UPPCL Questions

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Q1:-A moving coil of a meter has 400 turns and a length and depth of 20 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a full scale current of 25 mA. The torque on the coil is ____________________ and sensistivity is _____________________ 

1.800 μNm , 40 Ω/V 
2.800 μNm ,25 Ω/V 
3.200 μNm ,100 Ω/V 
4.800 μNm,1 Ω/V 

ANSWER:-1

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Q2:-In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is:-

1.400 Hz

2.600 Hz

3.1200 Hz

4.800 Hz

ANSWER:-3

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Q3:-The measurement range of an voltmeter can be increased by using a ________.

1.High resistance in shunt 
2.Low resistance in shunt
3.High resistance in series
4.Low resistance in series 

ANSWER:-3

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Q4:-Two single-phase transformers A and B with equal turn ratio have reactances of j3 Ω and j9 Ω referred to secondary. When operated in parallel, the load-sharing of 200 kW at 0.8 pf lag between A and B transformers would respectively be:-

1.75 kW and 25 kW
2.100kW and 100 kW
3.150 kW and 50kW
4.120 kW and 80 kW 

ANSWER:-3

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Q5:-Surge impedance loading of a transmission line can be increased by:-

1. Decreasing its voltage level
2. Reducing the length of the line

Only 2 is correct 
Only 1 is correct 
Both 1 & 2 is correct 
Both 1 & 2 is incorrect 

ANSWER:-Only 2 is correct 

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