MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
Electrical Engineering
Switchgear Protections
Quiz 5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Oil switches are employed for
low currents circuits
low voltages circuits
high voltages and large currents circuits
all circuits
Q.2
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.3
By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
Radiation
Convection
Conduction
All of the above
Q.4
Relays are used for phase faults on long line.
Impedance
Reactance
Either of the above
None of the above
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
Fault diverters are basically
fuses
relays
fast switches
circuit breakers
Q.7
Ionization in circuit breaker is facilitated by
high temperature
increase of mean free path
increasing field strength
all of the above
Q.8
On which of the following effects of electric current a fuse operates?
Photoelectric effect
Electrostatic effect
Heating effect
Magnetic effect
Q.9
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.10
Shunt capacitance is neglected while considering
short transmission line
medium transmission line
long transmission line
medium and long transmission lines
Q.11
Which of the following parameter can be neglected for a short line?
Inductance
Capacitance
Resistance
Reactance
Q.12
Induction cup relay is operated due to changes in
current
voltage
impedance
all of the above
Q.13
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.14
The delay fuses are used for the protection of ________ .
motors
power outlet circuits
fluorescent lamps
light circuits
Q.15
Overload relays are of type.
induction
solid state
thermal
electromagnetic
E. all above
Q.16
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.17
The line insulation is the insulation level of the station equipment.
less than
same as
more than
proportional to
E. not directly related with
Q.18
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.19
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.20
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.21
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.22
The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
recovery
surge
operating
arc
none of the above
Q.23
Admittance relay is _______ relay.
impedance
directional
non-directional
none of the above
Q.24
Directional relays are based on flow of
power
current
voltage wave
all of the above
Q.25
Protection by fuses is generally not used beyond
20 A
50 A
100 A
200 A
Q.26
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.27
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.28
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.29
The relay with inverse time characteristic will operate within
1.5 sec
5 to 10 sec
5 to 20 sec
20 to 30 sec
E. none of the above
Q.30
Thermal overload relays are used to protect the motor against over current due to
short-circuits
heavy loads
grounds
all of the above
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page