Related Questions

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens
A This will make armature to take heavy current, possibly burning it
B This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
C Nothing will happen to motor
D Motor will come to stop
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens
A Nothing will happen to the motor
B This will make armature to take heavy current, possibly burning it
C This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
D Motor will run at very slow speed
Switches and relays should be shown in this position with no operating force or applied energy:
A Normal
B Closed
C Offset
D Application
Which of the following relays is used on long transmission lines?
A Impedance relay
B Mho's relay
C Reactance relay
D None of the above
The phase lag produced by transportation relays
A Is independent of frequency
B Is inversely proportional to frequency
C Increases linearly with frequency
D Decreases linearly with frequency
Discrimination between main and back up protection is provided by the use of relays which are
A fact
B sensitive
C slow
D none of the above
Thermal overload relays are used to protect the motor against over current due to
A short-circuits
B heavy loads
C grounds
D all of the above
Overload relays are of type.
A induction
B solid state
C thermal
D electromagnetic
E all above
The inverse definite mean time relays are used for over current and earth fault protection of transformer against
A heavy loads
B internal short-circuits
C external short-circuits
D all of the above
Directional relays are based on flow of
A power
B current
C voltage wave
D all of the above

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