SSC Jr. Engg. Questions

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Q1:- Motor used for elevators is generally 

1. sysnchronous motor
2. induction motor
3. capacitor start single phase induction motor 
4. any of these

ANSWER:-2

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Q2:- In case of contactors the contacts are generally made of 

1. copper
2. silver
3. cadmium copper 
4. any of these

ANSWER:-4

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Q3:- Which electromagnet is preferred for noiseless operation ?

1. DC operated 
2. AC operated 
3. any of these 
4. none of the above

ANSWER:-1

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Q4:-Long distance railways use 

1. 220 v DC
2. 25 kv , single phase AC
3. 25 kv ,  two phase - AC
4. 25 kv , three phase - AC

ANSWER:-2

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Q5:- Suburban railways use 

1. 1500 v , DC
2. 440 v three phase AC
3. 660 v three phase AC
4. 3.3 v three phase AC

ANSWER:-1

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