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Electrical Engineering
Switchgear Protections
Quiz 2
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Q.1
Wave trap is used to trap waves of
power frequencies
higher frequencies entering generator or transformer units
either of the above
none of the above
Q.2
SF6 gas
is yellow in colour
is lighter than air
is nontoxic
has pungent small
none of the above
Q.3
The fuse wire, in D.C. circuits, is inserted in
negative circuit only
positive circuit only
both (A) and (B)
either (A) or (B)
Q.4
The main function of a fuse is to
protect the line
open the circuit
protect the appliance
prevent excessive currents
none of the above
Q.5
The information to the circuit breaker under fault conditions is provided by
relay
rewirable fuse
H.R.'only
all of the above
Q.6
H.R.C. fuses provide best protection against
overload
reverse current
open-circuits
short-circuits
Q.7
Air blast circuit breakers for 400 kV power system are designed to operate in
100 microsecond
50 millisecond
0.5 sec
0.1 sec
Q.8
Series reactors should have
low resistance
high resistance
low impedance
high impedance
Q.9
Insulation resistance of high voltage circuit breakers is more than
1 mega ohms
10 mega ohms
100 mega ohms
500 mega ohms
Q.10
An efficient and a well designed protective relaying should have
good selectivity and reliability
economy and simplicity
high speed and selectivity
all of the above
Q.11
Distance relays are generally
split-phase relays
reactance relays
impedance relays
none of the above
Q.12
In a single bus-bar system there will be complete shut down when
fault occurs on the bus itself
fault occurs on neutral line
two or more faults occur simultaneously
fault occurs with respect to earthing
Q.13
A differential relay measures the vector difference between
two currents
two voltages
two or more similar electrical quantities
none of the above
Q.14
The power loss is an important factor for the design of
transmission line
motor
generator
feeder
Q.15
For which of the following protection from negative sequence currents is provided ?
Generators
Motors
Transmission line
Transformers
Q.16
A switchgear is device used for
interrupting an electrical circuit
switching an electrical circuit 111
switching and controlling an electrical circuit
switching, controlling and protecting the electrical circuit and equipment
Q.17
With which of the following, a circuit breaker must be equipped for remote operation ?
Inverse time trip
Time-delay trip
Shunt trip
None of the above
All of the above
Q.18
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
Q.19
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
lubricate the contacts
insulate the contacts from switch body
extinguish the arc
all of the above
none of the above
Q.20
A _______ is used to measure the stator % winding temperature of the generator.
thermocouple
pyrometer
resistance thermometer
thermometer
Q.21
To limit short-circuit current in a power system are used
earth wires
isolators
H.R. fuses
reactors
Q.22
Series capacitors are used to
compensate for line inductive reactance
compensate for line capacitive reactance
improve line voltage
none of the above
Q.23
Large internal faults are protected by
merz price percentage differential protection
mho and ohm relays
horn gaps and temperature relays
earth fault and positive sequence relays
Q.24
The short circuit in any winding of the transformer is the result of
mechanical vibration
insulation failure
loose connection
impulse voltage
Q.25
The arc voltage produced in A.C. circuit breaker is always
In phase with the arc current
Lagging the arc current by 90°
Leading the arc current by 90°
None of the above
Q.26
Circuit breakers are essentially
current carrying contacts called electrodes
arc extinguishers
circuits to break the system
transformers to isolate the two systems
any of the above
Q.27
The relay operating speed depends upon
the spring tension
the rate of flux built up
armature core air gap
all of the above
Q.28
The fuse blows off by
burning
arcing
melting
none of the above
Q.29
For which of the following ratings of the transformer differential protection is recommended ?
above 30 kV
equal to and above 5 MVA
equal to and above 25 MVA
none of the above
Q.30
When a wave propagates on a transmission line, it suffers reflection several times at
tapping
load end
sending end
sending and other end
all of the above
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