Junior Engg. Paper Set

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Q1:- In a 3- phase system the volt ampere rating is given by ?

1. root 3 (line voltage)(line current)
2. (phase voltage )(phase current)
3. 3. (line voltage)(line current)
4. (line voltage)(line current)

ANSWER:-1

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Q2:- The aluminium conductor of size is used for a subcircuit in domestic wiring.

1. 1/2.24 mm
2. 1/1.2 mm
3. 1/1.8 mm
4. 1/1.4 mm

ANSWER:-4

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Q3:-The area of hysteresis loop will be least for one of the following materials . it is ?

1. silicon steel
2. soft iron
3. hard steel
4. wrought iron

ANSWER:-1

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Q4:- For cleat wiring and 250 volts supply the cables will be placed a part centre to centre for single core cables

1. 4 cm
2. 3 cm
3. 4.5 cm
4. 2.5 cm

ANSWER:-4

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Q5:- The errors in current transformer can be reduced by designing them with

1. using primary and secondary as close to each other as possible
2. all of the given option
3. high permeability and how loss core materials avoiding any joints in the core and also keeping the flux density to a low value
4. using large cross section for both primary and secondary winding conductors

ANSWER:-3

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Q6:- An amplifier has a gain of 10,000 expressed in decibels the gain is 

1. 40
2. 10
3. 80
4. 100

ANSWER:-3

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Q7:- Creeping in a singe phase induction type energy meter may be due to ?

1. vibrations
2. over voltage
3. all
4. over compensation for friction

ANSWER:-3

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Q8:-Modern electronics multimeters measure resistance by?

1. forcing a constant current and measuring the voltage across the unknown resistance
2. using a electrical bridge circuit
3. using an electronic bridge compensator for melling 
4. using a bridge cicuit

ANSWER:-1

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Q9:-  There are 3 lamps 40 W , 100 W , and 60 W . to realise the full rated power the lamps they are to be connected in 

1. series only
2. series or parallel
3. parallel only
4. series- parallel

ANSWER:-3

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Q10:-Locked rotor current of a shaded pole motor is 

1. slightly more than full load current 
2. equal to full load current 
3. several times the full load current 
4. less than full load current

ANSWER:-1

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