What is the RPM of a DC motor?

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asked Mar 15, 2018 by anonymous

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asked May 3, 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 Apr 29, 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

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 half full load in N -m is :

Last answer: 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 half full load in N -m is : 0.075

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70 views 1 answer

asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

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150 views 2 answers

asked Apr 29, 2018 by anonymous

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

The function of a brush and commutator arrangement in a dc motor is to (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

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

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1.3k views 1 answer

asked May 8, 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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220 views 1 answer

asked Sep 18, 2018 by anonymous

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

Last answer: Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the train picks up ... torque - speed characteristics of DC series motors match, these motors are suitable for electric trains

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114 views 1 answer

asked Sep 9, 2017 by anonymous

is induction motor ac or dc?

Last answer: Induction motor is a AC motor it is also known as asynchronous motor .

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73 views 1 answer

asked Aug 9, 2017 by anonymous

Armature control of DC motor

Last answer: Armature control of DC motor

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126 views 2 answers

asked Aug 9, 2017 by anonymous

Field control of DC motor

Last answer: Field control of DC motor

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91 views 2 answers

asked Aug 9, 2017 by anonymous

Four Quadrant Operation Of DC Motor

Last answer: Four Quadrant Operation Of DC Motor

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207 views 1 answer

asked Aug 9, 2017 by anonymous

Separately Excited DC motor

Last answer: Separately Excited DC motor

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294 views 2 answers

asked Mar 15, 2018 by anonymous

What is the back EMF of a dc motor?

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asked Mar 20, 2018 by anonymous

What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

Last answer: The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

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374 views 1 answer

asked Mar 15, 2018 by anonymous

What is the principle of DC motor?

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asked Aug 18, 2019 by anonymous

What would happen if a DC motor was supplied with AC ?

Last answer: With three phase induction motor, humming and not rotate, but if single phase universal motor like air blower, home mixture, motor run on constant speed..speed variation not possible...

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91 views 2 answers

asked Mar 15, 2018 by anonymous

What are the advantages of DC series motor?

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80 views 0 answers

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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64 views 1 answer

asked Mar 20, 2018 by anonymous

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...

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?

Last answer: 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 resistance is connected in series with armature.

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113 views 1 answer

asked Mar 20, 2018 by anonymous

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to?

Last answer: In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.

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140 views 1 answer

asked Mar 20, 2018 by anonymous

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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70 views 1 answer

asked Mar 20, 2018 by anonymous

The starting resistance of a D.C. motor is generally?

Last answer: The starting resistance of a D.C. motor is generally low.

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76 views 1 answer

asked Mar 20, 2018 by anonymous

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

Last answer: By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.

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79 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.

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92 views 1 answer

asked Mar 20, 2018 by anonymous

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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75 views 1 answer

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.

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122 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. motor is connected across the A.C. supply it will?

Last answer: If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

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75 views 1 answer

asked Apr 29, 2018 by anonymous

In a DC motor, it is important to place the brushes along ______

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Last answer: In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

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65 views 1 answer

asked Mar 20, 2018 by anonymous

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

The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Last answer: The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

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112 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last answer: In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.

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146 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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88 views 1 answer

asked Mar 20, 2018 by anonymous

Sparking at the commutator of a D.C. motor may result in?

Last answer: Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.

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109 views 1 answer

asked Mar 20, 2018 by anonymous

In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be?

Last answer: In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be less than 50%.

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96 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.

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169 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.

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91 views 1 answer

asked Mar 20, 2018 by anonymous

The direction of rotation of a D.C. series motor can be changed by?

Last answer: The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

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75 views 1 answer

asked Jul 5, 2019 by anonymous

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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2.5k views 1 answer

asked Apr 28, 2018 by anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Last answer: The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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122 views 1 answer

asked Apr 28, 2018 by anonymous

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

Last answer: In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians Armature amp-conductors × (1/8 - θ/360o)

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78 views 1 answer

asked Mar 20, 2018 by anonymous

Sparking, is discouraged in a D.C. motor because?

Last answer: Sparking, is discouraged in a D.C. motor because commutator gets damaged.

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94 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last answer: If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses.

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95 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.

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61 views 1 answer

asked Mar 20, 2018 by anonymous

For starting a D.C. motor a starter is required because?

Last answer: For starting a D.C. motor a starter is required because it limits the starting current to a safe value.

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62 views 1 answer

asked Mar 20, 2018 by anonymous

A D.C. series motor is that which?

Last answer: A D.C. series motor is that which has its field winding consisting of thick wire and less turns.

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51 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. series motor is operated on A.C. supply, it will?

Last answer: If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

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63 views 1 answer

asked Apr 30, 2018 by anonymous

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

Last answer: A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : can be operated in first & fourth quadrants

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162 views 1 answer

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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87 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.

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105 views 1 answer

asked Mar 20, 2018 by anonymous

The condition for maximum power in case of D.C. motor is?

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asked Mar 20, 2018 by anonymous

The current drawn by the armature of D.C. motor is directly proportional to?

Last answer: The current drawn by the armature of D.C. motor is directly proportional to the torque required.

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303 views 1 answer

asked Mar 20, 2018 by anonymous

The type of D.C. motor used for shears and punches is?

Last answer: The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.

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101 views 1 answer

What is the RPM of a DC motor?

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