Single Phase Motors Part 3
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Attempt Free Single Phase Motors Part 3 Here. Read The Important Electrical MCQ From Below.
Instructions: Click the answer button to see the correct answer.
Ques. In case of single phase motors, pulsating flux is set up instead of revolving field as in 3-phase motors.
- true
- false
Answer: a
Ques. In split-phase induction motors, two windings are provided.
- true
- In case of single phase motors, pulsating flux is set up instead of revolving field as in 3-phase motors.
- false
Answer: b
Single Phase Motors Part 3
Ques. In split-phase induction motors, two windings arc connected in parallel.
- true
- false
Answer: a
Ques. In split-phase induction motor, both the windings arc connected during starling.
- false
- true
Answer: a
Ques. A shaded pole motor has laminated salient poles.
- true
- false
Answer: a
Ques. In shaded pole motors, the winding is provided on poles.
- false
- true
Answer: b
Single Phase Motors Part 3
Ques. A universal motor can be operated on single phase or three phase supply.
- true
- false
Answer: b
Ques. Normally the direction of rotation of a shaded pole motor cannot be reversed.
- false
- true
Answer: b
Ques. The starting torque of a single phase motor can be improved by connecting a capacitor in series with the starting winding.
- true
- false
Answer: a
Ques. In capacitor motors paper capacitor is used.
- true
- false
Answer: a
Single Phase Motors Part 3
Ques. Shaded pole type motor has leading power factor.
- false
- true
Answer: a
Ques. The electrical connection between stator and rotor is through a condenser.
- true
- false
Answer: a
Ques. Starting winding is provided on single phase motor to make it self-starting.
- true
- false
Answer: a
Ques. In a capacitor motor the capacitance helps in splitting single phase into two phase supply.
- true
- false
Answer: a
Single Phase Motors Part 3
Ques. A shaded pole motor is the only single phase motor which is inherently self-starting.
- false
- true
Answer: b
Ques. In a mixer-grinder, universal motor is used.
- false
- true
Answer: b
Ques. The principle of operation of a single phase induction motor depends upon rotating magnetic fields.
- false
- true
Answer: b
Ques. A repulsion motor is fitted with a commutator.
- false
- true
Answer: b
Single Phase Motors Part 3
Ques. A repulsion motor receives its armature current by induction.
- false
- true
Answer: b
Ques. A repulsion motor can be directly switched on line.
- true
- false
Answer: a
Ques. The rotor of a hysteresis motor is made of cast iron.
- true
- false
Answer: b
Single Phase Motors Part 3
Ques. The disadvantage of hysteresis motor is sparking at brushes.
- true
- false
Answer: a
Ques. A single phase motor may become hot due to high voltage, short circuit or over-load.
- true
- false
Answer: a
Ques. A hysteresis motor works on the principle of continuously revolving magnetic flux.
- false
- true
Answer: b
Ques. A single phase capacitor start and ran motor is virtually a two phase induction motor.
- false
- true
Answer: b
Single Phase Motors Part 3
Ques. A universal motor when operated on dc or ac supply at same speed produces different outputs.
- true
- false
Answer: b
Ques. In repulsion motors the power factor is high.
- true
- false
Answer: b
Ques. A short circuit is used in repulsion start induction run motor.
- false
- true
Answer: b
Ques. A shaded pole motor has low initial cost.
- false
- true
Answer: b
Ques. Universal motors are invariably fitted with a cooling fan.
- false
- true
Answer: b
Single Phase Motors Part 3
Ques. Large universal motors are usually directly coupled to load.
- true
- false
Answer: a
Ques. Single, turn coil is used in the armature of single phase ac series motors to ,facilitate commutation and avoid sparking at the brushes.
- false
- true
Answer: b
Ques. In conductively compensated ac series motor the compensating winding is connected in parallel with the armature.
- false
- true
Answer: a
Ques. The resultant flux of a two phase induction motor is constant.
- true
- false
Answer: a
Ques. In repulsion motors the speed is a function of load.
- true
- false
Answer: a
Single Phase Motors Part 3
Ques. For domestic applications single phase motors are preferred.
- false
- true
Answer: b
Ques. For cleaning motor winding it should be washed with water and soap solution.
- false
- true
Answer: a
Ques. In reluctance motor the torque is produced due to hysteresis loss.
- false
- true
Answer: b
Ques. In inductively compensated ac series motor, the current is proportional to armature current at a phase angle of 90°.
- false
- true
Answer: a
Ques. In repulsion motors, no load speed is dangerously high.
- fals
- true
Answer: b
Single Phase Motors Part 3
