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

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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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231 views 1 answer
Description :

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

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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Description :

Answer :

The armature voltage control of D.C. motor provides constant torque drive.

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Description :

Answer :

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

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Description :

Answer :

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

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105 views 1 answer
Description :

Answer :

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

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121 views 1 answer
Description :

Answer :

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

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68 views 1 answer
Description :

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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103 views 1 answer
Description :

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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Description :

Armature control of DC motor

Answer :

Armature control of DC motor

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143 views 2 answers
Description :

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

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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325 views 1 answer
Description :

The normal value of the armature resistance of a d.c. motor is?

Answer :

The normal value of the armature resistance of a d.c. motor is 0.5.

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898 views 1 answer
Description :

Answer :

When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.

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127 views 1 answer
Description :

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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119 views 1 answer
Description :

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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123 views 1 answer
Description :

Answer :

Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.

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409 views 1 answer
Description :

Answer :

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

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386 views 1 answer
Description :

DC shunt motor

Answer :

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114 views 2 answers
Description :

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.

Answer :

increases

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2.0k views 4 answers
Description :

State any four applications of DC shunt motor.

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

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89 views 2 answers
Description :

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

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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2.6k views 1 answer
Description :

DC motor gross torque example

Answer :

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Description :

Why a dc series motor has a high starting torque?

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72 views 0 answers
Description :

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.

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149 views 1 answer
Description :

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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Description :

Answer :

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

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124 views 1 answer
Description :

Answer :

In a A.C. series motor armature coils are usually connected to commutator through resistance.

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Description :

Answer :

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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Description :

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be

Answer :

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m

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118 views 1 answer
Description :

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

Answer :

In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

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103 views 1 answer
Description :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

Answer :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is unstable torque

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Description :

Answer :

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

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Description :

Answer :

In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.

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Description :

Answer :

Capacitor start motor has high torque in starting

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Description :

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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Description :

Answer :

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

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63 views 1 answer
Description :

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Answer :

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87

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84 views 1 answer
Description :

In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

Answer :

3  Commutation

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218 views 2 answers
Description :

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is  (1) 1000V (2) 100V (3) 600V (4) 10,000V

Answer :

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

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241 views 1 answer
Description :

Aluminium is not used as winding wire for the armature of a dc machine because  (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

Answer :

Aluminium is not used as winding wire for the armature of a dc machine because  (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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546 views 1 answer
Description :

Why is the armature of DC generator laminated?

Answer :

The armature of DC generator is laminated to reduce eddy current losses.

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158 views 1 answer
Description :

Answer :

In a differentially compounded D.C. motor, if shunt field suddenly opens the motor will first stop and then run in opposite direction as series motor.

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76 views 1 answer
Description :

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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108 views 1 answer
Description :

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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172 views 1 answer
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197 views 0 answers
Description :

Answer :

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

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63 views 1 answer
Description :

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 :

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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84 views 1 answer
Description :

Answer :

In a synchronous motor, the armature current has large values for high and low excitation.

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99 views 1 answer
Description :

Answer :

The armature current of the synchronous motor has large values for low and high excitation.

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82 views 1 answer
Description :

Answer :

Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

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143 views 1 answer
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