T10 QUIZ Phase-8 (1-phase I.M.)

Q1:- An outstanding feature of a universal motor is its 

1. highest horsepower per pound ratio
2. sow speed
3. poor performance on D.C.
4. best performance on 60 Hz power

ANSWER:-1

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Q2:- Under no load conditions a universal motor tends to run away; its speed is limited only by 

1. the supply frequency
2. the number of field poles
3. winding and friction
4. commutation

ANSWER:-3

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Q3:- The recommended brush pressure to use in a universal motor is 

1. 0.5 to 1.0 psi
2. 1.0 to 1.5 psi
3. 1.5 to 2.5 psi 
4. 2.5 to 3.5 psi

ANSWER:-3

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Q4:- Which of the following is common cause of brush sparking in a universal motor ?

1. short armature winding
2. open armature winding
3. high commutator mica
4. all of the above

ANSWER:-4

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Q5:- The most common mechanical method of providing speed reduction for universal motors is to use

1. gearing 
2. brakes
3. chains
4. belts

ANSWER:-1

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Q6:- The rotor slots in an induction motor are usually not kept parallel to the shaft as it ?

1. helps the rotor teeth to remain under the stator teeth.
2. helps in reducing the tendency of the rotor teeth to remain under the stator teeth
3. improve pf
4. improve efficiency

ANSWER:-2

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Q7:-A 1-phase I.M. is 

1. self starting
2. not self starting
3. self starting with the hep of auxiliary winding
4. none

ANSWER:-3

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Q8:- In case of split phase motor the phase shift between currents in the two winding is around 

1. 30 degree
2. 70
3. 90
4. 120

ANSWER:-1

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Q9:- Early break down of winding insulation can be caused by 

1. low brush pressure
2. dust ,oil,or other contaminants
3. high commutator mica
4. all

ANSWER:-2

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Q10:-A rotating magnetic field in a shaded -pole motor is produced by using

1. salient poles
2. shading coils
3. a capacitor
4. a high inductance winding

ANSWER:-2

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