CL wadhwa bits solutions (78-85)

Lesson 14 of 21 • 40 upvotes • 12:30mins

Anvesh Sameer

78. The inertia constant of two groups of machines, which swing together are M1 and M2. The inertia constant of the system is: (a) M M M M 1 2 1 + 2 (b) M1 – M2, M1 > M2 (c) M1 + M2 (d) M M M M 1 2 1 2 + . 79. The leakage resistance of a 50 km long cable is 1 MΩ. For a 100 km long cable it will be: (a) 1 MΩ (b) 2 MΩ (c) 0.66 MΩ (d) None of the above. 80. The coefficient of reflection for current for an open ended line is: (a) 1.0 (b) 0.5 (c) – 1.0 (d) Zero. 81. The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is: (a) 0.75 (b) 0.375 (c) 1.33 (d) None of the above.   
 82. The maximum demand of a consumer is 2 kW and his daily energy consumption is 20 units. His load factor is: (a) 10% (b) 41.6% (c) 50% (d) None of the above. 83. Resistance switching is normally resorted in case of: (a) Bulk oil circuit breakers (b) Minimum oil circuit breakers (c) Air blast circuit breakers (d) All types of breakers. 84. If the inductance and capacitance of a system are 1.0 H and 0.01 μF respectively and the instantaneous value of current interrupted is 10 amp, the voltage across the breaker contacts will be: (a) 50 kV (b) 100 kV (c) 60 kV (d) 57 kV. 85. The p.u. synchronous impedance of a machine is 2.0 p.u., its SCR is: (a) 2 (b) 1.414 (c) 0.5 (d) 0.707.