What is the function of induction motor?

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asked Mar 17, 2018 by anonymous

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asked Mar 17, 2018 by anonymous

What is the definition of induction motor?

Last answer: its working on magnetic base made by coils and its work with 1 phase or 3 phase ac or dc supply

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asked Mar 3, 2018 by anonymous

What is mean by plugging in three phase induction motor?

Last answer: Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.

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asked Apr 29, 2018 by anonymous

The function of a brush and commutator arrangement in a dc motor is to

The function of a brush and commutator arrangement in a dc motor is to (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

Last answer: The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque

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1.4k views 1 answer

asked May 1, 2018 by anonymous

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

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

Last 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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214 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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119 views 1 answer

asked Apr 29, 2018 by anonymous

The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is

Last answer: The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 4 percent

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172 views 1 answer

asked Mar 20, 2018 by anonymous

After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?

Last answer: Reason is kinetic energy

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131 views 2 answers

asked Mar 20, 2018 by anonymous

If starting winding of a single-phase induction motor is left in the circuit, it will?

Last 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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186 views 1 answer

asked Mar 3, 2018 by anonymous

At which time power factor of the induction motor is low?

Last answer: The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.

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135 views 1 answer

asked May 7, 2020 by anonymous

State the function of following parts in Induction motor. (i) Stator (ii) Slip rings

Last answer: Name of part Function Stator 1) Stator frame supports the core, terminal box and protects the inner parts. 2) Stator core houses stator winding. 3) Stator winding ... ) Provides facility to connect external resistance to rotor circuit through brushes for starting and control.

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53 views 1 answer

asked Apr 28, 2018 by anonymous

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW.

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

Last answer: An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is 83.33 kW

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129 views 1 answer

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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69 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

asked Apr 29, 2018 by anonymous

A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for

Last answer: A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for 4 poles

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117 views 1 answer

asked Apr 28, 2018 by anonymous

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

Last answer: In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction

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75 views 1 answer

asked Apr 28, 2018 by anonymous

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

Last answer: The torque developed by any 3-phase induction motor at 0.8 p.u. slip is unstable torque

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2.9k 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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103 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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108 views 1 answer

asked May 8, 2018 by anonymous

In a double squirrel cage induction motor, good starting torque is produced as

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

Last answer: In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

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92 views 1 answer

asked Mar 17, 2018 by anonymous

How is a three phase cage induction motor self starting?

Last answer: Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting

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95 views 1 answer

asked Mar 17, 2018 by anonymous

Is induction motor is self starting?

Last answer: Single phase induction motor is not self starting. Three phase induction motor is self starting.

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89 views 1 answer

asked Sep 9, 2017 by anonymous

is induction motor ac or dc?

Last answer: Induction motor is a AC motor it is also known as asynchronous motor .

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73 views 1 answer

asked May 8, 2018 by anonymous

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

Last answer: A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque

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197 views 1 answer

asked Apr 28, 2018 by anonymous

In a split-phase induction motor, the resistance/reactance ratios of windings are such that

In a split-phase induction motor, the resistance/reactance ratios of windings are such that (A) current in the auxiliary winding leads the current in the main winding (B) current in the auxiliary winding lags the current in the main winding (C) both windings develop the same starting torque (D) both windings develop high starting current

Last answer: In a split-phase induction motor, the resistance/reactance ratios of windings are such that current in the auxiliary winding leads the current in the main winding

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71 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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696 views 2 answers

asked Oct 24, 2017 by anonymous

explain the working of single phase induction motor.

Last answer: Stator has two winding namely main winding and auxiliary winding.when single phase ac supply is given to the motor,its produces alternating field.this field cut by a cage rotor.so some emf ... due to this emf,rotor flux produced.the interaction between two fluxes produce torque.so rotor rotates.

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106 views 1 answer

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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198 views 2 answers

asked Mar 20, 2018 by anonymous

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it?

Last answer: The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

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119 views 1 answer

asked Sep 20, 2018 by anonymous

Split phase induction motor

Last answer: Split phase induction motor : There are two windings used in split phase induction motor. It is a type of single-phase induction motor. There are two winding one is called main winding and ... motor have low starting torque it is used for small fans, blowers, centrifugal pumps, grinders etc.

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179 views 1 answer

asked Mar 17, 2018 by anonymous

How does a single phase induction motor work?

Last answer: As we know that single phase induction is not self started because for self started we require atleast two revolving field but single phase induction motor has only one. So we provide extra ... 1phase IM classified as split phase IM, capacitor start capacitor run, capacitor start induction run.

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92 views 1 answer

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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93 views 1 answer

asked Sep 9, 2017 by anonymous

can induction motor be used as generator?

Last answer: if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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51 views 1 answer

asked Aug 9, 2017 by anonymous

Induction motor

Last answer: Induction Motor Inductor is a coil of wire which possess the property of inductance. Inductance is the property of an electric conductor which generate electromotive force (EMF ... motor are classified as slip ring induction motor and squirrel cage induction motor.

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53 views 1 answer

asked Aug 9, 2017 by anonymous

Single Phase Induction Motor

Last answer: Single Phase Induction Motor Single phase induction motor is mostly used in home, office, shop and many single phase appliances like pumps, ... torque and silent operation. It is uses where silent operation is required.

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453 views 1 answer

asked Apr 29, 2018 by anonymous

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

Last answer: What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

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79 views 1 answer

asked Aug 18, 2019 by anonymous

What will happen if the induction motor runs at synchronous speed ?

Last answer: Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed

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76 views 3 answers

asked May 22, 2020 by anonymous

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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34 views 1 answer

asked May 3, 2018 by anonymous

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

Last answer: The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be 0.5 Ohm

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124 views 1 answer

asked Mar 20, 2018 by anonymous

The repulsion start induction run motor is used because of?

Last answer: The repulsion-start induction-run motor is used because of high starting torque.

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61 views 1 answer

asked Mar 20, 2018 by anonymous

The power factor of a single-phase induction motor is usually?

Last answer: The power factor of a single-phase induction motor is usually lagging.

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102 views 1 answer

asked Apr 29, 2018 by anonymous

In a single-phase induction motor, the operating direction is determined by the ________

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

Last answer: In a single-phase induction motor, the operating direction is determined by the Starting circuit

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78 views 1 answer

asked Mar 20, 2018 by anonymous

A single-phase induction motor is?

Last answer: A single-phase induction motor is inherently non-self-starting with low torque.

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50 views 1 answer

asked Mar 20, 2018 by anonymous

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Last answer: A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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100 views 1 answer

asked Mar 15, 2018 by anonymous

Why starter is required for starting an induction motor?

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93 views 0 answers

asked May 22, 2020 by anonymous

Explain the working principle of induction motor.

Last answer: Working principle of induction motor: * When the motor is excited with three-phase supply, three-phase stator winding carries three-phase currents & produces a rotating magnetic field of constant magnitude and ... , which tend to move the rotor in the same direction as the rotating magnetic field.

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42 views 1 answer

asked May 7, 2020 by anonymous

Explain the activities carried out during weekly maintenance of 3 ph. Induction motor.

Last answer: Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor: 1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve ... and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.

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78 views 1 answer

asked Apr 27, 2020 by anonymous

With a neat sketch give the working of shaded pole induction motor.

Last answer: Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.

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113 views 2 answers

asked Jul 30, 2019 by anonymous

Explain the working of a single phase capacitor start induction motor.

Last answer: Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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150 views 2 answers

asked Mar 26, 2018 by anonymous

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

Last answer: The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

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65 views 1 answer

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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119 views 2 answers

mymukund · Answer 1 · 2018-03-17T12:54:02+0000

answered Mar 17, 2018 by mymukund

while you give supply to motor its motor run on magnet base

What is the function of induction motor?

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