MCQ on Electrical Engineering

MCQ on Electrical Engineering

1- For the load flow solution the quantities specified at slack bus are:

(A) P and Q.

(B) P and V.

(C) Q and V.

(D) ˡVˡ and δ.

 

2- In SVC devices:

(A) voltage injected into the system depends upon the system current.

(B) current injected into the system depends upon the system voltage.

(C) current is made perpendicular to the system voltage.

(D) voltage is made perpendicular to the system current.

 

3- Field current control method is used for DC motors to achieve :

(A) Speed above normal speed

(B) Speed below normal speed

(C) Constant speed

(D) Speed above and below normal speed

 

4- The synchronous phasor is a:

(A) GPS based phase measurement unit device.

(B) surge protection device.

(C) voltage regulator device.

(D) tie-line power regulator.

 

5- The power factor of a synchronous motor can be made leading by adjusting:

(A) Speed

(B) Excitation.

(C) Supply voltage.

(D) Supply frequency.

 

6- The alternative magnetic flux in a conductor caused due to the current flowing in a neighboring conductor gives rise to circulating currents which cause an apparent increase in the resistance of conductor. This phenomenon is called:

(A) Skin effect.

(B) Ferranti effect.

(C) Ampere’s circuital law.

(D) Proximity effect.

 

7- For controlling the speed of a three phase Induction motor, the scheme generally used is the:

(A) Fixed voltage and fixed frequency scheme.

(B) Variable voltage and fixed frequency.

(C) Variable voltage and variable frequency.

(D) Fixed voltage and variable frequency scheme.

 

8- The Thevenin and Norton equivalent of a network can be found:

(A) If it contains voltage source only.

(B) If it contains current source only.

(C) If it contains independent voltage and current sources.

(D) Even if it contains dependent and independent voltage and current sources.

 

9- Three point starter is used for starting the:

(A) DC Series motor.

(B) DC Shunt motor.

(C) Compound DC motor.

(D) FHP motor.

 

10- The flux paths close and around the air gap have lengths comparable to the path directly underneath the core faces of air gap. This results that the flux tends to spread somewhat outside the air gap. This is called:

(A) Leakage factor.

(B) Magnetostriction.

(C) Fringing.

(D) Eddy current flux.

 

ANSWERS:

1-(D), 2-(A), 3-(A), 4-(A), 5-(B), 6-(D), 7-(C), 8-(D), 9-(B), 10-(C)