The electric motor used in portable drills is?

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1 Answer

Answer :

The electric motor used in portable drills is universal motor.

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The motor used for electric traction is

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Last Answer : The motor used for electric traction is D.C. series motor

Where are portable screw compressors used?

Description : Where are portable screw compressors used?

Last Answer : Where are portable screw compressors used? The use of a portable screw air compressor in road, construction, mining and installation works indicates that its area of practical use is ... with these important, but fairly simple requirements will significantly lengthen the life of your compressor.

Describe the reason of using dc series motor for electric trains.

Description : Describe the reason of using dc series motor for electric trains.

Last Answer : Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the train picks up ... torque - speed characteristics of DC series motors match, these motors are suitable for electric trains

The power mentioned on the name plate of an electric motor indicates?

Last Answer : The power mentioned on the name plate of an electric motor indicates the output power available at the shaft.

Badminton Drills

Description : Badminton Drills

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The motor used for the compressors is?

Last Answer : The motor used for the compressors is capacitor-start capacitor-run motor.

The shaded pole motor is used for?

Last Answer : The shaded pole motor is used for low starting torque.

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.

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

The storage battery generally used in electric power stations is

Description : The storage battery generally used in electric power stations is  (1) zinc carbon battery (2) lead acid battery (3) nickel cadmium battery (4) lithium -ion battery

Last Answer : The storage battery generally used in electric power stations is lead acid battery 

How can a magnetic field be used to generate an electric current?

Description : How can a magnetic field be used to generate an electric current?

Last Answer : Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

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

Description : 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.

What is an electric motor drive?

Description : What is an electric motor drive?

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How does an electric motor works?

Description : How does an electric motor works?

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What is the use of an electric motor?

Description : What is the use of an electric motor?

Last Answer : Electrical motors are use for converting electrical energy to mechanical energy. It may be use in fans, pumps, washing machine, cranes, trains, factories, industries etc.

Portable Cement Mixers

Description : Portable Cement Mixers

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Mini Portable Cement Mixers

Description : Mini Portable Cement Mixers

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How to Make a Portable Water Purifier

Description : How to Make a Portable Water Purifier

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In a portable instrument, the controlling torque is provided by?

Last Answer : In a portable instrument, the controlling torque is provided by spring.

State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them.

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

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State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor

Description : State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

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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.

In a two value capacitor motor, the capacitor used for running purposes is?

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The motor used on small lathes is usually?

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A shaded pole motor can be used for?

Last Answer : A shaded pole motor can be used for toys, hair dryers, circulators etc.

A centrifugal switch is used to disconnect starting winding when motor has?

Last Answer : A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

The damping winding in synchronous motor is generally used to?

Description : The damping winding in synchronous motor is generally used to?

Last Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

Which type of motor is used in lift?

Description : Which type of motor is used in lift?

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If you were to be personified as a hand tool, I.E. combination wrench, screwdriver, etc. what tool would you be?

Description : If you were to be personified as a hand tool, I.E. combination wrench, screwdriver, etc. what tool would you be?

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A _________ is used to measure the stator % winding temperature of the generator.

Description : A _________ is used to measure the stator % winding temperature of the generator.  (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer

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Peterson coil is used for :

Description : Peterson coil is used for :  (A) shunt compensation of lines (B) grounding of system neutral (B) reduce fault currents (D) connecting interconnected systems

Last Answer : Peterson coil is used for : grounding of system neutral

Stepper motors are used in

Description : Stepper motors are used in  (1) printers (2) lifts (3) amplifiers (4) oscillators

Last Answer : Stepper motors are used in printers 

In a dc machine, interpoles are used to

Description : In a dc machine, interpoles are used to  (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Last Answer : In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

In D.C. machines fractional pitch winding is used?

Last Answer : In D.C. machines fractional pitch winding is used to reduce the sparking.

Starters are used with D.C. motors because?

Last Answer : Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.

The capacitors used in single-phase capacitor motors have no?

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Split phase induction motor

Description : Split phase induction motor

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

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

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Damper winding in a synchronous motor

Description : Damper winding in a synchronous motor

Last Answer : Damper winding in a synchronous motor Serves to start the motor.

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

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 ... the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

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

Description : 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

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance

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

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

Description : 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

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

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

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 

The number of poles of 8/6 stepper motor can be :

Description : The number of poles of 8/6 stepper motor can be :

Last Answer : The number of poles of 8/6 stepper motor can be : 4

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

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 :

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

For using regenerative breaking, the most suitable motor is :

Description : For using regenerative breaking, the most suitable motor is :  (A) DC series motor  (B) Slip ring induction motor  (C) Squirrel cage induction motor  (D) Synchronous motor

Last Answer : For using regenerative breaking, the most suitable motor is : Slip ring induction motor

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

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

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

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

Description : 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

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

Description : 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