D.C. motor is to a drive a load which is almost nil for certain part of the load cycle...

asked Mar 20, 2018 by anonymous

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the?

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answered Mar 20, 2018 by anonymous

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the compound motor.

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asked Mar 20, 2018 by anonymous

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value...

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the?

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If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?

Last 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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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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asked May 22, 2020 by anonymous

Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter.

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Last answer: Necessity of Starter for D.C. Motor: Armature current is given by equation Ia = (V−Eb)/Ra i) If the motor is at standstill or rest, back emf Eb is zero (as Eb= ZNP/(60A), at start speed N ... . Types of D.C. motor starters: i) Two point starter ii)Three point starter iii) Four point starter

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asked Mar 20, 2018 by anonymous

Which D.C. motor has got maximum self relieving property ?

Last answer: Series motor has got maximum self relieving property.

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asked Mar 26, 2018 by anonymous

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Last answer: The Eb/V ratio of a d.c. motor is an indication of its efficiency.

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asked Mar 26, 2018 by anonymous

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

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

Last answer: asked Mar 26, 2018 by anonymous The normal value of the armature resistance of a d.c. motor is?

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asked Mar 26, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

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

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asked Mar 20, 2018 by anonymous

If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?

Last 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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asked Mar 26, 2018 by anonymous

The counter e.m.f. of a d.c. motor?

The counter e.m.f. of a d.c. motor?

Last answer: The counter e.m.f. of a d.c. motor helps in energy conversion.

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asked Mar 26, 2018 by anonymous

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

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asked Mar 20, 2018 by anonymous

Torque developed by a D.C. motor depends upon?

Last 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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asked Jul 5, 2019 by anonymous

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

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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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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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

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

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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asked Mar 20, 2018 by anonymous

Which D.C. motor is generally preferred for cranes and hoists ?

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

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asked Mar 20, 2018 by anonymous

Which D.C. motor is preferred for elevators ?

Last answer: Cumulative compound D.C. motor is preferred for elevators.

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asked Mar 20, 2018 by anonymous

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

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

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107 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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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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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?

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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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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?

Last 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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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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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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asked Mar 20, 2018 by anonymous

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

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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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asked May 22, 2020 by anonymous

State at least one function and the material used for the following parts of DC Motor.

State at least one function and the material used for the following parts of DC Motor.

Last answer: Part Function Material Yoke -Provides mechanical support for poles -Acts as protecting cover for machine -Provides path for magnetic flux Cast Iron OR Cast Steel Field Winding - ... Pole core Provides mechanical support to field winding. Cast Iron OR Cast Steel

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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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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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305 views 1 answer

asked Mar 20, 2018 by anonymous

A.C. series motor as compared to D.C. series motor has?

Last 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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69 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?

Last 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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294 views 1 answer

asked Mar 20, 2018 by anonymous

Which D.C. motor has got maximum self loading property?

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

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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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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

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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93 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 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 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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113 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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110 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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171 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?

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

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376 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

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