BSNL TTA ONLINE TEST - 1 Basic Electricity -1

Question 1

Question

The 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

Answer

R Ω
2R Ω
4R Ω
8R Ω

Question 2

Question

How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?

Answer

10
60
600
1200

Question 3

Question

Instantaneous power in inductor is proportional to the

Answer

product of the instantaneous current and rate of change of current.
square of instantaneous current.
square of the rate of change of current.
temperature of the inductor.

Question 4

Question

If P is the power of a star connected system then what will be power of an equivalent delta connected system?

Answer

P
3P
P/3
None of the above

Question 5

Question

Power dissipation in ideal inductor is

Answer

Maximum
Minimum
Zero
A finite value

Question 6

Question

Inductor does not allow the sudden change of

Answer

current
voltage
power
None of the above

Question 7

Question

Which of the following has no units?

Answer

Permeability
Moment of a magnet
Magnetic susceptibility
Permittivity

Question 8

Question

Which of the following defined the average value ?

Answer

Voltage
Heating effect
Current
Charge transfer

Question 9

Question

If a pure inductor is connected across the ac source, the average power taken by the inductor is

Answer

A few watt
100 watt
zero watt
Maximum power

Question 10

Question

In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?

Answer

1 μsec
2 msec
2 μsec
4 msec

Question 11

Question

The right hand rule for determining the direction of the induced EMF was introduced by

Answer

Faraday
Lenz
Fleming
Maxwell

Question 12

Question

Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s

Answer

first law
second law
third law
fourth law

Question 13

Question

Which of the following represents ohms law

Answer

V = RI
J = σE
I = GV
All of the above

Question 14

Question

In the left hand rule, forefinger always represents

Answer

voltage.
current.
magnetic field.
direction of force on the conductor.

Question 15

Question

Cork Screw rule is used to find

Answer

direction of current.
direction of magnetic field.
direction of electric field.
direction of emf.

Question 16

Question

Biot-Savarts law states the relation between magnetic intensity and

Answer

filament current only.
surface current only.
volume current only.
(A), (B), and (C) are all correct.

Question 17

Question

The drawback of Daltons atomic structure is that, it says

Answer

the atoms can neither be created nor be destroyed.
unique nature of atom.
most of the volume of an atom is empty space.
none of these.

Question 18

Question

According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

Answer

directly proportional to the square of the distance between them.
inversely proportional to the square of the distance between them.
inversely proportional to the distance between them.
directly proportional to the distance between them.

Question 19

Question

Ohm’s law in point from field theory can be expressed as

Answer

J = σE.
V = IR.
J = E / σ.
R = ρ × ( l / A).

Question 20

Question

Coulombs law for the force between electric charges most closely resembles with

Answer

Newtons law of motion.
Law of conservation of energy.
Gausss theorem.
Newtons law of gravitation.

Question 21

Question

The Biot-savarts law is a general modification of

Answer

Kirchhoffs law.
Lenzs law.
Amperes law.
Faradays law.

Question 22

Question

The direction of induced emf can be found by

Answer

Laplaces law.
Kirchhoffs voltage law.
Lenzs law.
Flemings right hand rule.

Question 23

Question

Conductor is constant and field is varying then emf will induce. This principle is called

Answer

virtually induced emf.
dynamically induced emf.
static induced emf.
none of the above.

Question 24

Question

The operation of electric generators and motors depend on the intraction between magnetic field and

Answer

Commutator.
Electric current.
Copper conductors.
Electric fields.

Question 25

Question

The heating time constant of an electrical machine gives an induction of its

Answer

rating.
cooling.
overload capacity.
short time rating.

Question 26

Question

Flemings left hand rule may be applied to an electric generator to find out the direction of

Answer

induced emf.
rotor rotation.
magnetic field.
none of the above.

Question 27

Question

Nodal analysis can be applied for

Answer

planar networks.
non planar networks.
both planner and non planner networks.
neither planner nor non planner networks.

Question 28

Question

KCL works on the principle of which of the following

Answer

Law of conservation of charge
Law of conservation of energy
Both
None of the above

Question 29

Question

KVL works on the principle of

Answer

Law of conservation of charge
Law of conservation of energy
Both
None of the above

Question 30

Question

Form factor is equal to Peak factor in case of

Answer

Square wave
Triangle wave
Saw tooth wave
All of the above

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BSNL TTA ONLINE TEST - 1 Basic Electricity -1

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Resource summary

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30

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