Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

Electrical Machines
Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

1, 4, 6

1, 2, 5

1, 3, 5

1, 2, 6

1, 4, 6

1, 2, 5

1, 3, 5

1, 2, 6

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The slot edges in a DC machine are made of

Mild steel.

Cast iron.

Fibre.

Silicon steel.

Mild steel.

Cast iron.

Fibre.

Silicon steel.

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DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Both of above.

None of these.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

Both of above.

None of these.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

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Which single phase motor is used for a refrigerator?

Repulsion.

Universal.

Split phase.

Capacitor run.

Repulsion.

Universal.

Split phase.

Capacitor run.

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An inverted V curve of synchronous motor shows variation of

supply voltage and field current at constant excitation.

power factor and DC excitation at constant load.

supply voltage and excitation current at constant load.

power factor and supply voltage during hunting.

supply voltage and field current at constant excitation.

power factor and DC excitation at constant load.

supply voltage and excitation current at constant load.

power factor and supply voltage during hunting.

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If a DC motor is connected across the AC supply it will

Not run.

Run at normal speed.

Run at lower speed.

Burn.

Not run.

Run at normal speed.

Run at lower speed.

Burn.

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Electrical Machines

Electrical Machines The slot edges in a DC machine are made of

Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines Which single phase motor is used for a refrigerator?

Electrical Machines An inverted V curve of synchronous motor shows variation of

Electrical Machines If a DC motor is connected across the AC supply it will

Electrical Machines
The slot edges in a DC machine are made of

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
Which single phase motor is used for a refrigerator?

Electrical Machines
An inverted V curve of synchronous motor shows variation of

Electrical Machines
If a DC motor is connected across the AC supply it will