1. Mho relay have an R-X characteristics depicted by:
a) A straight line passing through origin
b) A straight line parallel to X-axis
c) A straight line parallel to R-axis
d) A circle passing through the origin
2. Any winding of a power transformer develops short circuit owing to:
a) Loose connections
b) Insulation failure
c) Impulse voltage
d) Mechanical vibration
3. The relay used for the feeder protection is:
a) Under-voltage relay
b) Translay relay
c) Thermal relay
d) Buchholz relay
4. The relay best suited for phase fault relaying for medium transmission lines is:
a) Mho relay
b) Reactance relay
c) Impedance relay
d) None of the above
5. For ground fault, which of the relay is preferred:
a) Plain impedance relay
b) Directional relay
c) Reactance relay
d) Over-current relay
6. The short circuit current of an alternator, inc case of line to line fault depends on its:
a) Short circuit resistance
b) Transient reactance
c) Synchronous reactance
d) None of the above
7. Solid earthing is provided for the voltage below:
a) 100 kV
b) 600 V
c) 11 kV
d) 66 kV
8. A lightning arrester connected between the line and earth in a power system
a) Protects the terminal equipment against travelling surges
b) Protects the terminal equipment against lightning strokes
c) Suppresses the high frequency oscillations in the line
d) Reflects back the travelling waves approaching it
9. Thermal relays are used for the protection of motors against over-current owing to:
a) Short circuit
b) Heavy loads
c) Earth fault
d) All the above
10. Buchholz relay is:
a) Located in the conservator tank
b) Located in the transformer tank itself
c) Connected in the pipe connecting main tank of transformer and conservator
d) Installed in the circuit breaker
a) A straight line passing through origin
b) A straight line parallel to X-axis
c) A straight line parallel to R-axis
d) A circle passing through the origin
2. Any winding of a power transformer develops short circuit owing to:
a) Loose connections
b) Insulation failure
c) Impulse voltage
d) Mechanical vibration
3. The relay used for the feeder protection is:
a) Under-voltage relay
b) Translay relay
c) Thermal relay
d) Buchholz relay
4. The relay best suited for phase fault relaying for medium transmission lines is:
a) Mho relay
b) Reactance relay
c) Impedance relay
d) None of the above
5. For ground fault, which of the relay is preferred:
a) Plain impedance relay
b) Directional relay
c) Reactance relay
d) Over-current relay
6. The short circuit current of an alternator, inc case of line to line fault depends on its:
a) Short circuit resistance
b) Transient reactance
c) Synchronous reactance
d) None of the above
7. Solid earthing is provided for the voltage below:
a) 100 kV
b) 600 V
c) 11 kV
d) 66 kV
8. A lightning arrester connected between the line and earth in a power system
a) Protects the terminal equipment against travelling surges
b) Protects the terminal equipment against lightning strokes
c) Suppresses the high frequency oscillations in the line
d) Reflects back the travelling waves approaching it
9. Thermal relays are used for the protection of motors against over-current owing to:
a) Short circuit
b) Heavy loads
c) Earth fault
d) All the above
10. Buchholz relay is:
a) Located in the conservator tank
b) Located in the transformer tank itself
c) Connected in the pipe connecting main tank of transformer and conservator
d) Installed in the circuit breaker
0 comments:
Post a Comment