Multiple Choice Questions on Power Systems - 6
Important Multiple Choice Questions On Power
Systems
1.
Plug-setting of a relay can be
altered by varying
A)
Number of
ampere-turns
B)
Air gap of magnetic path
C)
Adjustable back up stop
D)
None of these
2.
If the time of operation of a
relay for unity TMS is 10 sec, the time of operation of 0.5 TMS will be
A)
20 Sec
B)
5 Sec
C)
10 Sec
D)
None of these
3.
Where the voltages are high and
current to be interrupted is low, the breaker proffered is
A)
Air blast CB
B)
Oil CB
C)
Vacuum CB
D)
Any of these
4.
Resistance switching is
normally employed in
A)
All breakers
B)
Bulk oil breakers
C)
Minimum oil breakers
D)
Air blast
circuit breakers
5.
For protection of rotating
machines against lightning surges a combination of
A)
Lighting conductor and
capacitors are used
B)
Lighting conductor and lighting
arrestors are used
C)
Lighting
arrestors and capacitors are used
D)
Lighting arrestors alone is
used
6.
The rate of rise of restricting voltage depends upon the
A)
Type of circuit breaker
B)
Inductance of the system only
C)
Capacitance of the system only
D)
Inductance
and capacitance of the system
7.
The insulation of modern EHV
lines is designed based on
A)
The lighting voltage
B)
The switching
voltage
C)
Corona
D)
RI
8.
A large-size alternator is
protected against over loads by providing
A)
Over current relays
B)
Temperature
sensitive relays
C)
Thermal relays
D)
A combination of (A) and (B)
9.
The most suitable circuit
breaker for short line fault without switching resistor is
A)
Air blast circuit breaker
B)
Minimum oil circuit breaker
C)
Sulphur
hexafluoride circuit breaker
D)
None of these
10.
The capacitor switching is
easily done with
A)
Air blast circuit breaker
B)
Oil circuit breaker
C)
Vacuum
circuit breaker
D)
Any one of these
Comments