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If a D.C. motor is to be selected for conveyors, Series motor would be preferred.

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Answer :

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

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

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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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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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213 views 1 answer
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If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

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

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120 views 1 answer
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For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.

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141 views 1 answer
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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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122 views 1 answer
Description :

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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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99 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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307 views 1 answer
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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
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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 :

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

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407 views 1 answer
Description :

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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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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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110 views 1 answer
Description :

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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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74 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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165 views 1 answer
Description :

Answer :

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

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100 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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229 views 1 answer
Description :

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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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102 views 1 answer
Description :

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

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82 views 1 answer
Description :

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

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Description :

Answer :

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

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118 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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60 views 1 answer
Description :

Answer :

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

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66 views 1 answer
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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117 views 1 answer
Description :

Answer :

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

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104 views 1 answer
Description :

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

Answer :

In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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265 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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138 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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79 views 1 answer
Description :

Answer :

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

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123 views 1 answer
Description :

Answer :

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

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121 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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383 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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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 :

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

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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Description :

Answer :

If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

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208 views 1 answer
Description :

Answer :

If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.

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128 views 1 answer
Description :

What will happen if you increase the current in the motor?

Answer :

Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor

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156 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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76 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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171 views 1 answer
Description :

Answer :

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

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121 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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145 views 1 answer
Description :

Answer :

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

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79 views 1 answer
Description :

Answer :

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

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

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56 views 1 answer
Description :

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

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120 views 1 answer
Description :

Answer :

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

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121 views 1 answer
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