The speed of a D.C. shunt motor can be increased by?

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The speed of a D.C. shunt motor can be increased by?

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asked Mar 20, 2018 by anonymous

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As the load is increased the speed of D.C. shunt motor will?

Last Answer : As the load is increased the speed of D.C. shunt motor will reduce slightly.

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asked Mar 20, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be
Last Answer : A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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asked May 8, 2018 by anonymous

In a D.C. shunt motor, speed is?

Last Answer : In a D.C. shunt motor, speed is independent of armature current.

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If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?

Last Answer : If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.

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asked Mar 20, 2018 by anonymous

Why does the speed of a DC shunt motor decrease as the load increases?

Why does the speed of a DC shunt motor decrease as the load increases?
Last Answer : Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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asked Jul 5, 2019 by anonymous

The speed of a D.C. shunt motor more than its full-load speed can be obtained by?

Last Answer : The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.

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asked Mar 20, 2018 by anonymous

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?

Last Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

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asked Mar 20, 2018 by anonymous

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last Answer : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

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asked May 3, 2018 by anonymous

For a D.C. shunt motor if the excitation is changed?

Last Answer : For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.

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asked Mar 20, 2018 by anonymous

The armature torque of the D.C. shunt motor is proportional to?

Last Answer : The armature torque of the D.C. shunt motor is proportional to armature current.

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asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?

Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

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asked Mar 20, 2018 by anonymous

If the field of a D.C. shunt motor gets opened while motor is running?

Last Answer : If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.

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asked Mar 20, 2018 by anonymous

If field current is decreased in shunt dc motor, the speed of the motor

If field current is decreased in shunt dc motor, the speed of the motor (a) remains same. (b) increases. (c) decreases. (d) none of the above.
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asked Aug 25, 2019 by anonymous

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asked Jul 27, 2019 by anonymous

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?

Last Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

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asked Mar 20, 2018 by anonymous

The speed of a D.C. motor can be controlled by varying

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The speed of a D.C. series motor is?

Last Answer : The speed of a D.C. series motor is inversely proportional to the armature current.

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What are the speed control methods of dc motor?
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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?

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In D.C. shunt motors as load is reduced?

Last Answer : In D.C. shunt motors as load is reduced the speed will remain almost constant.

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In a differentially compounded D.C. motor, if shunt field suddenly opens?

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asked Mar 20, 2018 by anonymous

If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens?

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asked Mar 20, 2018 by anonymous

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D.C. shunt motors are used for driving?

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In variable speed motor?

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Which motor has the poorest speed control?

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

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The speed of a universal motor is usually reduced by using?

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Speed control of a universal motor is achieved by?

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asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

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The speed/load characteristics of a universal motor is same as that of?

Last Answer : The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.?

Last Answer : Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.

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asked Mar 20, 2018 by anonymous

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?

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The speed control of universal motor used for sewing machines is by?

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Why the speed of synchronous motor is constant?

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speed control methods of three phase induction motor?

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In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?

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asked Mar 20, 2018 by anonymous

The fall in speed of a dc generator due to increase in load can be corrected by

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When two D.C. series motors are connected in parallel, the resultant speed is?

Last Answer : When two D.C. series motors are connected in parallel, the resultant speed is normal speed.

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asked Mar 20, 2018 by anonymous

Describe the reason of using dc series motor for electric trains.

Describe the reason of using dc series motor for electric trains.
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asked Sep 18, 2018 by anonymous

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at

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The function of a brush and commutator arrangement in a dc motor is to

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Last Answer : The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque

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If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor?

Last Answer : If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.

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asked Mar 20, 2018 by anonymous

At the instant of starting when a D.C. motor is put on supply, it behaves like?

Last Answer : At the instant of starting when a D.C. motor is put on supply, it behaves like a low resistance circuit.

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asked Mar 20, 2018 by anonymous

anonymous · Answer 1 · 2018-03-20T20:50:03+0000

The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

The speed of a D.C. shunt motor can be increased by?

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