In the protection of transformers, harmonic restraint is used to guard against

DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Magnetizing inrush current

Lightning

Unbalanced protection

Switching over voltages

Magnetizing inrush current

Lightning

Unbalanced protection

Switching over voltages

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DGVCL Exam Paper (11-12-2011)
If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

Check the load

Insert a fuse of higher current rating

Reduce the load

Insert a fuse of higher voltage rating

Check the load

Insert a fuse of higher current rating

Reduce the load

Insert a fuse of higher voltage rating

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DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

Induction motor

Synchronous generator

Induction generator

Synchronous motor

Induction motor

Synchronous generator

Induction generator

Synchronous motor

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DGVCL Exam Paper (11-12-2011)
At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

Resistor

Voltage source

Conductor

Capacitor

Resistor

Voltage source

Conductor

Capacitor

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Reduce winding losses

Eliminate hunting and provide adequate starting torque

Reduce bearing friction

Eliminate losses on account of fair friction

Reduce winding losses

Eliminate hunting and provide adequate starting torque

Reduce bearing friction

Eliminate losses on account of fair friction

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

Torque and speed are inversely proportional to the square of the armature current

Torque and speed are proportional to the square of the armature current

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

Torque and speed are inversely proportional to the square of the armature current

Torque and speed are proportional to the square of the armature current

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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011) In the protection of transformers, harmonic restraint is used to guard against

DGVCL Exam Paper (11-12-2011) If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

DGVCL Exam Paper (11-12-2011) If the excitation of a synchronous generator fails, it acts as a

DGVCL Exam Paper (11-12-2011) At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

DGVCL Exam Paper (11-12-2011) The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011) DC series motors are best suited for traction work because

DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

DGVCL Exam Paper (11-12-2011)
If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

DGVCL Exam Paper (11-12-2011)
At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because