d.c. series motor
shaded pole motor
capacitor-start capacitor-run motor
reluctance motor
Answer is Right!
Answer is Wrong!
Single phase induction motors
2. The speed control of universal motor used for sewing machines is by
friction
varying the resistance
tapping the field
centrifugal mechanism
Answer is Right!
Answer is Wrong!
Detailed SolutionThe speed control of universal motor used for sewing machines is by
3. The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be
At the end connections
At the end terminals
Anywhere on the winding inside a slot
At the slot edge where coil enters or comes out of the slot
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Answer is Wrong!
4. In split-phase motor auxiliary winding is of
thick wire placed at the bottom of the slots
thick wire placed at the top of the slots
thin wire placed at the top of the slots
thin wire placed at the bottom of the slots
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Answer is Wrong!
Detailed SolutionIn split-phase motor auxiliary winding is of
5. In a single phase motor the centrifugal switch
disconnects auxiliary winding of the motor
disconnects main winding of the motor
reconnects the main winding the motor
reconnects the auxiliary winding of the motor
Answer is Right!
Answer is Wrong!
Detailed SolutionIn a single phase motor the centrifugal switch
6. A repulsion motor is equipped with
slip rings
commutator
both (A) and (B)
none of the above
Answer is Right!
Answer is Wrong!
7. A schrage motor can run on
zero slip
negative slip
positive slip
all of the above
Answer is Right!
Answer is Wrong!
8. The speed of a universal motor is usually reduced by using
gearing
belts
brakes
chains
Answer is Right!
Answer is Wrong!
Detailed SolutionThe speed of a universal motor is usually reduced by using
9. If a D.C. series motor is operated on
spark excessively
have poor efficiency
series motor is operated on A.C. supply, it will A. spark excessively B. have poor efficiency C. have poor power factor
all of the above
Answer is Right!
Answer is Wrong!
10. Single phase induction motor usually operates on
0.6 power factor lagging
0.8 power factor lagging
0.8 power factor leading
unity power factor
Answer is Right!
Answer is Wrong!
Detailed SolutionSingle phase induction motor usually operates on