# Commissioning of single phase motors special motors - Electrical Engineering (MCQ) questions and answers

1)   At what angle difference is the main winding and the start winding separated in a spilt phase capacitor start induction motor?

a. 45° electrical
b. 90° electrical
c. 45° mechanical
d. 90° mechanical
 Answer  Explanation ANSWER: 90° electrical Explanation: No explanation is available for this question!

2)   Which among these is the application of universal motors?

a. Vacuum cleaners
b. Fans
c. Hair dryers
d. Washing machines
 Answer  Explanation ANSWER: Vacuum cleaners Explanation: No explanation is available for this question!

3)   What is the typical value of the capacitor used in ‘capacitor start capacitor run’ induction motor?

a. 5 μ F
b. 40 μ F
c. 300 μ F
d. 1000 μ F
 Answer  Explanation ANSWER: 300 μ F Explanation: No explanation is available for this question!

4)   What is the value of the permanently connected capacitor in capacitor start capacitor run induction motor?

a. 40 μ F
b. 5 μ F
c. 300 μ F
d. 1000 μ F
 Answer  Explanation ANSWER: 40 μ F Explanation: No explanation is available for this question!

5)   At what percentage of the rated speed is the starting winding of a capacitor start induction disconnected with the help of a centrifugal switch?

a. 50 % of the rated speed
b. 70 % of the rated speed
c. 25 % of the rated speed
d. 5 % of the rated speed
 Answer  Explanation ANSWER: 70 % of the rated speed Explanation: No explanation is available for this question!

6)   What is the speed range of poly phase Commutator motors?

a. 0.5 Ns to 1 Ns
b. 0.5 Ns to 1.5 Ns
c. 0.1 Ns to 2 Ns
d. 0.5 Ns to 2.5 Ns
 Answer  Explanation ANSWER: 0.5 Ns to 1.5 Ns Explanation: No explanation is available for this question!

7)   Which among these is an application of single phase synchronous AC motor?

a. Small drill
b. Large drill
c. Dishwasher
d. Sewing machine
 Answer  Explanation ANSWER: Dishwasher Explanation: No explanation is available for this question!

8)   Which method is used for obtaining starting torque in a single phase induction motor?

a. Resistance split phase starting
b. Capacitor start capacitor run
c. Permanent split capacitor motor
d. Only a and c
e. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

9)   Which type of rotor is used for single phase induction motor?

a. Wound rotor
b. Squirrel cage rotor
c. Both (A) & (B)
d. None of these
 Answer  Explanation ANSWER: Squirrel cage rotor Explanation: No explanation is available for this question!

10)   Which among these are the types of single phase AC motors?

i. Induction