BSNL TTA Questions

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Q1:- The per phase D.C. armature resistance of an alternator is 0.5 ohm. The effective a.c. armature resistance resistance  would be about ?

1. 1 ohm
2. 0.25 ohm 
3. 0.5 ohm
4. 0.75 ohm 

ANSWER:- 4

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Q2:- When a source is delivering maximum power to the load the efficiency will be 

1. below 50%
2. 50%
3. maximum
4. above 50 %

ANSWER:- 2

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Q3:- When a series RL circuit is connected to a voltage source V at t=0, the current passing through the inductor L at t=0+ is 

1. V/L
2. V/R
3. infinite
4. zero

ANSWER:- 4

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Q4:- A node in a circuit is define as a 

1. closed path 
2. junction of two or one more 
3. group of interconnected 
4. open terminal of an

ANSWER:- 2

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Q5:- Leakage flux in a transformer occurs because 

1. transformer is not an efficient device 
2. iron core has high permeability 
3. applied voltage is sinusoidal 
4. air is not a good magnetic insulator 

ANSWER:- 2

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