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Perguntas do quiz (131)
1What is the maximum allowable primary current of a 2 KVA step - down transformer with a four to one turns ratio if connected across a 440 volt line?
- A4.5 amps
- B1.1 amps
- C18.1 amps
- D27.7 amps
2The open-circuit voltage of a fully charged lead-acid battery cell is _______ .
- A2.0 volts
- B2.3 volts
- C1.5 volts
- D1.8 volts
3A milliammeter, with a full scale deflection reading of 100 milliamps, is known to have an accuracy of + or - 2%. A meter reading of 10 milliamps would indicate a line current of between.
- A9.8 and 10.2 milliamperes
- B8.0 and 12.0 milliamperes
- C9.8 and 10.0 milliamperes
- D8.0 and 10.0 milliamperes
4Basic electrical motor action depends on_______.
- Aa current carrying conductor placed in a magnetic field
- Ba conductor rotated within a magnetic field
- Cthe relative force of the commutator and commutating poles
- Dthe relative force of the armature and interpoles
5What is the function of damper windings in a synchronous motor ?
- ADC voltage to the field
- BAC voltage to the armature
- CAC voltage to the field
- DDC voltage to the armature
6The Wheatstone bridge is a precision measuring instrument utilizing the principle of changes in____ .
- Aresistance
- Bamperage
- Cinductance
- Dcapacitance
7"The rated temperature rise of an electric motor is the_______.
.
"- Anormal temperature rise above the standard ambient temperature at rated load
- Baverage temperature at any given latitude
- Caverage temperature rise due to resistance at 10% overload
- Dpermissible difference in the ambient temperature of the motor due to existing weather conditions
8The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the______.
- Amain switchboard
- Bbridge control panel
- Cdisconnect links
- Dgovernor relay box
9Voltage generated by most AC generators is fed from the machine to the bus by means of ____ .
- Adirect connections from the stator
- Bbrushes on slip rings
- Cbrushes on a commutator
- Dslip rings on a commutator
10Battery charging rooms should be well ventilated because the charging process produces ______.
- Aexplosive gases
- Bcorrosive gases
- Chighly poisonous gas
- Dhighly combustible oxygen
11Battery charging rooms should be well ventilated because the charging process produces ______.
- Aexplosive gases
- Bcorrosive gases
- Chighly poisonous gas
- Dhighly combustible oxygen
12When reading electrical motor controller diagrams, it helps to know that________.
- Acurrent paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines
- Bcurrent paths in the control circuit are drawn as heavy lines and in the power circuit as lighter lines
- Ccircuits subject to 500 volts or greater are drawn as heavy lines and below 500 volts as lighter lines
- Dcircuits subject to 500 volts or greater are drawn as light lines and below 500 volts as heavy lines
13A device that utilizes the principle of electromagnetic induction is the______ .
- Atransformer
- Bdiode
- Ctransistor
- Drheostat
14Amortisseur windings are installed in a synchronous motor to_____.
- Aprovide a means for starting
- Beliminate arcing between the stator and the rotor
- Cproduce a higher power factor
- Dreduce eddy current losses
15Which of the following physical characteristics does a wound- rotor induction motor possess that a squirrel cage motor has none?
- ASlip rings
- BEnd rings
- CA centrifugal switch
- DEnd plates
16In an induction motor, rotor currents are circulated in the rotor by________.
- Ainductive reaction of the rotating stator field
- Bexternal variable resistors
- Cslip rings and brushes
- Dan armature and brushes
17Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the ________.
- Avoltage regulator
- Bgovernor speed droop setting
- Cbalance coil
- Dphase-balance relay
18"A low voltage source is being used for testing armature coils. A
coil short circuit will be indicated by a ___________.
"- Alow or zero voltage reading, while the other coils will have higher readings
- Bhigh voltage reading, while the other coil readings will have an equal or lower value
- Cfluctuating voltmeter reading, while the other coil readings are steady
- Dsteady voltmeter reading, while the other coil readings are fluctuating
19When measuring AC current flow, you must always connect the meter ___________.
- Ain series with the power source and load
- Bin parallel with the power source and load
- Cinsuring correct polarity
- Dusing the lowest range possible to prevent instrument damage
20To increase the frequency of an operating AC generator, you should __________.
- Aincrease the speed of the prime mover
- Bincrease the field excitation
- Cdecrease the field excitation
- Dincrease the number of magnetic poles
21An electrical device which prevents action from occurring until all other required conditions are met is called _______.
- Ainterlock
- Blimit
- Cmonitor
- Dmodulator
22The main purpose of the auxiliary winding on a split-phase, single- phase motor is to_______ .
- Astart the motor
- Blimit the starting voltage
- Cincrease the starting current
- Dkeep the motor running in the event the main winding should fail
23The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as_______.
- Aline loss
- Bline droop
- CIR drop
- Dhysteresis
24The greatest detrimental effect on idle electrical equipment, such as cargo pump motor is the_______.
- Aabsorption of moisture in the insulation
- Bloss of residual magnetism
- Cinsulation varnish flaking
- Ddirt collecting on the windings
25"An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a_______.
.
"- Aship's service alternator
- Bmagnetic amplifier
- Cthree-wire DC generator
- Dsaturable core reactor
26"A circuit breaker differs from a fuse, in that a circuit breaker_________.
.
"- Atrips to break the circuit and may be reset
- Bmelts and must be replaced
- Cis enclosed in a tube of insulating material with metal ferrules at each end
- Dgives no visual indication of having opened the circuit
27AC circuits possess characteristics of resistance, inductance, and capacitance. The capacitive reactance of a circuit is expressed in_____ .
- Aohms
- Bmhos
- Chenrys
- Dfarads
28The frequency output of an operating alternator is controlled by the______ . .
- Arelative speed of the rotor poles
- Bnumber of turns of wire in the armature coil
- Cstrength of the magnets used
- Doutput voltage
29Which of the following types of motors is often designed for use in correcting power factor?
- ASynchronous
- BPolyphase
- CWound-rotor
- DInduction
30The purpose of a cage rotor winding placed on the rotor of a synchronous motor is to ________.
- Astart the machine as an induction motor
- Bprovide excitation to the DC field
- Ccontribute extra torque at synchronous speed
- Dprevent the machine from falling out of step
31A constant output voltage from an AC generator is maintained by the_________.
- Avoltage regulator
- Breverse power relay
- Cexciter generator
- Dprime mover governor
32The capacity of a storage battery is measured in_______.
- Aampere-hours
- Bvolts
- Cfarads
- Damps
33The rated temperature and rise of an electric motor is the ______.
- Anormal temperature rise above the standard ambient temperature at rated load
- Baverage temperature at any given latitude
- Caverage temperature rise due to resistance at 10% overload
34"In an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the_______ .
.
"- Avoltage regulator
- Bgovernor speed droop setting
- Cbalance coil
35What should you do to the charging current when a lead-acid battery gassing freely while receiving a normal charge?
- AReduce
- BIncrease
- CStop
- DNo adjustment needed
36External shunts are sometimes used with ammeters to _____.
- Aprevent damage to the meter movement from heat generated by the internal shunt
- Bincrease meter sensitivity
- Cpermit shunts with larger resistance to be utilized
- Dreduce reactive power factor error
37What is a common method used to control the speed of the AC propulsion motor on a diesel-electric propulsion ship?
- AChange the input frequency of the voltage to the motor
- BIncrease the motor voltage
- CDecrease the motor voltage
38What keep the line losses in a distribution circuit at minimum?
- AUse higher voltage and lower current
- BIncrease the number of thermal relays in the circuit
- CUse higher current and lower voltage
- DAdd rubber insulation conductors to the circuit
39The Wheatstone bridge is a precision measuring instrument utilizing the principle of changes in ____.
- Aresistance
- Binductance
- Ccapacitance
- Damperage
40In a compound-wound motor, where is a portion of the line current flows through?
- AShunt field coils
- BInertia poles
- CStator
- DFrame
41How does the speed of a synchronous motor change?
- AChanging the input frequency
- BInterchanging any tow of the three live leads
- CChanging the voltage of the system
- DIncreasing the field excitation
42Which of the following is the function of an automatic voltage regulators provided on main switchboards?
- AIt varies field excitation to the generators
- BIt governs prime mover speed to control voltage
- CProtect the switchboard from high voltage
- DRegulate the AC load on the generator
43What will happen if you reverse the DC current flow through an electrical coil?
- AIts two-pole field will reverse
- BIt will reduce the amount of flux produced
- CIt will change its impedance
- DIt will reduce the power consumed
44Power transformers are rated in _____.
- Akilovoltamperes
- Bkilowatt-amps
- Campere-turns
- Dkilowatt-volts
45When the voltage and the current developed in an AC circuit reach their peak values at the same time, the power factor is considered to be _____.
- Aunity
- Blagging
- Cleading
- Dinfinity
46When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is ___.
- Amaximum
- Blagging
- Cleading
- Dminimum
47The operating torque of the disk or timer element in an AC reverse power relay is obtained from _____.
- Aelectromagnets
- Bline voltage
- Ca separate battery source
- Dthe main bus
48One important difference between wye-connected and delta-connected generators is that delta connections have ____.
- Aline voltage equal to the phase voltage
- Bline voltages equal to the vector sum of the phase voltages
- Cphase voltage 90º out of sync
- Dline current equal to the phase current
49The load sharing characteristics of two diesel alternators operating in parallel are directly related to the setting of their governors’_____.
- Aspeed droop
- BLoad limit
- Cidle speed
- Dspeed limit
50Why is the engine room watch officers should keep a constant check on the loads carried by electric motors?
- AExceeding nameplate value shortens useful life
- BLow loads necessitate frequent insulation cleaning
- CResidual magnetism may increase
- DEnergy is wasted if full loading is not utilized
51Which of the listed conditions could cause a recently overhauled DC motor to have excessively hot winding and sparking at the brushed?
- AReversed interpole polarity
- BLow series field current
- CHigh shunt field current
- DExcessive humidity
52Which of the following starting system should be carried out after overhaul of a motor?
- ANo load
- BLow speed
- CHigh speed
- DMedium speed
53What is the common source of field excitation for synchronous motors?
- ADC rectifier
- BLow voltage battery
- CMotor attenuator set
- DAC supply
54What is a component used to protect the DC generator circuits against malfunctions due to prime mover power loss?
- AReverse current relays
- BMain bus disconnect links
- CA separate battery back-up
- DReverse power relays
55Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in _______.
- Amotor starting circuit
- Bmain lighting circuits
- Cemergency lighting circuits
- Dgeneral alarm circuits
56Equalization of the power factors of two alternators operating in parallel is accomplishedin what manner?
- AAccomplish automatically by the automatic voltage regulator
- BManually adjusting the governor controls
- CManually adjusting the output of current transformers
- DAccomplish automatically by the designed action of the governors
57Which of the following electrical instrument is the safest to use in taking the current even without switching off or opening the circuit?
- AClamp meter
- BMeager tester
- CAmmeter
- DMulti tester
58Relative to the secondary winding of a step-up transformer, the primary winding will have ____.
- Afewer turns
- Bmore turns
- Csame number of turns but smaller wires
- Dtwice as many turns
59What will happen if connections on a DC shunt motor are changed on either the field connections, or the armature connections?
- ADirection of rotation will be reversed
- BMotor will not run
- CDirection of rotation will be the same
- DMotor will run as a generator
60What is the purpose of DC generator brushes?
- AConduct electric current to an outside current
- BNeutralize armature reaction
- CConvert DC current to AC current
- DProvide excitation to a DC generator
61A switchboard for an AC electrical system requires the use of which of the following devices?
- AFrequency meter
- BOhmmeter
- CInduction voltage regulator
- DCurrent transformer governor
62A bus disconnect link is used to isolate ___.
- Athe generator circuit breaker from the bus
- Bone bus bar from the ground detection system
- Cdifferent bus phases form the equalizer connection
- Dpositive and negative buses from the neutral
63The purpose of a magnetic relay is to ______.
- Aremotely open and close contacts
- Bopen a circuit only in the event of overload
- Cprovide overcurrent protection during starting
- Drelay voltages at increased power
64As storage battery for an emergency lighting and power system must have the capacity to ____.
- Aclose all watertight doors twice
- Bopen all watertight doors four time.
- Copen and close all watertight doors in six consecutive cycles within a 20 second period
- Dnone of the above
65On an engine throttle control system, the auxiliary control circuits are provided with devices to prevent excessive over travel of the actuating valve by the control motor. What are these devices?
- ALimit switches
- BOverlap sensors
- CDifferential relays
- DAnalog relays
66The shunt of a DC ammeter should be connected in _____.
- Aseries with the load and in parallel with the meter movement
- Bparallel with the load in series with the meter movement
- Cparallel with the load and in parallel with the meter movement
- Dseries with the load and in series with the meter movement
67When a transformer is used to step-down voltage, the low voltage winding is ___.
- Athe secondary coil
- Bpart of the core
- Cthe primary coil
- Dnot insulated
68What inidicates a violent gassing developed by a lead-acid battery during charging?
- ACharging rate is excessive
- BPlate separators are grounded
- CCell voltages are excessive
- DSpecific gravity is insufficient
69When the non-essential load has been removed from the feeder system but the service generator remains overloaded, what device automatically activates?
- AOvercurrent tripping device
- BPreferential tripping system
- CTime delay trip device
- DACB trip device
70What is the function of capacitors which are commonly used on power supply circuits for engine room automation consoles?
- ATo filter out ripple for rectification
- Bprevent overloads
- Cact as a permanent load
- Ddecrease the average value of the output voltage
71What do you call the device where a low input voltage is imparted to it which then delivers a high output voltage?
- AStep-up transformer
- BPrimary transformer
- CSecondary transformer
- DStep-down transformer
72What electrical component intitiates the division of the reactive KVA load between paralleled AC generators?
- AVoltage regulators
- BPrime mover governors
- CProportioner
- DPhase balance relay
73The circuit power factor of an AC generator operating singularly is determined by the ____.
- Aconnected load
- Bprime mover speed
- Cground current
- Dgenerator’s rated voltage
74What do you call a torque produced by a motor when the shaft will not turn, even though rated voltage is applied to the stator?
- ALocked rotor torque
- BPullout torques
- CBreakdown torque
- DTorque margin
75What will happen if you reverse the DC current flow through an electrical coil?
- AReverse its two-pole field
- BReduce the power consumed
- CChange its impedance
- DReduce the amount of flux produced
76Which of the following provides the initial torque to turn a DC generator?
- AA mechanical prime mover
- BResidual magnetism in the armature
- CResidual magnetism in the field poles
- DResidual magnetism in voltage regulator
77The division of kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the ____.
- Aprime mover governors
- Breverse power relays
- Cfield rheostat
- Dvoltage regulators
78On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. How should the speed above this be obtained?
- ARaise the generator engine speed
- BRotate brush alignment
- CDecrease excitation
- DLower the generator engine speed
79What do you call a DC generator used to supply direct current in order to maintain an AC generator field?
- AExciter
- BRotor
- CStator
- DArmature
80Transformer cores are laminated to reduce ____.
- Aeddy currents
- Bsecondary flux
- Cleakage flux
- Dtertiary flux
81To test the feeder system for grounding, the three earth lamps will be activated when this switch is manipulated.
- AThe push button switch
- BSelector switch
- CMicro switch
- DLamp switch
82A transformer works on the basic principle of ____.
- Amutual induction
- Bself impedance
- Cattraction and repulsion
- Dincreasing power
83What is the simplest method of controlling the terminal voltage of compound-wound DC generator?
- AWith a hand-operated field rheostat connected in series with line shunt field circuit
- BSeparate exciter in a series with the shunt field
- CCarbon pile regulator in series with load
- DBalance coil diverting neutral current through the shunt field
84Which of the following types of motor has two separate field windings usually connected in parallel with the armature circuit?
- ACompound-wound motor
- BSeries-wound motor
- CShunt-wound motor
- DInduction motor
85Which of the following types of motor whose speed at normal operation is constant or practically constant?
- AUniversal motor
- BSeries-wound motor
- CSynchronous speed motor
- DRegulated speed motor
86A circuit with a blown fuse would be described as ____ _____
- Aopen circuit
- Bshort circuit
- Cbonded circuit
- Dgrounded circuit
87How would you describe a circuit with a blown fuse?
- AOpen circuit
- BShort circuit
- CBonded circuit
- DGrounded circuit
88Which of the following operating characteristics for DC motors is considered to give high starting torque?
- ASeries
- BShunt
- CCumulative-compound
- DDifferential-compound
89The resistance value of a resistor in a circuit can best be determined by the ______.
- Aband markings on the resistor
- Bsingle solid body color of the resistor
- Camperage value written on the resistor
- Dphysical size of the resistor
90What is the recommended practice on the frequency of the incoming machine prior to closing the breaker when paralleling two AC generators?
- ASlightly greater than the line frequency
- BSlightly less than the line frequency
- CThe same as the line frequency
- DGreater than the line frequency
91When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer rotating in what direction?
- AFAST direction, just before the 12 o’clock position
- BSLOW direction, just before the 12 o’clock position
- CFAST direction, just after the 12 o’clock position
- DSLOW direction, just after the 12 o’clock position
92What is the characteristic of the mica used in the commutators of DC machinery?
- AHarder than copper
- BSofter than copper
- CSame hardness as copper
- DSofter than copper but wears away at slower rate
93Regarding an induction motor, where is the output power developed related to?
- ASlip of the rotor
- BSpeed of the rotating field
- CDC filed excitation
- DCurrent flow in the interpoles
94What type of AC single-phase motor will also operate on direct current?
- ASeries-wound
- Bsplit-phase
- CShaded-pole
- DRepulsion-start
95 What do you call an AC motor which uses rheostat in the motor circuit to vary the speed?
- AWound rotor induction motor
- BSquirrel cage induction motor
- CRegenerative braking motor
- DSquirrel-cage induction motor
96Which of the following is the most common of excitation for synchronous motor?
- ADC supply
- BStep-up transformer
- CAC supply
- DPoor contact of brushes
97Which of the listed transformers uses a single winding to produce voltage transformation?
- AAutotransformers
- BStep up transformers
- CStepdown transformers
- DIsolation transformers
98What type of electric motor is commonly used to start small auxiliary diesel engines?
- ASeries
- BSynchronous
- CCage
- DShunt
99Which of the following electric motors would be the most reliable to use on the open main deck of a vessel?
- AWatertight motors
- BSynchronous motors
- CDrip proof motors
- DSquirrel cage motors
100When a megohmmeter is used to test the dielectric strength of wire insulation, what causes the intial dip of the pointer toward zero?
- AThe capacitance of the circuit
- BThe dielectric absorption effect of the insulation
- CThe leakage of current along the surface of dirty insulation
- DGood insulation
101On a modern 13 amp square pin electric plugs, which of the following statements is true ?
- AThe fuse is at the neutral connection.
- BThe neutral wire is coloured brown.
- CThe live wire is coloured blue.
- DThe earth wire goes to the centre top connection.
102The timer element of a reverse power relay will activate when ___
- Athe power flow is the same as the tripping direction
- Bthe power flow is the opposite to the tripping direction
- Cthe movement if the disk is damped by a permanent magnet
- Dthe load difference generators is more than 10 percent
103The difference between the synchronous speed of a three phase induction motor and its operating speed is called slip and may be correctly expressed as_______.
- Aa percent of synchronous speed
- Bthe reduced amp rating
- Cthe decrease in shaft torque
- Dreduced fuel consumption
104What determines the cycle per second developed by the alternator aboard your vessel?
- AThe speed of the engine driving the alternator
- BThe resistance applied to the field rheostat
- CThe synchronous speed of induction
- DThe adjustment made to the voltage regulator
105Which of the following statements identifies the difference between the primary windings and the secondary windings of a 2:1 step down transformer?
- AThe secondary windings have half as many turns as the primary windings
- BThe secondary windings have twice as much resistance as the primary windings
- CThe secondary windings use smaller wires than the primary windings
- DThe secondary windings can only provide half as much current as the primary windings
106What will happen if there is a change in field excitation of an alternator operating in parallel?
- AThere will be a change in voltage output
- BThere will be change in alternator frequency
- CThere will be a change in kilowatt load
- DThere will be a change in current rating
107What is the advantage of DC motors over AC motors?
- AOffer infinite speed variations
- BThey are less expensive
- CThey require less maintenance
- DThey offer slow speed
108A galvanometer is an instrument used to measure ____.
- Avery small amounts of current or voltage
- Bthickness of galvanized metal
- Cresistance of electrical wiring insulation
- Dquantity of galvans in an electric circuit
109Regulations require emergency diesel engine starting systems to have sufficient capacity to provide power for at least ____.
- Asix consecutive cranking cycles
- Bthree continuous starting sequences
- Cnine repeated starts under load
- Dtwelve cranking periods of 5 seconds
110In a three-phase, open-delta connected transformer, the line current is equal to ____.
- Athe phase current
- Bthree times the phase current
- Cthe sum of any two phase currents
- Dthe difference of any two phase currents
111In a running electric motor, why are we using a sound listening bar?
- ATo detect fault in ball bearing
- BTo detect fault in motor windings
- CTo detect fault in stator windings
- DTo detect if motor is overload
112Why is an armature cores in a DC generator made of laminated steel sheets?
- ATo reduce eddy current losses
- BTo fit the curvature of the frame
- CTo increase the hysteresis effect
- DTo allow for easy assembly
113What will be the next step after closing the circuit breaker to place two similar alternators in parallel?
- ATo balance the kilowatt load
- BTo maintain the power factor
- CTo reduce voltage load
- DTo balance ampere load
114What is the reason why one of the generator or motor bearings generally insulated from the end housing?
- ATo preventcirculation of shaft currents induced in the machine’s frame
- BTo prevent excessive field winding heat
- CTo remove current leakage from the shaft
- DTo minimize rapid brush wear
115Why is a modern DC generators fitted with commutating poles?
- ATo reduce sparking
- BTo prevent motorizing
- CReduce spring pressures ion the brushes
- DReduce the load on the main poles
116Why is there an amortisseur windings installed in a synchronous motor?
- ATo dampen any speed fluctuation as a result of load change
- BTo produce a higher power factor
- Cproduce a higher power factor
- Deliminate arcing between the stator and the rotor
117What is the function of the interpoles installed in DC motors?
- ATo limit the production of counter electromotive force
- BTo provide greater torque by strengthening the main field
- CTo limit the starting surge current
118What is the purpose of squirrel-cage windings in a synchronous motor?
- ATo provide a means for starting
- BTo provide more precise balancing
- CTo produce a higher power factor
- DTo eliminate arcing between the stator and the frame
119When energizing a DC propulsion motor using Local override manual control, What should the variable resistor do?
- ATurn to a position which initializes motor rotation and then turn back to the slow position
- BTurn all the way to the full run position then quickly back toslow
- Cquickly to the mid position
- Dquickly to the full run position
120What is an operating characteristic appearing on the name plates of shipboard AC motors?
- ATemperature rise
- Btype of overload protection
- Crated slip
- Dlocked rotor torque
121When mixing electrolyte, which if the following precautions should always be observed?
- AAdd the acid to the water
- BUse a heavy duty aluminum pail
- CAdd the water to the acid
- DMix the solution outdoors
122If the approximate voltage to be measured in an electric circuit is not known, you should _____.
- Ause the highest voltage range on the voltmeter
- BUse the lowest voltage range on the voltmeter
- Cconnect the meter in series with the circuit
- Donly have to calibrate the meter before using it
123The basic operating principle of a transformer is attributed to ___.
- Aelectromagnetic induction
- Bvariance of a conductor in a magnetic fluid
- Cmutual reaction
- Dthermionic emission
124How is kilowatt load divided between two AC generators operating in parallel?
- AAdjusting the governor controls
- BVarying the excitation voltage
- CIncreasing both prime mover speeds simultaneously
- DDecreasing both prime mover speeds simultaneously
125An increase in which of the listed conditions will increase the speed of synchronous electric motor?
- AFrequency
- BVoltage
- CArmature current
- DInductance
126Which of the following meters uses a shunt connected in series with the load, but parallel with the meter movement?
- Aammeter
- Bvoltmeter
- Cpower factor meter
- Dwattmeter
127How is the capacity of a storage battery being measured?
- AAmpere-hours
- BVolts
- CVolt-hours
128A general purpose electrical multimeter can be used to directly measure ____.
- Acurrent
- Bwatts
- Cfield flux
- Dall of the above
129What is the simplest method of controlling the terminal voltage of compound-wound DC generator?
- AWith a hand-operated field rheostat connected in series with the shunt field circuit
- BWith a separate exciter in series with the shunt field
- CWith a balance coil diverting neutral current through the shunt field
- DWith a carbon pile regulator in series with the load
130A ‘dead front’ switchboard is one ____.
- Awith insulated switches and no exposed terminals
- Bwithout switches on it
- Cwithout circuit breakers
- Dwithout safety hand rail nor rubber mats
131When the feeder system has no ground fault, what does the pointer of the insulation resistance indicates
- AInfinity ohm resistance
- BZero ohm resistance
- C500 ohm resistance
- D100 ohm resistance
Informações
- Descrição
- competency Quiz on c05a, created by mrk nthny on 14/08/2016.
- Autor
- mrk nthny
- Idioma
- English
- Visualizações
- 481
- Etiquetas
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