CL wadhwa bits solutions (86-92)

Lesson 15 of 21 • 39 upvotes • 14:59mins

Anvesh Sameer

86. Sheaths are used in cables to: (a) Provide proper insulation (b) Provide mechanical strength (c) Prevent ingress of moisture (d) None of the above. 87. Tick out the correct statement: (a) The higher the initial load, the larger the critical clearing angle (b) The higher the initial load, the lower the critical clearing angle (c) The initial load has nothing to do with the critical clearing angle (d) The higher the operating time of the circuit breaker, the larger will be the critical clearing angle. 88. The capacitance and inductance per unit length of a line operating at 110 kV are 0.01 μF and 2 mH. The surge impedance loading of the line is: (a) 40 MVA (b) 30 MVA (c) 27 MVA (d) None of the above. 89. An RLC series circuit remains predominantly inductive: (a) At resonance frequency (b) Below resonance frequency (c) Above resonance frequency (d) At the lower half power frequency. 90. An alternator is delivering a load current; its per cent regulation is found to be zero. The type of load it delivers is: (a) Capacitive (b) Inductive (c) Resistive. 91. A short length of cable between the dead end tower and the power transformer : (a) Always reduces the steepness of the incident wave
     (b) Reduces the steepness of the wave under certain conditions only (c) It does not change the steepness. 92. For protection of rotating machines against lightning surges a combination of: (a) Lightning conductor and capacitor (b) Lightning conductor and lightning arrester (c) Lightning arrester and capacitor (d) Lightning arrester alone is used.