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Electrical Engineering
Switchgear & Protection
Quiz 2
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Q.1
The impulse ratio of a rod gap is:
Unity
Between 1.5 and 2.3
Between 1.6 and 1.8
Between 2 and 2.2.
Q.2
What are the isolation requirements for a hot water heater?
4.8.2.3
4.8.1
2.5.3
None of these
Q.3
What are the requirements for the installation of an isolation switch for an electric space heater?
4.9
2.10
2.10.1
4.9.2
Q.4
How do you determine the minimum interrupting capacity rating of a motor isolator switch if it is installed directly in the motor supply circuit?
4.13
4.12.1.3
4.13.1.2
None of these
Q.5
What are the requirements for installing isolation switches for fire pumps?
7.2.5.6.1
7.1
5.3.5
10.2
Q.6
How should a MIMS cable be connected to a motor that is subject to vibration?
3.9.7.3.b
3.9
3.8
None of these
Q.7
For the protection of power station buildings against direct strokes the requirements are
(a) interception,
(b) interception and conduction,
(c) interception, conduction and dissipation
(d) interception, conduction, dissipation and reflection
Q.8
How should floor heating cables be installed?
4.10.21
4.13.1.2
4.10.2
None of these
Q.9
What is the minimum rating of a motor that would require overload protection?
4.13.1.2
4.13.2
Both A & B
None of these
Q.10
When any material has negative magnetism, the material is called as
Paramagnetic
Diamagnetic
Ferromagnetic
Antiferromagnetic
Q.11
The hysteresis losses do not depend on
Volume of material
Magnetic field
Frequency
Either of them
None of these
Q.12
Permeability in the magnetic circuit is analogous to
Resistance in electrical circuit
Resistivity in electrical circuit
Conductivity in electrical circuit
Current density
None of the above
Q.13
The current transformer can also be used to measured high d.c. current.
true
false
Q.14
An SF6 circuit breaker uses______________ gas as a dielectric medium in the interrupting unit.
Sulfur Hexaflouride (SF6)
Sulfur Hexaflouride (SF5)
Sulfur Hexaflouride (SF3)
Sulfur Hexaflouride (SF9)
Q.15
True or False?If the circuit breaker opens onto a faulty circuit it receives an immediate trip signal from the protection, which causes it to trip.
True
False
Q.16
________________circuit breakers use oil as the dielectric medium in the interrupting unit. The arc interrupter is a confined space where the arc always burns inside of a gas bubble.
H2S
oil
gas
compressed oil
Q.17
The breaker is completely off the bus and disconnected from the secondary disconnect. Which position is this called?
connect position
disconnect position
withdrawn position
parallel position
Q.18
_______________circuit breakers uses air as the dielectric medium in the interrupting unit
gas
electrons
steam
air
Q.19
What does MCC stand for ?
Master control centre
Motor control centre
Minding control centre
Maximizing control centre
Q.20
Switchgears are provided with___________ to ensure a proper and safe operating sequence to prevent danger to personnel or damage to nearby or associated equipment
interlocks
busbars
grounding trucks
grounding rods
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