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

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asked Mar 20, 2018 by anonymous

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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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Speed control of a universal motor is achieved by?

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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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A universal motor can run on?

Last answer: A universal motor can run on either A.C. or D.C.

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The direction of rotation of universal motor can be reversed the by reversing the flow of current through?

Last answer: The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.

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asked Apr 16, 2020 by anonymous

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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In a universal motor, the most common cause of brush sparking is?

Last answer: In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.

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asked Mar 20, 2018 by anonymous

A universal motor is one which?

Last answer: A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.

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asked Aug 17, 2019 by anonymous

State working principle of universal motor with the help of diagram.

Last answer: Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply.

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asked Aug 17, 2019 by anonymous

applications of each: i) Universal motor ii) Stepper motor.

Last answer: i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters

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asked Jul 26, 2019 by anonymous

State two applications of 1) Shaded pole motor 2) Universal motor

Last answer: (i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.

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asked Jul 20, 2019 by anonymous

Draw and explain working of universal motor. Give two applications of universal motor.

Last answer: Figure of Universal motor: Operation of universal motor on A.C. and D.C. supply: *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.

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254 views 4 answers

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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209 views 1 answer

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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asked Apr 28, 2018 by anonymous

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

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Last answer: The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 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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115 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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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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83 views 1 answer

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 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

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

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 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 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 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 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 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

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 15, 2018 by anonymous

Why the speed of synchronous motor is constant?

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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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92 views 1 answer

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

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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69 views 1 answer

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 Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

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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 Mar 20, 2018 by anonymous

Which motor has the poorest speed control?

Last answer: Series motor has the poorest speed control.

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79 views 1 answer

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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115 views 1 answer

asked Mar 15, 2018 by anonymous

Which motor has the best speed regulation?

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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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45 views 1 answer

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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59 views 1 answer

asked Apr 28, 2018 by anonymous

Corona loss in transmission lines can be reduced by

Corona loss in transmission lines can be reduced by (A) using small diameter conductors (B) using bundled conductors (C) using less spacing between conductors (D) increasing the transmission line voltage

Last answer: Corona loss in transmission lines can be reduced by using bundled conductors

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95 views 1 answer

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 10, 2018 by anonymous

How can power loss be reduced?

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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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asked Mar 21, 2018 by anonymous

A universal RLC bridge uses?

Last answer: A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

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asked Apr 28, 2018 by anonymous

In an adjustable speed ac drive which quantity gets reduced above rated speed ?

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

Last answer: In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

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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?

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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142 views 1 answer

asked Apr 29, 2018 by anonymous

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to

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

Last 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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91 views 1 answer

anonymous · Answer 1 · 2018-03-20T19:19:40+0000

answered Mar 20, 2018 by anonymous

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

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

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