As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

DC Motors
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

A high value resistor is connected across the field winding

Armature is temporarily open circuited

A resistance is connected parallel to the armature

A resistance is connected in series with armature

A high value resistor is connected across the field winding

Armature is temporarily open circuited

A resistance is connected parallel to the armature

A resistance is connected in series with armature

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DC Motors
In a dc machines the residual magnetism is of the order of

20 to 25 percent

2 to 3 percent

10 to 15 percent

50 to 75 percent

20 to 25 percent

2 to 3 percent

10 to 15 percent

50 to 75 percent

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DC Motors
The torque developed by a dc motor is directly proportional to

Armature resistance × applied voltage

None of the listed here

Armature resistance × armature current

Flux per pole × armature current

Armature resistance × applied voltage

None of the listed here

Armature resistance × armature current

Flux per pole × armature current

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DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

Cumulatively compounded

Series

Shunt

Differentially compounded

Cumulatively compounded

Series

Shunt

Differentially compounded

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DC Motors
If a dc motor is comnected across the AC supply it will

Run at normal speed

Run at lower speed

Not run

Burn due to heat produced in the field winding by eddy currents

Run at normal speed

Run at lower speed

Not run

Burn due to heat produced in the field winding by eddy currents

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DC Motors
The plugging gives the

Smallest torque braking

Zero torque braking

None of the listed here

Highest torque braking

Smallest torque braking

Zero torque braking

None of the listed here

Highest torque braking

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DC Motors

DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

DC Motors In a dc machines the residual magnetism is of the order of

DC Motors The torque developed by a dc motor is directly proportional to

DC Motors For the same H.P. rating and full load speed, following motor has poor starting torque

DC Motors If a dc motor is comnected across the AC supply it will

DC Motors The plugging gives the

DC Motors
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

DC Motors
In a dc machines the residual magnetism is of the order of

DC Motors
The torque developed by a dc motor is directly proportional to

DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

DC Motors
If a dc motor is comnected across the AC supply it will

DC Motors
The plugging gives the