| 1. | Which of the following motors will operate at high power factor ? | |
|
Shaped pole motor
|
||
|
Split phase motor
|
||
|
Capacitor start motor
|
||
|
Capacitor run motor
|
||
View Answer
Discuss in Forum
Report Question| 2. | The power factor of a single-phase induction motor is usually ? | |
|
lagging
|
||
|
always leading
|
||
|
unity
|
||
|
unity to 0.8 leading
|
||
| 3. | In a capacitor start motor, the phase displacement between starting and running winding can be nearly ? | |
|
10°
|
||
|
30º
|
||
|
60º
|
||
|
90º
|
||
| 4. | In a capacitor start motor, the phase displacement between starting and running winding can be nearly ? | |
|
10°
|
||
|
30º
|
||
|
60º
|
||
|
90º
|
||
| 5. | Hysteresis motor is particularly useful for high-quality record players and tape-recorders because ? | |
|
it revolves synchronously
|
||
|
it is not subject to any magnetic or mechanical vibrations
|
||
|
it can be easily manufactured in extremely small sizes of upto 1 W output
|
||
|
it develops hysteresis torque which is extremely steady both in amplitude and phase
|
||
| 6. | In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will ? | |
|
become unstable
|
||
|
draw excessive armature current and may burn out
|
||
|
fall out of synchronism and come to stand still
|
||
|
Run as induction motor
|
||
| 7. | The power factor of a single-phase induction motor is usually ? | |
|
lagging
|
||
|
always leading
|
||
|
unity
|
||
|
unity to 0.8 leading
|
||
| 8. | The power factor of a single-phase induction motor is usually ? | |
|
lagging
|
||
|
always leading
|
||
|
unity
|
||
|
unity to 0.8 leading
|
||
| 9. | Which of the following motor will have relatively higher power factor ? | |
|
Capacitor run motor
|
||
|
Shaded pole motor
|
||
|
Capacitor start motor
|
||
|
Split phase motor
|
||
| 10. | If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ? | |
|
Universal motor
|
||
|
Shaded pole type motor
|
||
|
Capacitor start motor
|
||
|
Capacitor start and run motor
|
||