| 1. | A simple method of increasing the voltage of a DC generator is ? | |
|
to decrease the air gap flux density
|
||
|
to increase the speed of rotation
|
||
|
to decrease the speed of rotation
|
||
|
to increase the length of the armature
|
||
View Answer
Discuss in Forum
Report Question| 2. | An three induction motor is similar to ? | |
|
transformer secondary short circuit
|
||
|
transformer secondary open circuit
|
||
|
dc motor with load
|
||
|
dc motor without load
|
||
| 3. | A single phase Hysteresis motor ? | |
|
can run at synchronous speed only
|
||
|
can run at sub synchronous speed only
|
||
|
can run at synchronous and super synchronous speed
|
||
|
can run at synchronous and sub synchronous speed
|
||
| 4. | Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because ? | |
|
it is comparatively cheaper
|
||
|
it has almost non-destructible capacitor
|
||
|
it has low starting as well as running currents at relatively high power factor
|
||
|
it is quiet in operation
|
||
| 5. | For which of the applications a reluctance motor is preferred ? | |
|
Electric shavers
|
||
|
Refrigerators
|
||
|
Signalling and timing devices
|
||
|
Lifts and hoists
|
||
| 6. | If the capacitor of a single-phase motor is short-circuited ? | |
|
the motor will not start
|
||
|
the motor will run
|
||
|
the motor will run in reverse direction
|
||
|
the motor will run in the same direction at reduced r.p.m.
|
||
| 7. | Which of the following single-phase induction motors is generally used in time phonographs ? | |
|
Resistance start
|
||
|
Capacitor start capacitor run
|
||
|
Shaded pole
|
||
|
Universal
|
||
| 8. | In a capacitor start motor, the phase displacement between starting and running winding can be nearly ? | |
|
10°
|
||
|
30°
|
||
|
60°
|
||
|
90°
|
||
| 9. | A transmission line consists of which of the following distributed constants ? | |
|
Resistance and inductance
|
||
|
Inductance and shunt capacitance
|
||
|
Resistance and series capacitance
|
||
|
Resistance, inductance, series and shunt capacitance
|
||
| 10. | Branch circuit must not feed more than ........... points ? | |
|
12
|
||
|
5
|
||
|
10
|
||
|
8
|
||