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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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Answer :

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

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Description :

Answer :

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

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116 views 1 answer
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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319 views 1 answer
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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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113 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 :

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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222 views 1 answer
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 :

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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193 views 1 answer
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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139 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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108 views 1 answer
Description :

Answer :

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

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106 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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122 views 1 answer
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 :

DC shunt motor

Answer :

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113 views 2 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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85 views 2 answers
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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171 views 1 answer
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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162 views 1 answer
Description :

Answer :

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

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59 views 1 answer
Description :

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

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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152 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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107 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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83 views 1 answer
Description :

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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96 views 1 answer
Description :

Answer :

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

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79 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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159 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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74 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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166 views 1 answer
Description :

Answer :

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

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76 views 1 answer
Description :

Answer :

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.

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305 views 1 answer
Description :

Answer :

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

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55 views 1 answer
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 :

Answer :

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

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73 views 1 answer
Description :

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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79 views 1 answer
Description :

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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120 views 1 answer
Description :

Answer :

Cumulatively compounded D.C. motor will be suitable along with flywheel for intermittent light and heavy loads.

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119 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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361 views 1 answer
Description :

What are the speed control methods of dc motor?

Answer :

Field control of DC motor Armature control of DC motor

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156 views 2 answers
Description :

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

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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128 views 1 answer
Description :

Answer :

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

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124 views 1 answer
Description :

The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

Answer :

It   can  be  corrected  by  increasing  the  input  to  the  prime  mover.

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172 views 2 answers
Description :

A d.c. motor can be looked upon as d.c. generator with the power flow?

Answer :

A d.c. motor can be looked upon as d.c. generator with the power flow reversed.

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3.1k views 1 answer
Description :

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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74 views 1 answer
Description :

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?

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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133 views 1 answer
Description :

Answer :

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

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118 views 1 answer
Description :

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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142 views 1 answer
Description :

Answer :

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

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89 views 1 answer
Description :

Answer :

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

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401 views 1 answer
Description :

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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79 views 1 answer
Description :

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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66 views 1 answer
Description :

Answer :

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

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58 views 1 answer
Description :

Answer :

A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

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76 views 1 answer
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