NEW
Font size
Worksheetsاحمد الصامتي
Total questions: 20
Worksheet time: 10mins
1. What are the two categories of A.C motors?
A. Brushless & Brushed
B. Shunt & Series
C. Synchronous & Induction
D. Compound wound & permanent magnet
2. Name the part labelled "A" in the shown picture.
A. Carbon Brushes
B. Filed winding
C. Slip ring
D. Commutator
3. Which type of motor is shown in the below diagram?
A. DC Series motor excited DC
B. DC Compound motor
C. DC Shunt motor
D. Separately motor
4. Which of the following motor uses a centrifugal switch?
A. Split phase induction motor
B. Synchronous motor
C. DC Compound motor
D. DC Shunt motor
5. When does a centrifugal switch operates?
A. at 75 percent of synchronous speed
B. at 50 percent of synchronous speed
C. at 25 percent of synchronous speed
D. at 100 percent of synchronous speed
6. Name the part labelled "B" in the shown picture of
Induction motor.
A. Rotor
B. Stator
C. Bearing
D. Shaft
7. The cover over moving parts of motor is called?
A. Motor shade
B. Motor protection
C. Motor enclosure
D. Motor guard
8. How you name the motor If it is not equipped with any cooling mechanism for enclosing parts?
A. Non ventilated motor
B. Fan cooled motor
C. Fan cooled guarded motor
D. Explosion proof motor
9. Which type of DC Motor is used in cranes, railway applications due to high starting torque demands?
A. Shunt DC Motor
motor
B. Series DC Motor
C. Compound DC Motor
D. Synchronous
10. How do you control the speed of dc motor?
A. By varying applied voltage
B. By varying frequency
C. By varying torque
D. By varying commutator and carbon brush gap
11. Which type of motor is used in fan, washing machine and pump for small home appliances?
A. Three phase induction motor
B. Synchronous motor
C. Shaded pole AC motor
D. Capacitor start single phase induction motor
12. Which type of motor is widely used in industry to run large machinery?
A. single phase induction motor
B. Three phase induction motor
C. Synchronous motor
D. Shaded pole AC motor
13. What is the synchronous speed of 60Hz two pole motor?
A. 3600 rpm
B. 1800 rpm
C. 1200 rpm
D. 900 rpm
14. What is the synchronous speed of 60Hz four pole motor?
A. 3600 rpm
D. 900 rpm
B. 1800 rpm
C. 1200 rpm
15. A four-pole, 208V, 2Hp, 60Hz, three-phase induction motor has a no-load speed of 1,790 rpm, What is the percentage slip for no load condition?
A. 0.655%
B. 0.556%
C. 0.445%
D. 0.455%
16. One Hp (horse power) is equivalent to how much electrical power?
A. 700W
B. 736W
C. 746W
D. 766W
17. Name the part labelled "A" in the shown picture.
A. Commutator
B. Filed winding
C. Slip ring
D. Carbon Brush
18. Which type of motor is shown in the figure?
A. Series Motor
B. Self-excited motor
C. Compound motor
D. Separately excited motor
19. Which kind of magnetic field is produced in three phase induction motor stator winding?
A. Rotating
B. Stationary
C. Linear
D. Random
20. How to give a supply to rotor of wounded rotor induction motor?
A. Through slip ring
B. Through commutator
C. Through mutual induction
D. Through direct connection
