How Many Types Of Electric Motors Are There?

How Many Types Of Electric Motors Are There?
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1 Answer

Answer :

Mainly there are two types of electric motors:

AC motors
DC motors
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Related questions

Universal motors will operate on AC or DC current, and are generally found in _____________. A. portable tools B. large pump motors C. turbo electric main motors D. forced draft fans

Description : Universal motors will operate on AC or DC current, and are generally found in _____________. A. portable tools B. large pump motors C. turbo electric main motors D. forced draft fans

Last Answer : Answer: A

Electric motors intended for use outside the engine room and boiler room are frequently rated to run at a designed ambient temperature of 40°C. What is the equivalent temperature in degrees Fahrenheit? A. 54.2°F B. 72.0°F C. 104.0°F D. 129.6°F

Description : Electric motors intended for use outside the engine room and boiler room are frequently rated to run at a designed ambient temperature of 40°C. What is the equivalent temperature in degrees Fahrenheit? A. 54.2°F B. 72.0°F C. 104.0°F D. 129.6°F

Last Answer : Answer: C

The failure of ball bearings used in electric motors can result from _____________. A. failure to clean the bearing before repacking B. failure to maintain proper alignment C. excess lubrication forcing the bearing full of grease and eliminating all areas of expansion D. all of the above

Description : The failure of ball bearings used in electric motors can result from _____________. A. failure to clean the bearing before repacking B. failure to maintain proper alignment C. excess lubrication forcing the bearing full of grease and eliminating all areas of expansion D. all of the above

Last Answer : Answer: D

When disassembling electric motors for maintenance or overhaul, ________________. A. punch mark frame and end bells for proper assembly B. wrap bearings in lint free cloths if they are to be reused C. tag and store small parts in a box D. all of the above

Description : When disassembling electric motors for maintenance or overhaul, ________________. A. punch mark frame and end bells for proper assembly B. wrap bearings in lint free cloths if they are to be reused C. tag and store small parts in a box D. all of the above

Last Answer : Answer: D

Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions? A. Sealed motors B. Drip proof motors C. Enclosed motors D. Watertight motors

Description : Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions? A. Sealed motors B. Drip proof motors C. Enclosed motors D. Watertight motors

Last Answer : Answer: D

What Is Electric Motors?

Description : What Is Electric Motors?

Last Answer : An electric motor is an electrochemical device that converts electrical energy into mechanical energy. Most electric motors operate through the interaction of magnetic field and current carrying conductors to generate force.

How many types of electric motors ?

Description : How many types of electric motors ?

Last Answer : 2 types of electric motors.

State types of enclosures for electric motors.

Description : State types of enclosures for electric motors. 

Last Answer : Types of enclosures for Electric Motor:  i) Open type enclosure:-  ii) Screen Protected enclosure  iii) Drip proof (moisture) enclosure:  iv) Flame (Fire) proof enclosure:-  v) Totally enclosed type enclosure:-  vi) Pipe ventilated totally enclosed type enclosure:

As shown in the illustration, the electrical symbol is used to indicate which of the listed types of motors? EL-0054 A. Shunt motor. B. Series motor. C. Compound motor. D. Tri-field motor.

Description : As shown in the illustration, the electrical symbol is used to indicate which of the listed types of motors? EL-0054 A. Shunt motor. B. Series motor. C. Compound motor. D. Tri-field motor.

Last Answer : Answer: C

Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Description : Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Last Answer : Answer: B

Which of the following types of motors is often designed for use in correcting power factor? A. Polyphase B. Wound-rotor C. Induction D. Synchronous

Description : Which of the following types of motors is often designed for use in correcting power factor? A. Polyphase B. Wound-rotor C. Induction D. Synchronous

Last Answer : Answer: D

Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Last Answer : A: Following motors are used: - Vacuum cleaners- Universal motor. Phonographic appliances - Hysteresis motor. Vending machines - Shaded pole motor. Refrigerators - Capacitor split phase ... Cumulative motors. Lathes - DC shunt motors. Power factor improvement - Synchronous motors.

Name types of 1-phase induction motors.

Description : Name types of 1-phase induction motors.

Last Answer : Based on the method of starting arrangement provided, the 1-phase Induction motors are classified as follows (i) Split-phase motor (ii) Shaded pole motor (iii) Resistor start Induction run ... iv) capacitor start Induction run single phase IM (v) capacitor start Capacitor run single phase IM

How many types of DC motors are there?

Description : How many types of DC motors are there?

Last Answer : DC shunt motor: shunt motor speed varies slightly from no load to full load. DC series motor: series motor speed varies greatly as load changes. DC compound motor: the compound motor ... characteristics provided by the series field, while the shunt field provides for a relatively constant speed. 

What are the types of bearings are adopted for small motors and large motors?

Description : What are the types of bearings are adopted for small motors and large motors?

Last Answer : Small motors (LT motors) Horizontal mounted - deep groove ball bearing at both ends. Medium motors Roller bearing at DE and deep groove bearing at NDE. Large motors (HT motors above 750 kW) Horizontal ... mounted - face to face angular contact ball bearing at NDE and roller or ball bearing at DE.

What are the types of AC three phase motors?

Description : What are the types of AC three phase motors?

Last Answer : Mainly there are two types. 1. Synchronous motors. a. Plain synchronous motors. b. Auto synchronous motors. 2. A-synchronous motors. a. Induction motors. 1. Single phase motors Shaded pole motor. ... universal motor. 2. 3φ commutator motors. 3φ series motor Charge motor. Compensated motor.

Explain different types of D.C motors? Give their applications

Description : Explain different types of D.C motors? Give their applications

Last Answer : Different type of DC motors and their applications are as follows:- Shunt motors: It has a constant speed though its starting torque is not very high. Therefore, it is suitable for constant ... , conveyor, rolling mill, planes, presses, shears and punches, coal cutter and winding machines etc.

Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Last Answer : Following motors are used: - Vacuum cleaners- Universal motor. Phonographic appliances - Hysteresis motor. Vending machines - Shaded pole motor. Refrigerators - Capacitor split phase ... Cumulative motors. Lathes - DC shunt motors. Power factor improvement - Synchronous motors.

Are electric motors used in the refrigerator!

Description : Are electric motors used in the refrigerator!

Last Answer : Do you have a plug that you insert into a wall socket? If so, then yes.

Where can I find electric motors online?

Description : Where can I find electric motors online?

Last Answer : One online store you can buy electric motors at is "ElectricMotors.com" They have a pretty good range of motors to choose from like jet pump, compressors, conveyors and pool motors.

Do surplus electric motors normally not work very well?

Description : Do surplus electric motors normally not work very well?

Last Answer : Surplus electric motors do usually work very well. I am thinking that you could have accidentally broken it when you bought it. I would bring it back to the store just in case!

Can you still get up and go with electric car motors?

Description : Can you still get up and go with electric car motors?

Last Answer : Most electric cars have a top speed limit of around 70mph. I would find a dealership, and then I would contact someone in customer service with any questions. They should be able to assist you and point you in the right direction.

Which of the following is not a source of industrial noise? A. Automobile ignition B. Sun C. Electric Motors D. Leakage from high voltage line

Description : Which of the following is not a source of industrial noise? A. Automobile ignition B. Sun C. Electric Motors D. Leakage from high voltage line

Last Answer : B. Sun

The compound of silicon used as insulating material for electric motors/appliances is

Description : The compound of silicon used as insulating material for electric motors/appliances is

Last Answer : silicone.

Match List -I (Bearings) with List-II (Applications) and select the using the codes given below the lists: [IAS-1998] List –I List-II A. Journal bearing 1. Electric motors B. Thrust bearing 2. Watches C. Conical pivot bearing 3. Marine engines D. Ball bearing 4. Swivelling chairs A B C D A B C D (a) 3 4 1 2 (b) 4 2 1 3 (c) 3 4 2 1 (d) 4 2 3 1

Description : Match List -I (Bearings) with List-II (Applications) and select the using the codes given below the lists: [IAS-1998] List -I List-II A. Journal bearing 1. Electric motors B. Thrust bearing 2. Watches C. Conical pivot bearing 3. Marine ... D (a) 3 4 1 2 (b) 4 2 1 3 (c) 3 4 2 1 (d) 4 2 3 1

Last Answer : (c) 3 4 2 1

Products on which labeling is voluntary are a) Electric geysers b) Induction motors b) Ceiling fans d) All of the above

Description : Products on which labeling is voluntary are a) Electric geysers b) Induction motors b) Ceiling fans d) All of the above

Last Answer : All of the above

DC motors converts electrical into ___ energy. A. Mechanical B. Wind C. Electric D. None

Description : DC motors converts electrical into ___ energy. A. Mechanical B. Wind C. Electric D. None

Last Answer : A. Mechanical  

Suggest electric motors for i) traction ii) crane iii) lathe machine iv) domestic fan.

Description : Suggest electric motors for i) traction ii) crane iii) lathe machine iv) domestic fan.

Last Answer : i) Traction :- DC Series motor  ii) Crane :- DC Series motor  iii) Lathe machine :- 3 phase Induction motor or DC shunt motor  iv) Domestic fan :- 1 phase induction motor

State which electric motors are generally used in electro agro systems with reason.

Description : State which electric motors are generally used in electro agro systems with reason.

Last Answer : 1) 3 phase induction motor is used in electro agro system for water pumping from wells as 3 phase ac supply is easily available, cost of induction motor is less, maintenance free being rugged ... as 1 phase ac supply is easily available for domestic purpose, repair is simple and easily available.

Define load equalisation for electric motors. Explain how it is obtained for electric motors.

Description : Define load equalisation for electric motors. Explain how it is obtained for electric motors.

Last Answer : Define load equalization for electric Motor: There are many types of load which are fluctuating in nature e.g. wood cutting m/c, Rolling mill. Etc. For such type of loads, load equalization is ... increases so cost of cable increases, Hence it is necessary to smooth out load fluctuations on motor.

Carbon brushes are used in electric motors to: ...

Description : Carbon brushes are used in electric motors to:  (1) Brush off carbon deposit on the commutator (2) Provide a path for flow of current (3) Prevent overheating of armature windings (4) Prevent sparking during commutation

Last Answer : Carbon brushes are used in electric motors to: Provide a path for flow of current.

The efficiencies of transformers compared with that of electric motors of the same power are?

Description : The efficiencies of transformers compared with that of electric motors of the same power are?

Last Answer : Transformers have high efficiency than the same ratted motors

Unless it can be shown that a 45°C ambient temperature will not be exceeded, motors within a machinery space must be designed for an ambient temperature of _____________. A. 45°C B. 50°C C. 55°C D. 60°C

Description : Unless it can be shown that a 45°C ambient temperature will not be exceeded, motors within a machinery space must be designed for an ambient temperature of _____________. A. 45°C B. 50°C C. 55°C D. 60°C

Last Answer : Answer: B

An advantage of DC motors over AC motors is that they _____________. A. are less expensive B. require less maintenance C. offer infinite speed variation D. all of the above

Description : An advantage of DC motors over AC motors is that they _____________. A. are less expensive B. require less maintenance C. offer infinite speed variation D. all of the above

Last Answer : Answer: C

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency? A. A four-pole synchronous motor under normal load. B. A four-pole induction motor under no load. C. A six-pole synchronous motor under normal load. D. A six-pole induction motor under full load.

Description : Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency? A. A four-pole synchronous motor under normal load. B. A four-pole induction motor under ... A six-pole synchronous motor under normal load. D. A six-pole induction motor under full load.

Last Answer : Answer: A

Which of the following is a characteristic of fractional horsepower repulsion start motors? A. They start with a rotating stator field. B. The short circuiting ring is removed from the commutator while starting. C. The brushes are removed from the commutator while starting. D. They have a low starting torque.

Description : Which of the following is a characteristic of fractional horsepower repulsion start motors? A. They start with a rotating stator field. B. The short circuiting ring is removed from the commutator while ... brushes are removed from the commutator while starting. D. They have a low starting torque.

Last Answer : Answer: B

Electrical failures in motors are caused by the breakdown of insulation, which may be caused by _____________. A. penetration of moisture B. accumulation of dirt C. overheating D. all of the above

Description : Electrical failures in motors are caused by the breakdown of insulation, which may be caused by _____________. A. penetration of moisture B. accumulation of dirt C. overheating D. all of the above

Last Answer : Answer: D

The armature cores of the D.C. motors are constructed with laminations to ___________. A. eliminate hysteresis B. minimize brush sparking C. reduce eddy current losses D. compensate for armature reaction

Description : The armature cores of the D.C. motors are constructed with laminations to ___________. A. eliminate hysteresis B. minimize brush sparking C. reduce eddy current losses D. compensate for armature reaction

Last Answer : Answer: C

Some large A.C. motors are equipped with with heaters. These could be ___________. I. resistance heaters bolted directly to the frame II. low voltage windings embedded in the motor windings A. I only B. II only C. either I or II D. neither I or II

Description : Some large A.C. motors are equipped with with heaters. These could be ___________. I. resistance heaters bolted directly to the frame II. low voltage windings embedded in the motor windings A. I only B. II only C. either I or II D. neither I or II

Last Answer : Answer: C

An overload in which of the listed motors will result in the illumination of an indicating light at the propulsion control station alarm panel? A. Fuel pump motor B. Steering motor C. Condensate pump motor D. Forced draft blower motor

Description : An overload in which of the listed motors will result in the illumination of an indicating light at the propulsion control station alarm panel? A. Fuel pump motor B. Steering motor C. Condensate pump motor D. Forced draft blower motor

Last Answer : Answer: B

In addition to undercutting the mica, proper maintenance of a D.C. motor's commutator includes _______________. A. side-cutting the copper segments and insulating the slots B. coating the copper surface with light machine oil for the first four hours of operation C. baking the armature in an oven at a maximum of 95°C for not over 8 hours D. all of the above

Description : In addition to undercutting the mica, proper maintenance of a D.C. motor's commutator includes _______________. A. side-cutting the copper segments and insulating the slots B. coating the copper surface with light machine ... in an oven at a maximum of 95°C for not over 8 hours D. all of the above

Last Answer : Answer: A

If a unloaded shunt motor's field were weakened by rheostat resistance or by an open circuit, the motor would _________. A. overspeed due to reduced CEMF B. stop because of low flux C. continue to run at base speed D. slow down and overheat

Description : If a unloaded shunt motor's field were weakened by rheostat resistance or by an open circuit, the motor would _________. A. overspeed due to reduced CEMF B. stop because of low flux C. continue to run at base speed D. slow down and overheat

Last Answer : Answer: A

All of the following items can be used in the maintenance of a D.C. propulsion motor's commutator EXCEPT _______________. A. a canvas wiper B. safety solvent C. abrasive dressing stones D. sandpaper

Description : All of the following items can be used in the maintenance of a D.C. propulsion motor's commutator EXCEPT _______________. A. a canvas wiper B. safety solvent C. abrasive dressing stones D. sandpaper

Last Answer : Answer: B

The armature cores of the D.C. motors are constructed with laminations to ___________. A. eliminate hysteresis B. minimize brush sparking C. reduce eddy current losses D. compensate for armature reaction

Description : The armature cores of the D.C. motors are constructed with laminations to ___________. A. eliminate hysteresis B. minimize brush sparking C. reduce eddy current losses D. compensate for armature reaction

Last Answer : Answer: C

Routine A.C. motor maintenance should include periodic ______________. A. thermometer readings at normal loads to detect abnormal temperature rises B. inspection of the motor's internals for loose rotor bars or field poles C. bearing replacement each year using sealed units if available D. all of the above

Description : Routine A.C. motor maintenance should include periodic ______________. A. thermometer readings at normal loads to detect abnormal temperature rises B. inspection of the motor's internals for loose rotor bars ... C. bearing replacement each year using sealed units if available D. all of the above

Last Answer : Answer: A

As shown in the illustration, the D.C. motor's direction of rotation in changed by changing the _________________. EL-0101 A. polarity of the generator field B. direction of three-phase motor rotation C. direction of generator rotation D. polarity of the motor field

Description : As shown in the illustration, the D.C. motor's direction of rotation in changed by changing the _________________. EL-0101 A. polarity of the generator field B. direction of three-phase motor rotation C. direction of generator rotation D. polarity of the motor field

Last Answer : Answer: A

Complete maintenance of electrical motors should include periodic checks for machine _____________. A. vibration B. watertight integrity C. speed droop D. reactive power

Description : Complete maintenance of electrical motors should include periodic checks for machine _____________. A. vibration B. watertight integrity C. speed droop D. reactive power

Last Answer : Answer: A

The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens useful life C. energy is wasted if full loading is not utilized D. power factor correction methods are load dependent

Description : The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens ... wasted if full loading is not utilized D. power factor correction methods are load dependent

Last Answer : Answer: B

In the construction of D.C. motors, parts of both the series and shunt fields are wound on the _____________. A. opposite main pole B. rotor core C. interpole D. same main pole

Description : In the construction of D.C. motors, parts of both the series and shunt fields are wound on the _____________. A. opposite main pole B. rotor core C. interpole D. same main pole

Last Answer : Answer: D