CL WADHWA bits solutions (8-14)

Lesson 3 of 21 • 66 upvotes • 14:59mins

Anvesh Sameer

8. Carrier current protection scheme is normally used for: (a) HV transmission lines only (b) HV cables only (c) HV transmission and cables. 9. The ratio of reset to pick up current for an induction cup relay is approx: (a) 0.99 (b) 1.01 (c) 0.75 (d) None of the above. 10. The rotation of disc of an induction disc relay under the poles is: (a) From unshaded pole to shaded pole (b) From shaded pole to unshaded pole (c) It depends upon the magnitude of current (d) It depends upon the C.T. secondary connection. 11. If the time of operation of a relay for unity TMS is 10 secs., the time of operation for 0.5 TMS will be: (a) 20 secs (b) 5 secs (c) 10 secs (d) None of the above. 12. The shape of the disc of an induction disc relay is: (a) Circular (b) Spiral (c) Elliptic. 13. If the phase angle of the voltage coil of a directional relay is 50° the maximum torque angle of the relay is: (a) 130° (b) 100° (c) 25° (d) None of the above. 14. A reactance relay is: (a) Voltage restrained directional relay (b) Directional restrained over-current relay (c) Voltage restrained over-current relay (d) None of the above.