Switchgear Protections - Interview Questions | Exam2Win

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51. Arc in a circuit breaker is interrupted at

A. zero current

B. maximum current

C. minimum voltage

D. maximum voltage

Explanation:

52. For which of the following protection from negative sequence currents is provided ?

A. Generators

B. Motors

C. Transmission line

D. Transformers

Explanation:

53. Which of the following statements is incorrect ?

A. Lightning arrestors are used before the switchgear

B. Shunt reactors are used as compensation reactors

C. The peak short current is (1.8 xV2) times the A.C. component

D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

Explanation:

54. A.C. network analyser is used to solve problems of

A. load flow

B. load flow and short-circuit

C. load flow and stability

D. load flow, short-circuit and stability

Explanation:

55. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

A. Zero

B. Unity

C. Infinity

D. None of the above

Explanation: