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Electrical Engineering
Switchgear Protections
Quiz 4
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Q.1
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
Q.2
Overload relays are of type.
induction
solid state
thermal
electromagnetic
all above
Q.3
Ionization in circuit breaker is facilitated by
high temperature
increase of mean free path
increasing field strength
all of the above
Q.4
Arc in a circuit breaker is interrupted at
zero current
maximum current
minimum voltage
maximum voltage
Q.5
Admittance relay is _______ relay.
impedance
directional
non-directional
none of the above
Q.6
The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
recovery
surge
operating
arc
none of the above
Q.7
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
Q.8
A fuse is connected
in series with circuit
in parallel with circuit
either in series or in parallel with circuit
none of the above
Q.9
The reflection co-efficient at the open circuited end of a transmission line.
zero
infinity
unity
none of the above
Q.10
Protection by fuses is generally not used beyond
20 A
50 A
100 A
200 A
Q.11
H.R.C. fuse, as compared to a rewirable fuse, has
no ageing effect
high speed of operation
high rupturing capacity
all of the above
Q.12
The inverse definite mean time relays are used for over current and earth fault protection of transformer against
heavy loads
internal short-circuits
external short-circuits
all of the above
Q.13
Which of the following devices will receive voltage surge first travelling on the transmission line ?
Lightning arresters
Relays
Step-down transformer
Switchgear
Q.14
For cost and safety, the outdoor substations are installed for voltages above
11 kV
33 kV
60 kV
110 kV
Q.15
The ground wire should not be smaller than No ______ copper.
2
4
6
10
Q.16
The relay with inverse time characteristic will operate within
1.5 sec
5 to 10 sec
5 to 20 sec
20 to 30 sec
none of the above
Q.17
H.R.C. fuse, as compared to a rewirable fuse, has
no ageing effect
high speed of operation
high rupturing capacity
all of the above
Q.18
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.19
Over voltage protection is recommended for
hydro-electric generators
steam turbine generators
gas turbine generators
all of the above
E. none of the above
Q.20
The short circuit in any winding of the transformer is the result of
mechanical vibration
insulation failure
loose connection
impulse voltage
Q.21
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
E. None of the above
Q.22
Circuit breakers are essentially
current carrying contacts called electrodes
arc extinguishers
circuits to break the system
transformers to isolate the two systems
E. any of the above
Q.23
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.24
A fuse is never inserted in
neutral wire
negative of circuit
positive of circuit
phase dine
Q.25
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.26
Which of the following medium is employed for extinction of arc in air circuit breaker ?
Water
Oil
Air
SF6
Q.27
When a wave propagates on a transmission line, it suffers reflection several times at
tapping
load end
sending end
sending and other end
E. all of the above
Q.28
The fuse blows off by
burning
arcing
melting
none of the above
Q.29
The relay operating speed depends upon
the spring tension
the rate of flux built up
armature core air gap
all of the above
Q.30
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
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