Test
BSNL TTA ONLINE TEST - 1 Basic Electricity -1
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Preguntas del test (30)
1The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
- AR Ω
- B2R Ω
- C4R Ω
- D8R Ω
2How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
- A10
- B60
- C600
- D1200
3Instantaneous power in inductor is proportional to the
- Aproduct of the instantaneous current and rate of change of current.
- Bsquare of instantaneous current.
- Csquare of the rate of change of current.
- Dtemperature of the inductor.
4If P is the power of a star connected system then what will be power of an equivalent delta connected system?
- AP
- B3P
- CP/3
- DNone of the above
5Power dissipation in ideal inductor is
- AMaximum
- BMinimum
- CZero
- DA finite value
6Inductor does not allow the sudden change of
- Acurrent
- Bvoltage
- Cpower
- DNone of the above
7Which of the following has no units?
- APermeability
- BMoment of a magnet
- CMagnetic susceptibility
- DPermittivity
8Which of the following defined the average value ?
- AVoltage
- BHeating effect
- CCurrent
- DCharge transfer
9 If a pure inductor is connected across the ac source, the average power taken by the inductor is
- AA few watt
- B100 watt
- Czero watt
- DMaximum power
10In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?
- A1 μsec
- B2 msec
- C2 μsec
- D4 msec
11The right hand rule for determining the direction of the induced EMF was introduced by
- AFaraday
- BLenz
- CFleming
- DMaxwell
12Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
- Afirst law
- Bsecond law
- Cthird law
- Dfourth law
13Which of the following represents ohms law
- AV = RI
- BJ = σE
- CI = GV
- DAll of the above
14In the left hand rule, forefinger always represents
- Avoltage.
- Bcurrent.
- Cmagnetic field.
- Ddirection of force on the conductor.
15Cork Screw rule is used to find
- Adirection of current.
- Bdirection of magnetic field.
- Cdirection of electric field.
- Ddirection of emf.
16Biot-Savarts law states the relation between magnetic intensity and
- Afilament current only.
- Bsurface current only.
- Cvolume current only.
- D(A), (B), and (C) are all correct.
17The drawback of Daltons atomic structure is that, it says
- Athe atoms can neither be created nor be destroyed.
- Bunique nature of atom.
- Cmost of the volume of an atom is empty space.
- Dnone of these.
18According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is
- Adirectly proportional to the square of the distance between them.
- Binversely proportional to the square of the distance between them.
- Cinversely proportional to the distance between them.
- Ddirectly proportional to the distance between them.
19 Ohm’s law in point from field theory can be expressed as
- AJ = σE.
- BV = IR.
- CJ = E / σ.
- DR = ρ × ( l / A).
20Coulombs law for the force between electric charges most closely resembles with
- ANewtons law of motion.
- BLaw of conservation of energy.
- CGausss theorem.
- DNewtons law of gravitation.
21The Biot-savarts law is a general modification of
- AKirchhoffs law.
- BLenzs law.
- CAmperes law.
- DFaradays law.
22The direction of induced emf can be found by
- ALaplaces law.
- BKirchhoffs voltage law.
- CLenzs law.
- DFlemings right hand rule.
23Conductor is constant and field is varying then emf will induce. This principle is called
- Avirtually induced emf.
- Bdynamically induced emf.
- Cstatic induced emf.
- Dnone of the above.
24The operation of electric generators and motors depend on the intraction between magnetic field and
- ACommutator.
- BElectric current.
- CCopper conductors.
- DElectric fields.
25The heating time constant of an electrical machine gives an induction of its
- Arating.
- Bcooling.
- Coverload capacity.
- Dshort time rating.
26Flemings left hand rule may be applied to an electric generator to find out the direction of
- Ainduced emf.
- Brotor rotation.
- Cmagnetic field.
- Dnone of the above.
27Nodal analysis can be applied for
- Aplanar networks.
- Bnon planar networks.
- Cboth planner and non planner networks.
- Dneither planner nor non planner networks.
28KCL works on the principle of which of the following
- ALaw of conservation of charge
- BLaw of conservation of energy
- CBoth
- DNone of the above
29KVL works on the principle of
- ALaw of conservation of charge
- BLaw of conservation of energy
- CBoth
- DNone of the above
30Form factor is equal to Peak factor in case of
- ASquare wave
- BTriangle wave
- CSaw tooth wave
- DAll of the above
Información
- Descripción
- Subject : Basic Electricity Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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