- CW = QL / QH - QL
- DW = QL - QH
110Is any non - quasistatic thermodynamic process, the over - all entropy of an isolated system will
- Aincrease only
- Bdecrease only
- Cstay the same
- Ddecrease and then increase
111Entropy is the measure of
- Arandomness or disorder
- Bthe change in enthalpy of the system
- Cthe internal energy of the gas
- Dthe heat capacity of the substance
112For spontaneously occurring natural process in an isolated system, which expression best express dS ?
- AdS is greater than 0
- BdS equals 0
- CdS is less than zero
- DdS = dQ / T
113Energy changes are represented by all except
- AdQ rev / T
- Bnegative integral of VdP
- CmCpdT
- DTdS - PdV
114Work or energy can be a function of all of the following except
- Aforce and time
- Bforce and distance
- Ctoque and angular acceleration
- Dpower and time
115U + PV is a quantity called
- Aenthalpy
- Bflow energy
- Cshaft work
- Dentropy
116In flow process, neglecting KE and PE changes, negative integral of Vdp represents
- Ashaft work
- Bheat transfer
- Cclosed system work
- Dflow energy
117Power may be expressed in units of
- ABTU / hr
- Bft - lbs
- CHP - hours
- DKW - hours
118Equilibrium condition exist in all except which of the following ?
- Ain steady state flow process
- Bin reversible process
- Cin process where driving forces are infinitesimals
- Dwhere nothing can occur without an effect on the system's surroundings
119Name the process that has no heat transfer
- Aisentropic
- Bisothermal
- Cquasistatic
- Dpolytropic
120An ideal gas ( k = 1.4 ) is expanded in a nozzle from Po = 1.5 MPa, To = 150°C, Vo = 0, to P₂ = 0.3 MPa. Assuming reversible adiabatic process the nozzle should be
- Aconvergent - divergent
- Bdiverging
- Cconverging
- Dconstant cross section
121Enthalpy of an ideal gas is a function only of
- Atemperature
- Bentropy
- Cpressure
- Dinternal energy
122A small plastic bag is filled with moist air at 50% relative humidity, sealed and placed in an environmental chamber whose temperature and pressure may be independently varied. The relative humidity of the bag will lower under which of the following conditions
- Apressure is decreased
- Bpressure is increased
- Ctemperature is decrease
- Dtemperature is decreased and pressure in increased
123The rate of heat transfer through a given section of a uniform wall or a given temperature difference is
- Adirectly proportional to the thermal conductivity and inversely proportional to the thickness of the wall
- Bdirectly proportional to the thermal conductivity and to the thickness of the wall
- Cinversely proportional to the thermal conductivity and directly proportional thickness of the wall
- Dinversely proportional to the thermal conductivity and to the thickness of the wall
124Which of the following metals has the highest specific heat capacity at 100°C ?
- Aaluminum
- Bbismuth
- Ccopper
- Diron
125The radical ion (NO₂)⁻ is called
- Anitrite
- Bnitrate
- Cnitride
- Dbinitrite
126a sample of a substance to which chemical formula can be assigned, whose weight is equal to its formula weight is termed as
- Amole
- Bmolecule
- Cgram equivalent weight
- Datom
127The number of molecules in 22.4 L of a substance in its gaseous state is called
- AAvogadro's number
- BDulong's number
- CPetit's number
- DGraham's number
128Which of the following radioactive decay results in an increased Z or number of protons in the nucleus ?
- Anegative beta decay ( electron emission )
- Balpha decay ( helium nucleus emission )
- Cpositive beta decay ( positron emission )
- Dgamma emission ( photon energy emission )
129The relationship between the extension of a spring and the force required to produce the extension is
- AF = kx
- BF = ma
- CF = μN
- DF = mv² / r
130The deflection of beam is
- Ainversely proportional to the modulus of elasticity and the moment of inertia
- Bdirectly proportional to the modulus of elasticity and the moment of inertia
- Cinversely proportional to the modulus of elasticity and the length of the beam cube
- Dinversely proportional to the weight and length
131Hard water is water which contains soluble salts of which of the following
- Acalcium
- Bsodium
- Csulfur
- Dchlorine
132A homogeneous round bar of diameter D, length L and total weight W is hung vertically from one end. If E is the modulus of elasticity, what is the total elongation of the bar ?
- A2WL / πD²E
- BWL / πD²E
- CWL / 2πD²E
- DWL / 2E
133A thin walled pressurized vessel consist of a right circular cylinder with flat ends. Midway between the ends the stress is greatest in what direction ?
- Acircumferential
- Blongitudinal
- Cradial
- Dat an angle of 45° to the longitudinal and circumferential directions
134The stress concentration factor
- Ais the ratio of the maximum stress produced in a cross section to the allowable stress
- Bis the ratio of the average stress produced in a cross section to the allowable stress
- Cis the ratio of areas involved in the sudden change in cross section
- Dcannot be evaluated for brittle material
135Poisson's ratio is the ratio of
- Aunit lateral deformation to the unit of longitudinal deformation
- Bunit stress to unit strain
- Celastic limit to proportional limit
- Dshear strain to compressive strain
136The modulus of rigidity of a steel member is
- Adefined as the unit shear stress divided by the unit shear deformation
- Ba function of the length and depth
- Cequal to the modulus of elasticity divided by one Poise
- Ddefined as the length divided by the moment of inertia
137A thin homogeneous metallic plate containing a hole is heated sufficiently to cause expansion. If the coefficient of surface expansion is linear, the area of the hole will
- Aincrease at the same rate as the area of the metal increases
- Bdecrease at the same rate as the area of the metal increases
- Cstay the same
- Dincrease at twice the rate of the are of the metal increases
138Hooke's law for an isotropic homogeneous medium experiencing one dimensional stress is
- Astress = E ⋅ strain
- Bstrain = E ⋅ stress
- Cstrain energy = E ⋅ internal energy
- DForce ⋅ area = E ⋅ change in length / length
139The three moment equation may be used to analyze
- Acontinuous beam
- Bbeam loaded at the third point
- Ca three element composite beam
- Da step tapered column
140The area of the shear diagram of a beam between any two points on the beam is equal to the
- Achange in the moment between the two points
- Bchange in the shear between the two points
- Ctotal shear beyond the two points
- Daverage moment between the two points
141Fixing both ends of a simply supported beam that has only a concentrated load at midspan will increase the allowed load by
- A100 %
- B50 %
- C25 %
- Dno change
142Young's modulus of elasticity for a material can be calculated indirectly form which of the following properties of material ?
- Adensity and velocity of sound in the material
- Btemperature coefficient of expansion and dielectric constant
- Ctemperature coefficient of expansion and specific heat
- Ddensity and interatomic spacing in the material
143Modulus of resilience is
- Athe measure of a materials ability to store strain energy
- Bthe same as the modulus of elasticity
- Cthe reciprocal of the modulus of elasticity
- Da measure of the deflection of a member
144When a metal is cold worked, all of the following generally occur except
- Agrains become equi - axed
- Bductility increases
- Ctensile strength increases
- Drecrystallization temperature decreases
145Instrinsic silicon becomes extrinsically conductive, with electrons as majority carriers, when doped with
- Aantimony
- Bboron
- Cgermanium
- Daluminum
146Steel can be strengthened by the following except
- Aannealing
- Bquenching and tempering
- Cwork hardening
- Dgrain refinement
147If 1080 steel ( 0.8 % wt C ) is annealed by very slow cooling from 1000°C to ambient temperature, its microstructure will consist of almost solely of
- Apearlite
- Baustenite
- Cbainite
- Dcementite
148Which of the following is not a method of non destructive testing of steel castings and forgings ?
- Achemical analysis
- Bradiography
- Cmagnetic particles
- Dultrasonic
149Compressive strength of fully cured concrete is most directly related to
- Awater - cement ratio
- Bsand gravel ratio
- Cfineness modulus
- Daggregate gradation
Informações
- Descrição
- Quiz sobre GENERAL ENGINEERING II, criado por shuree em 18-04-2015.
- Autor
- shuree
- Idioma
- English
- Visualizações
- 321
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