A. Zero
B. Unity
C. Infinity
D. None of the above
Related Mcqs:
- When a wave propagates on a transmission line, it suffers reflection several times at_____________?
A. tapping
B. load end
C. sending end
D. sending and other end
E. all of the above - The reflection co-efficient at the open circuited end of a transmission line___________?
A. zero
B. infinity
C. unity
D. none of the above - transmission line has reflection coefficient as one?
A. Open circuit
B. Short-circuit
E. Long
D. None of the above - Which of the following devices will receive voltage surge first travelling on the transmission line ?
A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear - When a transmission line is energized, the wave that propagates on it is____________?
A. current wave only
B. voltage wave only
C. Both (A) and (B)
D. power factor wave only - A transmission line is protected by_____________?
A. inrush protection
B. distance protection
C. time graded and current graded over current protection
D. both (B) and (C)
E. none of the above - relay is preferred for phase fault on short transmission line?
A. Induction type
B. Reactance
C. Impedance
D. None of the above - If the fault occurs near the impedance relay, the VII ratio will be____________?
A. constant for all distances
B. lower than that of if fault occurs away from the relay
C. higher than that of if fault occurs away from the relay
D. none of the above - Wave trap is used to trap waves of__________________?
A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above - An efficient and a well designed protective relaying should have_____________?
A. good selectivity and reliability
B. economy and simplicity
C. high speed and selectivity
D. all of the above
