Which motor has the poorest speed control?

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asked Mar 20, 2018 by anonymous

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asked May 1, 2018 by anonymous

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Last answer: The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

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The speed control of universal motor used for sewing machines is by?

Last answer: The speed control of universal motor used for sewing machines is by varying the resistance.

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asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

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Speed control of a universal motor is achieved by?

Last answer: Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

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asked Aug 9, 2017 by anonymous

speed control methods of three phase induction motor?

Last answer: Speed control of three phase induction motor

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asked Oct 13, 2019 by anonymous

Speed control of the motor using TRIAC

Last answer: Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

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asked Mar 20, 2018 by anonymous

Usually wide and sensitive speed control is desired in case of?

Last answer: Usually wide and sensitive speed control is desired in case of colliery winders.

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asked Mar 20, 2018 by anonymous

Speed control by Ward Leonard method gives uniform speed variation?

Last answer: Speed control by Ward Leonard method gives uniform speed variation in both directions.

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asked Mar 20, 2018 by anonymous

For constant torque drive which speed control method is preferred ?

Last answer: For constant torque drive armature voltage control speed control method is preferred.

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asked Mar 20, 2018 by anonymous

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

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

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asked Mar 20, 2018 by anonymous

In Ward-Leonard control the lower limit of speed is imposed by?

Last answer: In Ward-Leonard control the lower limit of speed is imposed by residual magnetism of the generator.

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asked Mar 15, 2018 by anonymous

Which motor has the best speed regulation?

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asked Mar 20, 2018 by anonymous

The armature voltage control of D.C. motor provides?

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

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asked Aug 9, 2017 by anonymous

Armature control of DC motor

Last answer: Armature control of DC motor

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asked Aug 9, 2017 by anonymous

Field control of DC motor

Last answer: Field control of DC motor

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asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

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

Last 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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asked Apr 28, 2018 by anonymous

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

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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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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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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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106 views 1 answer

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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asked Mar 20, 2018 by anonymous

The speed of a universal motor is usually reduced by using?

Last answer: The speed of a universal motor is usually reduced by using gearing.

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78 views 1 answer

asked Mar 20, 2018 by anonymous

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?

Last answer: In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

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asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last answer: Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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139 views 1 answer

asked Mar 20, 2018 by anonymous

The speed/load characteristics of a universal motor is same as that of?

Last answer: The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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69 views 1 answer

asked Mar 20, 2018 by anonymous

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?

Last answer: 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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asked Mar 15, 2018 by anonymous

Why the speed of synchronous motor is constant?

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asked Mar 20, 2018 by anonymous

In variable speed motor?

Last answer: In variable speed motor a weaker commutating field is needed at low speed than at high speed.

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asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, speed is?

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

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asked Mar 20, 2018 by anonymous

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

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

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asked Mar 18, 2018 by anonymous

An electric motor in which both stator field and rotor rotates with same speed is called?

Last answer: An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.

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asked Mar 18, 2018 by anonymous

Synchronous motor always runs at which speed?

Last answer: Synchronous motor always runs at synchronous speed.

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asked Jul 5, 2019 by anonymous

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 Apr 28, 2018 by anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

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

Last 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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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 20, 2018 by anonymous

The speed of a universal motor is generally reduced by using?

Last answer: The speed of a universal motor is generally reduced by using gear trains.

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asked Mar 20, 2018 by anonymous

The operating speed of a synchronous motor can be changed to new fixed value by?

Last answer: The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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asked Mar 18, 2018 by anonymous

If we change the excitation of synchronous machine will it affect on motor speed?

Last answer: No, If we change the excitation of synchronous machine it will not affect on motor speed.

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70 views 1 answer

asked Mar 15, 2018 by anonymous

How do you measure the speed of a motor?

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asked Dec 31, 2017 by anonymous

The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

Last answer: Ns equals f/pair pole 50/4 - 12.5

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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 Sep 13, 2017 by anonymous

which single phase induction motor has highest starting torque?

Last answer: Capacitor start motor has high torque in starting

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asked May 1, 2018 by anonymous

The fall in speed of a dc generator due to increase in load can be corrected by

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

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

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asked Mar 20, 2018 by anonymous

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?

Last 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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146 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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305 views 1 answer

asked Apr 28, 2018 by anonymous

A 3-phase, 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The rotating field produced by the rotor

A 3-phase, 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The rotating field produced by the rotor rotates at a speed of ________ rpm with respect to stator field. (A) 1500 (B) 0 (C) 1440 (D) 60

Last answer: 0

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690 views 2 answers

asked Apr 28, 2018 by anonymous

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω

Last answer: In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is 0.3 Ω

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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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148 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?

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 26, 2018 by anonymous

Under constant load conditions, the speed of a d.c. motor is affected by?

Last answer: Under constant load conditions, the speed of a d.c. motor is affected by field flux.

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208 views 1 answer

anonymous · Answer 1 · 2018-03-20T20:53:37+0000

answered Mar 20, 2018 by anonymous

Series motor has the poorest speed control.

Which motor has the poorest speed control?

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