Electrical Engineering Multiple Choice Questions

MCQ on Electrical engineering

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)