Top 150+ Solved Electrical Drives and Controls (EDC) MCQ Questions Answer
Q. In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will
a. increase
b. decrease
c. remain unchanged
d. first increases then decrease
Q. In the rotor voltage injection method, when an external voltage source is in opposite phase with the main voltage then speed will
a. increase
b. decrease
c. remain unchanged
d. first increases then decrease
Q. A single-phase half wave voltage controller consists of
a. one scr is parallel with one diode
b. one scr is anti parallel with one diode
c. two scrs in parallel
d. two scrs in anti parallel
Q. In the below given voltage controller circuit
a. the positive half cycle at the load is same as the supply vs
b. the negative half cycle at the load is same as the supply vs
c. the positive and negative half cycles at the load are identical to the supply
d. none of the mentioned
Q. The below shown controller circuit is a
a. half wave controller
b. full wave controller
c. none of the mentioned
d. will depend upon the firing angle
Q. The below given controller circuit is a
a. half wave controller
b. full wave controller
c. none of the mentioned
d. will depend upon the firing angle
Q. In the below given voltage controller circuit
a. only the negative cycle can be controlled
b. only the positive cycle can be controlled
c. both the cycles can be controlled
d. none of the mentioned
Q. to protect them from dust and contamination.
a. enclosures
b. open environment
c. moisturizing environment
d. hot environment
Q. voltage of a dc machine is a function of its magneto-motive force.
a. non-linear
b. linear
c. constant
d. inverse
Q. compound dc motor is shown below. What conclusions can be made?
a. this is an unstable machine
b. there is regenerative increment in the speed
c. this is impractical to be used
d. all of the mentioned
Q. Which of the following is dynamic braking?
a. reversal of field connections
b. reversal of armature connections
c. addition of equal and opposite field
d. removal of armature circuit from current machine circuit
Q. Braking time in the dynamic braking is the function of
a. system inertia
b. load torque
c. motor rating
d. all- system inertia, load torque and motor rating