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what is a pony motor ?
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pony motor is a small induction motor
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Description :

A pony motor is basically a?

Answer :

Pony motor is basically a small induction motor.

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Description :

The hybrid between horse and donkey is called (1) Pony (2) Colt (3) Mule (4) Zebra

Answer :

Mule

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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 :

What is the RPM of a DC motor?

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Description :

Answer :

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

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165 views 1 answer
Description :

What is the definition of induction motor?

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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106 views 1 answer
Description :

What is the function of induction motor?

Answer :

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

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131 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 :

What are the parts of AC motor?

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Description :

What is the principle of synchronous motor?

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Description :

What is the use of synchronous motor?

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64 views 0 answers
Description :

What is the principle of AC motor?

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59 views 0 answers
Description :

What is mean by plugging in three phase induction motor?

Answer :

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

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132 views 1 answer
Description :

What are the speed control methods of dc motor?

Answer :

Field control of DC motor Armature control of DC motor

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158 views 2 answers
Description :

what is separately excited motor ?

Answer :

the field winding have different source power supply and armature have different power supply source

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70 views 1 answer
Description :

AC motor

Answer :

AC motor AC motor have two types one is Induction motor and second is synchronous motor. Induction motor have two types one is single phase induction motor and second is three phase ... self starting motor so using  external motor or we have to start it as induction motor.

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77 views 1 answer
Description :

what are the types of dc motor?

Answer :

1.Separately excited dc motors 2.self excited dc motors self excited dc motors are further classified into a)dc series motor b) dc shunt motor c)dc compound motor - in compound motors there are two types i.cummulative compound dc motor ii.diffirential compound dc motor

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130 views 1 answer
Description :

what is the difference between synchronous and asynchronous motor?

Answer :

Asynchronous motors and syncrouns motor are called as dc machines.  and also syncrouns motor called as induction motor. Asynonymous motor as are rotates with constant speed we not able to operate . ... It is able to operate. These are a small difference between syncrouns and asynchronous motors. 

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248 views 2 answers
Description :

The heating time constant of a totally enclosed motor is relatively Select one: a. higher b. lower c. independent of type of enclosure. d. small .

Answer :

B

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154 views 1 answer
Description :

The efficiency of a 3-phase, star connected synchronous motor is 95% and it takes 24A at full load and unity power factor. What will be the induced e.m.f. if total mechanical power developed at full load and 0.9 power factor leading is 14620W. The synchronous impedance per phase is (0.2+j2) Ω.

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144 views 0 answers
Description :

A 200 V dc motor takes a field current of 2 A to generate a back emf of 180 V. If the field winding resistance is 80 Ω, the resistance of the shunt field regulator is (A) 10 Ω (B) 20 Ω (C) 100 Ω (D) 180 Ω

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71 views 0 answers
Description :

As the speed increases, the torque developed by a dc servo motor (A) decrease with a negative slope (B) increases with a positive slope (C) remain constant (D) becomes unstable 

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63 views 0 answers
Description :

The starting torque of a V/f controlled inverter-fed 3-phase induction motor operating at 25 Hz as compared with the same motor operating at 50 Hz is (A) more (B) double (C) equal (D) less 

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Description :

 As compared to a split phase motor, a capacitor start motor has _____.

Answer :

 As compared to a split phase motor, a capacitor start motor has higher starting torque.

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69 views 1 answer
Description :

For a 1.8o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is  (A) 15 (B) 30 (C) 60 (D) 90

Answer :

For a 1.8o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is 30 

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449 views 1 answer
Description :

The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be  (A) 48.0% (B) 57.1% (C) 59.2% (D) 88.8%

Answer :

The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 48.0%

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305 views 1 answer
Description :

The following motor definitely has a permanent magnet rotor  (A) DC commutator motor (B) Brushless dc motor (C) Stepper motor (D) Reluctance motor

Answer :

The following motor definitely has a permanent magnet rotor Stepper motor

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236 views 1 answer
Description :

A 400 V, 50 Hz 30 hp, three-phase induction motor is drawing 50 A current at 0.8 power factor lagging. The stator and rotor copper losses are 1.5 kW and 900 W respectively. The friction and windage losses are 1050 W and the core losses are 1200 W. The air-gap power of the motor will be (A) 23.06 kW (B) 24.11 kW (C) 25.01 kW (D) 26.21 kW

Answer :

A 400 V, 50 Hz 30 hp, three-phase induction motor is drawing 50 A current at 0.8 power factor lagging. The stator and rotor copper losses are 1.5 kW and 900 W respectively. The friction and windage losses are 1050 W and the core losses are 1200 W. The air-gap power of the motor will be 25.01 kW

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270 views 1 answer
Description :

In a stepper motor, the detent torque means  (A) minimum of the static torque with the phase winding excited (B) maximum of the static torque with the phase winding excited (C) minimum of the static torque with the phase winding unexcited (D) maximum of the static torque with the phase winding unexcited

Answer :

In a stepper motor, the detent torque means maximum of the static torque with the phase winding unexcited

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632 views 1 answer
Description :

The locked rotor current in a 3-phase, star connected 15 , kW 4 , pole 230 V , 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor is connected to a 236 , V 57 Hz supply is  (A) 58.5 A (B) 45.0 A (C) 42.7 A (D) 55.6 A

Answer :

The locked rotor current in a 3-phase, star connected 15 , kW 4 , pole 230 V , 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor is connected to a 236 , V 57 Hz supply is 45.0 A 

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385 views 1 answer
Description :

The torque speed characteristic of a repulsion motor resembles which of the following d.c. motor characteristics  A) Separately excited B) Shunt C) Series D) Compound

Answer :

The torque speed characteristic of a repulsion motor resembles which of the following d.c. motor characteristics Series 

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463 views 1 answer
Description :

In a Synchronous motor, the magnitude of stator back e.m.f (Eb) depends on

Answer :

In a Synchronous motor, the magnitude of stator back e.m.f (Eb) depends on DC excitation only

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147 views 1 answer
Description :

When running under no-load condition and with over excitation, armature current Ia drawn by a synchronous motor

Answer :

When running under no-load condition and with over excitation, armature current Ia drawn by a synchronous motor Leads the applied voltage

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288 views 1 answer
Description :

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

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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324 views 1 answer
Description :

Damper winding in a synchronous motor

Answer :

Damper winding in a synchronous motor Serves to start the motor.

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64 views 1 answer
Description :

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.

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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103 views 1 answer
Description :

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

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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305 views 1 answer
Description :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

Answer :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

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196 views 1 answer
Description :

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

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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134 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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83 views 1 answer
Description :

Slip test is performed to determine :  (A) Slip in an induction motor  (B) Xd and Xq in a salient pole alternator  (C) Synchronous impedance in an alternator  (D) Positive and negative sequence impedances of an alternator

Answer :

Slip test is performed to determine :  Xd and Xq in a salient pole alternator 

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87 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 :

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

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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170 views 1 answer
Description :

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

Answer :

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

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1.7k views 1 answer
Description :

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

Answer :

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm

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132 views 1 answer
Description :

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

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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88 views 1 answer
Description :

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

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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81 views 1 answer
Description :

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Answer :

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

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85 views 1 answer
Description :

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Answer :

The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

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436 views 1 answer
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