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Electrical Engineering
Switchgear Protections
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Q.1
The inductive interference between power and communication line can be minimized by
transposition of the power line
transposition of the communication line
both (A) and (B)
increasing the distance between the conductors
Q.2
A thermal protection switch can protect against
short-circuit
temperature
overload
over voltage
Q.3
Thermal circuit breaker has
delayed trip action
instantaneous trip action
both of the above
none of the above
Q.4
The time of closing the cycle, in modern circuit breakers is
0.003 sec
0.001 sec
0.01 sec
0.10 sec
none of the above
Q.5
Short-circuit currents are due to
single phase to ground faults
phase to phase faults
two phase to ground faults
three phase faults
any of these
Q.6
Resistance grounding is used for voltage between
33kV to 66kV
22kV to 33kV
3.3kV and llkV
none of the above
Q.7
Transmission line has reflection coefficient as one.
Open circuit
Short-circuit
Long
None of the above
Q.8
Discrimination between main and back up protection is provided by the use of relays which are
fact
sensitive
slow
none of the above
Q.9
Thermal overload relays are used to protect the motor against over current due to
short-circuits
heavy loads
grounds
all of the above
Q.10
Magnetic circuit breaker has ______ trip action.
delayed
instantaneous
both of the above
none of the above
Q.11
In a circuit breaker the basic problem is to
maintain the arc
extinguish the arc
transmit large power
emit the ionizing electrons
Q.12
When a transmission line is energized, the wave that propagates on it is
current wave only
voltage wave only
both (A) and (B)
power factor wave only
Q.13
The arcing contacts in a circuit breaker are made of
copper tungsten alloy
porcelain
electrolytic copper
aluminium alloy
Q.14
Air blast circuit breaker is used for
over currents
short duty
intermittant duty
repeated duty
Q.15
The steady state stability of the power system can be increased by
Connecting lines in parallel
Connecting lines in series
Using machines of high impedance
Reducing the excitation of machines
Q.16
The fuse rating is expressed in terms of
current
voltage
VAR
kVA
Q.17
A fuse is never inserted in
neutral wire
negative of D.C. circuit
positive of D.C. circuit
phase dine
Q.18
A.C. network analyzer is used to solve problems of
Load flow
Load flow and short-circuit
Load flow and stability
Load flow, short-circuit and stability
Q.19
Interruption of large currents by relay requires
arc suppressing blow out coils
wide separation of the opened contacts
high speed opening of contacts
all of the above
Q.20
D.C. shunt relays are made of
few turns of thin wire
few turns of thick wire
many turns of thin wire
many turns of thick wire
Q.21
An isolator is installed
to operate the relay of circuit breaker
as a substitute for circuit breaker
always independent of the position of circuit breaker
generally on both sides of a circuit breaker
Q.22
Circuit breakers usually operate under
transient state of short-circuit current
sub-transient state of short-circuit current
steady state of short-circuit current
after D. C. component has ceased
Q.23
To protect most of the electrical equipment handling low power, the types of relays used are
Thermocouple
Electronic and bimetallic
Both (A) and (B)
None of the above
Q.24
A fuse in a motor circuit provides protection against
overload
short-circuit and overload
open circuit, short-circuit and overload
none of the above
Q.25
In Railway applications ______ circuit breaker is used.
SFe
bulk oil
minimum oil
air break
Q.26
A short-circuit is identified by
no current flow
heavy current flow
voltage drop
voltage rise
Q.27
________ relay is preferred for phase fault on short transmission line.
Induction type
Reactance
Impedance
None of the above
Q.28
For the protection of power station buildings against direct strokes the requirements are
interception
interception and conduction
interception, conduction and dissipation
interception, conduction, dissipation and reflection
none of the above
Q.29
Overheating of relay contacts or contact born out is due to
slow making and breaking of load circuit contacts
foreign matter on the contact surface
too low contact pressure
all of the above
Q.30
To reduce short circuit fault currents are used.
reactors
resistors
capacitors
none of the above
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