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
Question 2
Question
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
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
Question 15
Question
Cork Screw rule is used to find
Question 16
Question
BiotSavarts law states the relation between magnetic intensity and
Question 17
Question
The drawback of Daltons atomic structure is that, it says
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
Question 21
Question
The Biotsavarts 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
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
Question 28
Question
KCL works on the principle of which of the following
Question 29
Question
KVL works on the principle of
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