A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

field winding was wrongly connected

there was no residual magnetism in the field circuit

there was a break in the armature circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was no residual magnetism in the field circuit

there was a break in the armature circuit

field resistance was higher than critical resistance

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

as it carries large load current.

to provide large flux.

in order to reduce eddy current to provide large flux.

to reduce the insulation of materials.

as it carries large load current.

to provide large flux.

in order to reduce eddy current to provide large flux.

to reduce the insulation of materials.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

Synchronous motor.

Single phase induction motor.

DC series motor.

AC slip ring motor.

Synchronous motor.

Single phase induction motor.

DC series motor.

AC slip ring motor.

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Electrical Machines
Reactive power generated or delivered significantly depends on

excitation.

both 1 and 2.

frequency.

load angle.

excitation.

both 1 and 2.

frequency.

load angle.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

armature circuit

none of above

shunt field

both A and B

armature circuit

none of above

shunt field

both A and B

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Electrical Machines
Induction motors provided with open slots have

more breakdown torque.

leading power factor.

higher efficiency.

less breakdown torque.

more breakdown torque.

leading power factor.

higher efficiency.

less breakdown torque.

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Electrical Machines

Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines Field winding of a DC series motor is usually provided with thick wire

Electrical Machines In travelling cranes for hoisting and lowering which type of motor is preferred?

Electrical Machines Reactive power generated or delivered significantly depends on

Electrical Machines High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

Electrical Machines Induction motors provided with open slots have

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

Electrical Machines
Reactive power generated or delivered significantly depends on

Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

Electrical Machines
Induction motors provided with open slots have