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Electrical Engineering
Switchgear Protections
Quiz 3
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Q.1
The delay fuses are used for the protection of ________ .
motors
power outlet circuits
fluorescent lamps
light circuits
Q.2
Over voltage protection is recommended for
hydro-electric generators
steam turbine generators
gas turbine generators
all of the above
none of the above
Q.3
Overfluxing protection is recommended for
distribution transformer
generator transformer of the power plant
auto-transformer of the power plant
station transformer of the power plant
Q.4
Fault diverters are basically
fuses
relays
fast switches
circuit breakers
Q.5
Relays can be designed to respond to changes in
resistance, reactance or impedance
voltage and current
light intensity
temperature
all above
Q.6
The interaction between a transmission line and communication line is minimized by
transposing transmission as well as communication lines
increasing the height of the trans-mission line tower
increasing the distance between the two lines
all of the above
Q.7
A transmission line is protected by
Inrush protection
Distance protection
Time graded and current graded over current protection
Both (B) and (C)
Q.8
If the fault occurs near the impedance relay, the VII ratio will be
constant for all distances
lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay
none of the above
Q.9
Oil switches are employed for
low currents circuits
low voltages circuits
high voltages and large currents circuits
all circuits
Q.10
Which of the following medium is employed for extinction of arc in air circuit breaker ?
Water
Oil
Air
SF
6
Q.11
Protective relays are devices that detect abnormal conditions in electrical circuits by measuring
current during abnormal condition
voltage during abnormal condition
constantly the electrical quantities which differ during normal and abnormal conditions
none of the above
Q.12
Ungrounded neutral transmission system is not recommended because of system
insulation being overstressed due to over voltages
insulation overstress may lead to failure and subsequent phase to phase faults
being inadequately protected against ground fault
all of the above
Q.13
Induction cup relay is operated due to changes in
current
voltage
impedance
all of the above
Q.14
The under voltage relay can be used for
generators
busbars
transformers
motors
all of the above
Q.15
The torque produced in induction type relay (shaded pole structure) is
inversely proportional to the current
inversely proportional to the square of the current
proportional to the current
proportional to square of the current
Q.16
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 ?
Zero
Unity
Infinity
None of the above
Q.17
Bus coupler is very essential in arrangement
single bus
double bus, double breaker
main and transfer bus
all of the above
Q.18
On which of the following routine tests are conducted ?
Oil circuit breakers
Air blast circuit breakers
Minimum oil circuit breakers
All of the above
Q.19
Relays are used for phase faults on long line.
Impedance
Reactance
Either of the above
None of the above
Q.20
Which of the following is the least expensive protection for overcurrent is low voltage system ?
Rewireable fuse
Isolator
Oil circuit breaker
Air break circuit breaker
None of the above
Q.21
Which of the following circuit breakers has high reliability and minimum maintenance ?
Air blast circuit breakers
Circuit breaker with SF6 gas
Vacuum circuit breakers
Oil circuit breakers
Q.22
Which of the following parameter can be neglected for a short line?
Inductance
Capacitance
Resistance
Reactance
Q.23
Shunt capacitance is neglected while considering
short transmission line
medium transmission line
long transmission line
medium and long transmission lines
Q.24
In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
Have low contact resistance
Be clean and smooth
Be of sufficient size and proper shape
Have all above properties
Q.25
On which of the following effects of electric current a fuse operates?
Photoelectric effect
Electrostatic effect
Heating effect
Magnetic effect
Q.26
Burden of a protective relay is the power
required to operate the circuit breaker
absorbed by the circuit of relay
developed by the relay circuit
none of the above
Q.27
The line insulation is the insulation level of the station equipment.
less than
same as
more than
proportional to
not directly related with
Q.28
A balanced 3-phase system consists of
zero sequence currents only
positive sequence currents only
negative and zero sequence currents
zero, negative and positive sequence currents
Q.29
By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
Conduction
Radiation
Convection
All of the above
Q.30
Directional relays are based on flow of
power
current
voltage wave
all of the above
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