Inrush protection
Distance protection
Time graded and current graded over current protection
Both (B) and (C)
Answer is Right!
Answer is Wrong!
Switchgear protections
42. Arc in a circuit behaves as
a capackive reactance
an inductive reactance
a resistance increasing with voltage rise across the arc
a resistance decreasing with voltage rise across the arc
Answer is Right!
Answer is Wrong!
43. Distance relays are generally
split-phase relays
reactance relays
impedance relays
none of the above
Answer is Right!
Answer is Wrong!
44. The material used for fuse must have
low melting point and high specific resistance
low melting point and -low specific resistance
high melting point and low specific resistance
low melting point and any specific resistance
Answer is Right!
Answer is Wrong!
45. Insulation resistance of high voltage circuit breakers is more than
1 mega ohms
10 mega ohms
100 mega ohms
500 mega ohms
Answer is Right!
Answer is Wrong!
Detailed SolutionInsulation resistance of high voltage circuit breakers is more than
46. The single phasing relays are used for the protection of
single phase motors only
two phase motors only
two single phase motors running in parallel
three phase motors
Answer is Right!
Answer is Wrong!
Detailed SolutionThe single phasing relays are used for the protection of
47.
Load flow
Load flow and short-circuit
network analyzer is used to solve problems of A. Load flow B. Load flow and short-circuit C. Load flow and stability
Load flow, short-circuit and stability
Answer is Right!
Answer is Wrong!
48. A differential relay measures the vector difference between
two currents
two voltages
two or more similar electrical quantities
none of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionA differential relay measures the vector difference between
49. To reduce short circuit fault currents are used.
reactors
resistors
capacitors
none of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionTo reduce short circuit fault currents are used.
50. Protection by fuses is generally not used beyond
20 A
50 A
100 A
200 A
Answer is Right!
Answer is Wrong!
Detailed SolutionProtection by fuses is generally not used beyond