Lucknow Metro Question

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Q1:- The direction of electromagnetically induced current in a circuit placed in varying magnetic field may be found by

1. feleming's left hand rule
2. fleming's right hand rule and lenz's law 
3. joules's law 
4. right hand thumb rule 

ANSWER:- 2

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Q2:- Reactance in p.u. behind the fault point in a power system is 0.5 . the fault MAV in p.u. will be 

1. 2 x 10^3
2. 0.5 x 10 ^6
3. 2 x 10 ^6
4. 2

ANSWER:- 4

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Q3:- In differntia protection of bus bar the CT ratio of the CTs on both side are

1. equal and based on primary current of highest current carrying feeder
2. based on total expected fault current 
3. based on their respective feeder current 
4. equal and based on primary current lowest current carrying feeder

ANSWER:- 1

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Q4:- If the field of synchronous motor is under excited the power will be

1. more than unity 
2. unity 
3. lagging
4. leading 

ANSWER:- 3

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Q5:- If one of the 3- phase of synchronous motor is short ciruited motor will 

1. start 
2. not start
3. over heated 
4. fail to pull into synchronism

ANSWER:- 2 

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