Tag Archives: PSU Sample Question Papers

PSU Sample Paper 2

 
1. Three 100W non-inductive resistors, when connected in star across 400 V, 50 Hz, 3 phase consumes 1600 W.  When one of the resistances becomes open, the power consumption is reduced by:

a)         half                  b)         one third          c)         two third          d)         one fourth

2. The power input to a three phase induction motor is 62 kW.  The stator loss is 2 kW.  If the rotor is running with a slip of 5%, the total copper loss in the rotor will be:

a)         500 W              b)         1000 W            c)         1500 W            d)         3000 W

3. A transformer has an iron loss of 250 W and full-load copper loss of 1000 W.  At what percentage of full-load, the efficiency becomes maximum:

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PSU Sample Paper 1

PSU Sample Paper 1

Multiple choice Questions 

1.   The velocity of sound is the least in which of the following medium:
1) Air                     2) Water                      3)  Wood                     4) Vacuum

2.   Two amplifier stages have voltage gains of 100 and 200.  The total decibel voltage gain of the cascaded amplifiers is:
      1)  46 dB               2)  86 dB                     3)  66 dB                     4) 106 dB

3.   In the circuit shown, what is the minimum value of RL for which the output voltage will remain constant?
 

PSU Sample Question Papers

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