Electrical Engineering Multiple Choice Questions
1- If the frequency is more than the resonance frequency, then a series RLC circuit will be
A:- Inductive
B:- Capacitive
C:- Resistive
D:- Can be inductive or capacitive
2- If an impedance is connected across a voltage source V with a source impedance of Z, then for maximum power transfer the load impedance must be equal to
A:- Real part of Z
B:- Half of Z
C:- Source impedance Z
D:- Complex conjugate of Z
3- Out of the following materials, the area of the hysteresis loop will be least for
A:- wrought iron
B:- hard steel
C:- silicon steel
D:- soft iron
4- Reciprocal of reluctance is
A:- Susceptance
B:- Susceptibility
C:- Permeance
D:- Permeability
5- According to Lenz’s law the induced EMF opposes the
A:- Flux
B:- Change in Flux
C:- Both Flux and change in flux
D:- None of the above
6- The conductor is stationary and the magnetic field linked with it is varying. Then the EMF induced in the conductor is known as
A:- Statically induced EMF
B:- Dynamically induced EMF
C:- Self-induced EMF
D:- Back EMF
7- Which among the following is true about Faraday’s law of Electromagnetic induction?
A:- An EMF is induced in a conductor when the flux linked with it is constant
B:- An EMF is induced in a conductor when it moves parallel to the magnetic field
C:- An EMF is induced in a conductor when no flux is linked with it
D:- An EMF is induced in a conductor when the flux linked with it is varying
8- Relative permeability of free space is
A:- 1
B:- 10
C:- 100
D:- 1000
9- The condition for maximum efficiency of a DC Machine
A:- Core loss = Copper loss
B:- Constant loss = Variable loss
C:- Rotational losses = Copper loss
D:- Core loss = Half of Copper loss
10- The power factor of a synchronous motor
A:- is always lagging
B:- is always leading
C:- can be leading, lagging, or unity
D:- can be unity and lagging
11- In lap winding, the number of brushes is always
A:- double the number of poles
B:- same as the number of poles
C:- half the number of poles
D:- two
12- The purpose of providing dummy coils in a generator is
A:- to reduce eddy current losses
B:- to enhance flux density
C:- to amplify voltage
D:- to provide mechanical balance for the rotor
ANSWERS:
1-(A), 2-(D), 3-(C), 4-(C), 5-(B), 6-(A), 7-(D), 8-(A), 9-(B), 10-(C), 11-(B), 12-(D)