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Free download in PDF Switchgear and Protection Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Induction cup relay is operated due to changes in
[A]
Current
[B]
Voltage
[C]
Impedance
[D]
All Of The Above
(22)
Which of the following statements is incorrect ?
[A]
Lightning arrestors are used before the switchgear
[B]
Shunt reactors are used as compensation reactors
[C]
The peak short current is (1.8 xV2) times the A.C. component
[D]
The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance
Answer: Lightning arrestors are used before the switchgear
(23)
Bus coupler is very essential in arrangement
[A]
Single Bus
[B]
Double Bus, Double Breaker
[C]
Main And Transfer Bus
[D]
None of the above
Answer: Main And Transfer Bus
(24)
For cost and safety, the outdoor substations are installed for voltages above
[A]
11 kV
[B]
33 kV
[C]
60kV
[D]
110kV
(25)
Distance relays are generally
[A]
Split-Phase Relays
[B]
Reactance Relays
[C]
Impedance Relays
[D]
None Of The Above
Answer: None Of The Above
(26)
A _______ is used to measure the stator % winding temperature of the generator.
[A]
Thermocouple
[B]
Pyrometer
[C]
Resistance Thermometer
[D]
Thermometer
Answer: Resistance Thermometer
(27)
The relay with inverse time characteristic will operate within
[A]
1.5 sec
[B]
5 to 10 sec
[C]
5 to 20 sec
[D]
20 to 30 sec
(28)
Which of the following devices will receive voltage surge first travelling on the transmission line ?
[A]
Lightning arresters
[B]
Relays
[C]
Step-down transformer
[D]
Switchgear
Answer: Lightning arresters
(29)
Series reactors should have
[A]
low resistance
[B]
high resistance
[C]
low impedance
[D]
All Of The Above
(30)
Arc in a circuit breaker is interrupted at
[A]
zero current
[B]
maximum current
[C]
minimum voltage
[D]
maximum voltage
31
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 ?
[A]
Zero
[B]
Unity
[C]
Infinity
[D]
None of the above
32
Over voltage protection is recommended for
[A]
hydro-electric generators
[B]
steam turbine generators
[C]
gas turbine generators
[D]
all of the above
33
Overfluxing protection is recommended for
[A]
distribution transformer
[B]
generator transformer of the power plant
[C]
auto-transformer of the power plant
[D]
station transformer of the power plant
Answer: generator transformer of the power plant
34
Admittance relay is _______ relay.
[A]
Impedance
[B]
Directional
[C]
Non-Directional
[D]
None Of The Above
35
The material used for fuse must have
[A]
low melting point and high specific resistance
[B]
low melting point and -low specific resistance
[C]
high melting point and low specific resistance
[D]
low melting point and any specific resistance
Answer: low melting point and high specific resistance
36
The steady state stability of the power system can be increased by
[A]
connecting lines in parallel
[B]
connecting lines in series
[C]
using machines of high impedance
[D]
all of the above
Answer: connecting lines in parallel
37
A fuse is connected
[A]
either in series or in parallel with circuit
[B]
in parallel with circuit
[C]
in series with circuit
[D]
None Of The Above
Answer: in series with circuit
38
A fuse is never inserted in
[A]
neutral wire
[B]
negative of D.C. circuit
[C]
positive of D.C. circuit
[D]
None Of The Above
39
A switchgear is device used for
[A]
interrupting an electrical circuit
[B]
switching an electrical circuit 111
[C]
switching and controlling an electrical circuit
[D]
switching, controlling and protecting the electrical circuit and equipment
Answer: interrupting an electrical circuit
40
By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
[A]
Radiation
[B]
Convection
[C]
Conduction
[D]
None Of The Above
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