SSC JE electrical Mock Test Paper 2019| MES Electrical

SSC previous year solved electrical papers / March 15, 2022

Ques.21. A 230 V single phase energy meter has a constant load current of 4 A passing through if for 5 hours at unity power factor. If the meter makes 1104 revolutions during this period, the meter constant is

  1. 240 rev/kWh
  2. 480 rev/kWh
  3. 720 rev/kWh
  4. 960 rev/kWh

Answer.1. 240 rev/kWh

 

Ques.22. A load of 4 MW load, a capacitor of 2MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of service, the load power factor becomes:

  1. 0.6
  2. 0.4
  3. 0.85 lagging
  4. 0.85 leading

Answer.3. 0.85 lagging

 

Ques.23. Why is a damping of a ballistic galvanometer kept small?

  1. To get minimum overshoot
  2. To make the system critically damped
  3. To make the system oscillatory
  4. To get the first deflection large

Answer.4. To get the first deflection large

 

Ques.24. In a digital voltmeter, the oscillator frequency is 400 KHz. The Ramp voltage falls from 8V to 0V in 20 ms. What is the number of pulses counted by the counter?

  1. 8000
  2. 4000
  3. 3200
  4. 1600

Answer.1. 8000

 

Ques.25. In a LASER, why mirrors are installed at ends of Laser sealed tubes?

  1. To reflects light as a stream
  2. To reflect/transmit light in the form of a concentrated stream
  3. To transmit light as a mixture
  4. To use light to penetrate

Answer.2. To reflect/transmit light in the form of a concentrated stream

 

Ques.26. Consider the following statements regarding capability curves of a synchronous generator:

1) The MVA loading should not exceed the generator rating.
2) The field current should not be allowed to exceed a specified value determined by field heating.
3) The MW loading should not exceed the rating of the prime mover.
4) The load angle must be more than 90°.
Which of the above statements are correct?

  1. 1, 2, 3 and 4
  2. 1 and 4 only
  3. 1, 2 and 3 only
  4. 2, 3 and 4 only

Answer.3. 1, 2 and 3 only

 

Ques.27. If the total powers consumed by three identical phase loads connected in delta and star configuration are W1 and W2respectively, then W1 is

  1. 3W2
  2. √3W2
  3. W2/√3
  4. √2W2

Answer.1. 3W2

 

Ques.28. Power plant having maximum demand more than the installed rated capacity will have utilization factor

  1. Equal to unity
  2. Less than unity
  3. More than unity
  4. None

Answer.3. More than unity

 

Ques.29. What is prefix tera equivalent to?

  1. 103
  2. 105
  3. 109
  4. 1012

Answer.4. 1012

 

Ques.30.The chief deterrent to the widespread application of superconducting materials is

  1. Very difficult to form, machine or cast
  2. The difficulty in attaining and maintaining an extremely low temperature 
  3. The poor strength-to-weight ratio
  4. The lower oxidation rate elevated the temperature

Answer.2. The difficulty in attaining and maintaining an extremely low temperature 

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