# The line trap unit employed in carrier current relaying method offers:

The line trap unit employed in carrier current relaying method offers: (A) high impedance to 50 Hz power frequency signal (B) high impedance to carrier frequency signal (C) low impedance to carrier frequency signal (D) high impedance to 50 Hz power frequency signal and high impedance to carrier frequency signal

The line trap unit employed in carrier current relaying method offers: high impedance to carrier frequency signal

## Related Questions

Description : The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)

Answer : Ans: B The line trap unit employed in carrier current relaying offers high impedance to carrier frequency signal. Because carrier frequency range is 35 km – 500 kHz XL = 2Π f l Where f increases XL will also increases

Description : Zero-sequence current is used for relaying purpose only in the case of   (a) Phase over current relay (b) Phase impedance relay (c) Ground over current relay (d) Ground impedance relay

Answer : Zero-sequence current is used for relaying purpose only in the case of Ground impedance relay

Description : Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ? (a) Circulating current method (b) Thevenin's theorem (c) Superposition of currents (d) Direct application of Kirehhoffs laws (e) All of the above

Answer : (e) All of the above

Description : Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be

Answer : Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be 0.5 lagging.

Description : Delta Air Lines wishes to purchase five new aeroplanes. Management seeks information from several aircraft manufacturers, screens the offers, and discusses price and terms of sale with the preferred company until a ... method of pricing is: A)administered. B)sealed bid. C)open bid. D)negotiated.