Q.1
The inductive interference between power and communication line can be minimized by
Q.2
A thermal protection switch can protect against
Q.3
Thermal circuit breaker has
Q.4
The time of closing the cycle, in modern circuit breakers is
Q.5
Short-circuit currents are due to
Q.6
Resistance grounding is used for voltage between
Q.7
Transmission line has reflection coefficient as one.
Q.8
Discrimination between main and back up protection is provided by the use of relays which are
Q.9
Thermal overload relays are used to protect the motor against over current due to
Q.10
Magnetic circuit breaker has ______ trip action.
Q.11
In a circuit breaker the basic problem is to
Q.12
When a transmission line is energized, the wave that propagates on it is
Q.13
The arcing contacts in a circuit breaker are made of
Q.14
Air blast circuit breaker is used for
Q.15
The steady state stability of the power system can be increased by
Q.16
The fuse rating is expressed in terms of
Q.17
A fuse is never inserted in
Q.18
A.C. network analyzer is used to solve problems of
Q.19
Interruption of large currents by relay requires
Q.20
D.C. shunt relays are made of
Q.21
An isolator is installed
Q.22
Circuit breakers usually operate under
Q.23
To protect most of the electrical equipment handling low power, the types of relays used are
Q.24
A fuse in a motor circuit provides protection against
Q.25
In Railway applications ______ circuit breaker is used.
Q.26
A short-circuit is identified by
Q.27
________ relay is preferred for phase fault on short transmission line.
Q.28
For the protection of power station buildings against direct strokes the requirements are
Q.29
Overheating of relay contacts or contact born out is due to
Q.30
To reduce short circuit fault currents are used.
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