D.C. shunt motors are used for driving?

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.

2.7k views 1 answer

asked Jul 5, 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.

158 views 1 answer

asked Mar 20, 2018 by anonymous

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.

203 views 1 answer

asked Mar 20, 2018 by anonymous

During rheostat braking of D.C. series motors?

Last Answer : During rheostat braking of D.C. series motors motor is run as a generator.

85 views 1 answer

asked Mar 20, 2018 by anonymous

Why are the D.C. motors preferred for traction applications?

Last Answer : The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.

159 views 1 answer

asked Mar 20, 2018 by anonymous

State the use of shunt and series resistance used in extension of meter.

State the use of shunt and series resistance used in extension of meter.
Last Answer : Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

88 views 1 answer

asked Sep 6, 2018 by anonymous

Shunt compensation in an EHV line is used to

Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.
Last Answer : Shunt compensation in an EHV line is used to Improve the voltage profile.

5.3k views 1 answer

asked May 8, 2018 by anonymous

Why shunt capacitor is used?

Why shunt capacitor is used?
Last Answer : To improve voltage at receiving end and power factor

94 views 1 answer

asked Mar 15, 2018 by anonymous

A relay used for protection of motors against overload is :

A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last Answer : D

548 views 2 answers

asked May 8, 2018 by anonymous

Stepper motors are used in

Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators
Last Answer : Stepper motors are used in printers

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asked Apr 29, 2018 by anonymous

The capacitors used in single-phase capacitor motors have no?

Last Answer : The capacitors used in single-phase capacitor motors have no polarity marking.

133 views 1 answer

asked Mar 20, 2018 by anonymous

What are the five types of single phase motors used in the industry?

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asked Mar 15, 2018 by anonymous

DC shunt motor

DC shunt motor
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

140 views 2 answers

asked Apr 23, 2020 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.
Last Answer : increases

2.8k views 4 answers

asked Aug 25, 2019 by anonymous

State any four applications of DC shunt motor.

State any four applications of DC shunt motor.
Last Answer : Applications of DC shunt motor: 1) Lathe machines 2) drilling machines 3) milling machines 4) Printing machinery 5) Paper industry 6) centrifugal and reciprocating pumps 7) blowers 8)fans

115 views 2 answers

asked Jul 27, 2019 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

483 views 1 answer

asked May 8, 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

332 views 1 answer

asked May 3, 2018 by anonymous

The purpose of retardation test on D.C. shunt machines is to find out?

Last Answer : The purpose of retardation test on D.C. shunt machines is to find out stray losses.

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asked Mar 20, 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.

168 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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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.

210 views 1 answer

asked Mar 20, 2018 by anonymous

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.

142 views 1 answer

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.

367 views 1 answer

asked Mar 20, 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.

87 views 1 answer

asked Mar 20, 2018 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.

148 views 1 answer

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.

135 views 1 answer

asked Mar 20, 2018 by anonymous

Why are DC motors used in trains and not AC motors ?

Why are DC motors used in trains and not AC motors ?
Last Answer : The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

161 views 1 answer

asked Sep 3, 2019 by anonymous

Which of the following motors can run on both AC and DC?

Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above
Last Answer : Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

179 views 1 answer

asked Apr 29, 2018 by anonymous

In case of conductively compensated D.C. series motors, the compensating winding is provided?

In case of conductively compensated D.C. series motors, the compensating winding is provided?
Last Answer : In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.

97 views 1 answer

asked Mar 20, 2018 by anonymous

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.

379 views 1 answer

asked Mar 20, 2018 by anonymous

Differentially compound D.C. motors can find applications requiring?

Last Answer : Differentially compound D.C. motors can find applications requiring low starting torque.

125 views 1 answer

asked Mar 20, 2018 by anonymous

In a manual shunt motor starter?

Last Answer : In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.

76 views 1 answer

asked Mar 20, 2018 by anonymous

In a dc machine, interpoles are used to

In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction
Last Answer : In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

176 views 1 answer

asked Apr 29, 2018 by anonymous

The voltage used for suburban trains in D.C. system is usually?

Last Answer : The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

89 views 1 answer

asked Mar 22, 2018 by anonymous

In D.C. machines fractional pitch winding is used?

Last Answer : In D.C. machines fractional pitch winding is used to reduce the sparking.

355 views 1 answer

asked Mar 20, 2018 by anonymous

How is a thyristor used to convert AC to DC?

How is a thyristor used to convert AC to DC?
Last Answer : thyristor

123 views 1 answer

asked Mar 19, 2018 by anonymous

Which type of starter is used to start the DC motor?

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asked Mar 15, 2018 by anonymous

Why DC motor is used for traction?

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asked Mar 11, 2018 by anonymous

A 4-pole, dc shunt motor working on 250V takes a current of 2A when running at no load on 1000 rpm. Calculate its back emf and speed at load if the motor takes 51A. Armature and shunt field resistance are 0.2Ω and 250Ω respectively

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asked Jul 29, 2021 by ansarulansari

Describe the Operation of shunt capacitor filter with the help of circuit diagram and waveforms

Describe the operation of shunt capacitor filter with the help of circuit diagram and waveforms.

46 views 0 answers

asked Jul 19, 2021 by nanirur

Operation of shunt capacitor filter and waveforms

Describe the operation of shunt capacitor filter with the help of circuit diagram and waveforms.

5 views 0 answers

asked Jul 19, 2021 by nanirur

Use of shunt reactor in substation

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asked Jul 23, 2019 by anonymous

In which of the following transmission lines, the value of the Shunt admittance should be

In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line
Last Answer : In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

523 views 1 answer

asked May 8, 2018 by anonymous

A shunt fault is characterized by

A shunt fault is characterized by (A) Increase in current, frequency and pf (B) Increase in current, reduction in frequency and pf (C) Increase in current and frequency, reduction in pf (D) Decrease in current and frequency
Last Answer : B

1.0k views 2 answers

asked Apr 28, 2018 by anonymous

The function of shunt in an ammeter is to?

Last Answer : The function of shunt in an ammeter is to by pass the current.

462 views 1 answer

asked Mar 21, 2018 by anonymous

A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?

A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Last Answer : A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.

178 views 1 answer

asked Mar 21, 2018 by anonymous

A cumulatively compounded long shunt generator when operating as a motor would be?

Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

111 views 1 answer

asked Mar 21, 2018 by anonymous

anonymous · Answer 1 · 2018-03-20T21:18:00+0000

Answer :

D.C. shunt motors are used for driving machine tools.

answered Mar 20, 2018 by anonymous

D.C. shunt motors are used for driving?

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