BSNL TTA Question

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Q1:- A synchro- transmitter sends an electrical signal to the 

1. synchro receiver 
2. motor field
3. motor starter 
4. synchro generator 

ANSWER:- 1

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Q2:- The direction of rotation of a hysteresis motor is determined by the 

1. hysteresis loss 
2. magnetic retentivity of the rotor
3. position of the shaded pole with respect to the main pole 
4. magentic permeability of the stator 

ANSWER:- 3

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Q3:- Running overload protection in a manual starting switch is provided by a 

1. dual element fuse
2. toggle switch 
3. thermal activated device 
4. snap action mechanism

ANSWER:- 3

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Q4:- A singe phase motor is 

1. self starting 
2. not self starting 
3. self starting with the help of auxiliary winding
4. self starting with the help of capacitor in series.

ANSWER:- 3

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Q5:- Motor and controller frames must be grounded to 

1. prevent a potential above ground 
2. have a common return path 
3. eliminate a grounding conductor 
4. isolate the motor from overcurrents 

ANSWER:- 1

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