| 1. | The speed of a D.C. motor can be varied by varying ? | |
|
field current
|
||
|
applied voltage
|
||
|
resistance in series with armature
|
||
|
any of the above
|
||
View Answer
Discuss in Forum
Report Question| 2. | In a manual shunt motor starter ? | |
|
over load relay is connected in series and no volt relay in parallel with the load
|
||
|
over load relay is connected in parallel and no volt relay in series with the load
|
||
|
over load relay and no volt relay are both connected in series with the load
|
||
|
over load relay and no volt relay are both connected in parallel with the load
|
||
| 3. | One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven ? | |
|
runs as a generator
|
||
|
does not run as a generator
|
||
|
also runs as a motor
|
||
|
comes to stop after sometime
|
||
| 4. | A series motor is started without load. The effect is that ? | |
|
the back e.m.f. decreases
|
||
|
the torque increases rapidly
|
||
|
the speed increases rapidly
|
||
|
the current drawn increases rapidly
|
||
| 5. | The variable resistor shunting the field of a D.C series motor is called a ? | |
|
armature divider
|
||
|
voltage regulator
|
||
|
field divertor
|
||
|
potential divider
|
||
| 6. | A D.C motor can be easily identified by ? | |
|
winding
|
||
|
commutator
|
||
|
size of conductor
|
||
|
yoke
|
||
| 7. | In regenerative braking ? | |
|
motor energy is dissipated as heat
|
||
|
motor energy is dissipated in armature heating
|
||
|
motor energy is dissipated in windage losses
|
||
|
motor is made to run as a generator
|
||
| 8. | The losses occurring in a DC generator are given below, Which loss is likely to have highest proportion at rated load of the generator ? | |
|
hysteresis loss
|
||
|
field copper loss
|
||
|
armature copper loss
|
||
|
eddy current loss
|
||
| 9. | Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be ? | |
|
level compounded
|
||
|
under compounded
|
||
|
cumulatively compounded
|
||
|
differentially compounded
|
||
| 10. | Which of the following load normally, needs starting torque more than. The rated torque ? | |
|
Blowers
|
||
|
Conveyors
|
||
|
Air compressors
|
||
|
Centrifugal pumps
|
||