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A D.C. series motor is that which?

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

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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?
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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164 views 1 answer
asked Mar 20, 2018 by anonymous
The speed of a D.C. series motor is?
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
asked Mar 20, 2018 by anonymous
The direction of rotation of a D.C. series motor can be changed by?
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
asked Mar 20, 2018 by anonymous
A.C. series motor as compared to D.C. series motor has?
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
asked Mar 20, 2018 by anonymous
If a D.C. series motor is operated on A.C. supply, it will?
Description :

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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73 views 1 answer
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
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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82 views 1 answer
asked Sep 18, 2018 by anonymous
Describe the reason of using dc series motor for electric trains.
Description :

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

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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120 views 1 answer
asked Mar 20, 2018 by anonymous
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
Description :

Answer :

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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105 views 1 answer
asked Mar 15, 2018 by anonymous
Why a dc series motor has a high starting torque?
Description :

Why a dc series motor has a high starting torque?

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69 views 0 answers
asked May 7, 2020 by anonymous
State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
Description :

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Answer :

Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows:  1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine 

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115 views 1 answer
asked Apr 21, 2020 by anonymous
Brake test on DC series motor
Description :

Brake test on DC series motor

Answer :

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184 views 2 answers
asked Mar 15, 2018 by anonymous
What are the advantages of DC series motor?
Description :

What are the advantages of DC series motor?

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83 views 0 answers
asked Mar 15, 2018 by anonymous
Why dc series motor should not be started at no load?
Description :

Why dc series motor should not be started at no load?

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605 views 0 answers
asked Mar 20, 2018 by anonymous
In a A.C. series motor armature coils are usually connected to commutator?
Description :

Answer :

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

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111 views 1 answer
asked Mar 20, 2018 by anonymous
In case of conductively compensated D.C. series motors, the compensating winding is provided?
Description :

Answer :

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

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83 views 1 answer
asked Mar 20, 2018 by anonymous
When two D.C. series motors are connected in parallel, the resultant speed is?
Description :

Answer :

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

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327 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?
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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91 views 1 answer
asked Apr 27, 2020 by anonymous
Write two applications of D.C. series motor.
Description :

Write two applications of D.C. series motor. 

Answer :

The applications of D.C. series motor: 1. Cranes 2. Hoists 3. Trolley and cars 4. Conveyors 5. For traction work i.e. electric locomotives 6. Elevator 7. Air compressor

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62 views 1 answer
asked Mar 20, 2018 by anonymous
In A.C. series motor compensating winding is employed to?
Description :

Answer :

In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

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126 views 1 answer
asked Mar 20, 2018 by anonymous
Which D.C. motor is generally preferred for cranes and hoists ?
Description :

Answer :

D.C. Series motor is generally preferred for cranes and hoists.

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88 views 1 answer
asked Mar 20, 2018 by anonymous
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
Description :

Answer :

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

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117 views 1 answer
asked Mar 20, 2018 by anonymous
Which D.C. motor has got maximum self loading property?
Description :

Answer :

Differentially compounded D.C. motor has got maximum self loading property.

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64 views 1 answer
asked Mar 20, 2018 by anonymous
Which D.C. motor is preferred for elevators ?
Description :

Answer :

Cumulative compound D.C. motor is preferred for elevators.

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88 views 1 answer
asked Mar 21, 2018 by anonymous
When two D.C. series generators are running in parallel, an equilizer bar is used?
Description :

Answer :

If  equalising bar is connected to the 2 DC generators  the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

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136 views 2 answers
asked Mar 20, 2018 by anonymous
During rheostat braking of D.C. series motors?
Description :

Answer :

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

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68 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?
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
asked Mar 20, 2018 by anonymous
For a D.C. shunt motor if the excitation is changed?
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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138 views 1 answer
asked Mar 20, 2018 by anonymous
The speed of a D.C. motor can be controlled by varying
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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145 views 1 answer
asked Mar 20, 2018 by anonymous
At the instant of starting when a D.C. motor is put on supply, it behaves like?
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
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?
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
asked Mar 20, 2018 by anonymous
The speed of a D.C. shunt motor can be increased by?
Description :

Answer :

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

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98 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...
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
asked Mar 20, 2018 by anonymous
In a differentially compounded D.C. motor, if shunt field suddenly opens?
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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73 views 1 answer
asked Mar 20, 2018 by anonymous
Sparking, is discouraged in a D.C. motor because?
Description :

Answer :

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

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118 views 1 answer
asked Mar 20, 2018 by anonymous
Sparking at the commutator of a D.C. motor may result in?
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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141 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?
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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105 views 1 answer
asked Mar 20, 2018 by anonymous
The starting resistance of a D.C. motor is generally?
Description :

Answer :

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

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89 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?
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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117 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?
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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212 views 1 answer
asked Mar 20, 2018 by anonymous
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
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
asked Mar 20, 2018 by anonymous
In a D.C. shunt motor, speed is?
Description :

Answer :

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

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68 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?
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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101 views 1 answer
asked Mar 20, 2018 by anonymous
If a D.C. motor is connected across the A.C. supply it will?
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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78 views 1 answer
asked Mar 20, 2018 by anonymous
For starting a D.C. motor a starter is required because?
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
asked Mar 20, 2018 by anonymous
If the field of a D.C. shunt motor gets opened while motor is running?
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
asked Mar 20, 2018 by anonymous
The armature voltage control of D.C. motor provides?
Description :

Answer :

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

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55 views 1 answer
asked Mar 20, 2018 by anonymous
The armature torque of the D.C. shunt motor is proportional to?
Description :

Answer :

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

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104 views 1 answer
asked Mar 20, 2018 by anonymous
As the load is increased the speed of D.C. shunt motor will?
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
asked Mar 20, 2018 by anonymous
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be?
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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304 views 1 answer
asked Mar 20, 2018 by anonymous
The condition for maximum power in case of D.C. motor is?
Description :

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84 views 0 answers
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