SSC JE electrical Mock Test Paper 2019| MES Electrical

Ques.71. The graph of an electrical network has N nodes and B branches. The number of independent KVL equations

  1. b-N-1
  2. b-N+1
  3. b-N
  4. b+N+1

Answer.2. b-N+1

 

Ques.72. A 4 pole, 150 Hz, 3 ϕ- induction motor has blocked rotor reactance per phase is four times to the rotor resistance per phase. The speed at which maximum torque developed is __________ rpm.

  1. 1124
  2. 1125
  3. 1126
  4. 1127

Answer.2. 1125

 

Ques.73. A single channel digital storage oscilloscope uses a 12 bit, 108 samples/s ADC. For a 10 kHz sine wave input, what is the number of samples taken per cycle of input?

  1. 1012
  2. 108
  3. 104
  4. 102

Answer.3. 104

 

Ques.74. In the equivalent circuit of a double-cage induction motor, the two rotor cages can be considered

  1. To be in parallel
  2. To be in Series-Parallel
  3. To be in series
  4. To be in Parallel with the starter

Answer.1. To be in parallel

 

Ques.75. A moving iron ammeter produces a full-scale torque of 240 μNm with a deflection of 120o at a current of 10 A. The rate of change of self-inductance (μH/radian) of the instrument at full scale is

  1. 2.0 µH/radian
  2. 4.8 µH/radian
  3. 6 µH/radian
  4. 10 µH/radian

Answer.2. 4.8 µH/radian

 

Ques.76. A 4 ½ digit DMM has the error specification as:- 0.2% of reading +10 counts. If a dc voltage of 100 V is read on its 200 V full scale, the maximum error that can be expected in the reading is

  1. ±0.1%
  2. ±0.3%
  3. ±0.4%
  4. ±0.2%

Answer.2. ±0.3%

 

Ques.77. The initial power transmission of a transmission line is 100 MW, due to the compensation change in the power for 50% compensation is

  1. 100 MW
  2. 150 MW
  3. 200 MW
  4. 250 MW

Answer.3. 200 MW

 

Ques.78. Which of the following gives the equivalent inertia constant of the system if the inertia constant of the two machines which are not swinging together are M1 and M2?

  1. M1 + M2
  2. M1 − M2
  3. M1/M2
  4. M1M2

Answer.2. M1 − M2

 

Ques.79. What is the symmetrical breaking current if A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs?

  1. 100 KA
  2. 75 KA
  3. 35 KA
  4. 15 KA

Answer.3. 35 KA

 

Ques.80. Which of the following is favorable for switching in case of the frequent switchover of Loads for an industrial power distribution System with a load current of around 100A?

  1. Circuit Breaker
  2. Fuse
  3. Contactors
  4. Fuse Contactors

Answer.4. Fuse Contactors

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