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

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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.

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

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Description :

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

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

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Answer :

The electric motor used in portable drills is universal motor.

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Description :

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

Answer :

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

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Description :

What is an electric motor drive?

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Description :

How does an electric motor works?

Answer :

In the electric motor there are two types of part 1)moving and 2)stationary In stationary part containing field winding whis use to provide uniform maganetic field it at inner side of yoke In moving ... on it and this force is from all direction we can say it is torque.and motor armature rotates

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108 views 1 answer
Description :

What is the use of an electric motor?

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.

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Description :

An _____________is a network of electrical components used to supply, transfer and use electric power:  (A) Electric power system (B) Electric power (C) All of the above (D) None of the above

Answer :

An Electric power system is a network of electrical components used to supply, transfer and use electric power.

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Description :

The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

Answer :

The motor used for electric traction is D.C. series motor

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Description :

Draw & explain touch plate switch using IC555.

Answer :

It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .

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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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Description :

Answer :

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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Description :

Answer :

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

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Description :

How can we improve power factor using synchronous motor?

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Description :

Answer :

Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

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Description :

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

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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Description :

Electric Power

Answer :

Electric Power

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Description :

State elements of diesel electric power plant with their functions. 

Answer :

Elements of Diesel Power Plant with their function):   1) Diesel Engine: - This is the main component of the P.P. which develops mechanical power. 2) Engine air intake system: - Air ... fuel as per requirement. 10) Alternator: - Its function is to convert mechanical power into electrical power.

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Description :

Options: A) WATT B) AMPERE C) VOLTS D) OHM

Answer :

Correct Answer: A) WATT

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Description :

Electric power formula

Answer :

Electric power formula

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Description :

"Hydro electric power station are not perennial power station". Justify.

Answer :

Justification: The water utilized by the hydro power plants comes mostly from storage dams/reservoirs which get filled up during the monsoon rainy season. Such reservoirs are utilized for supplying ... are important. Hence "Hydro electric power stations are not perennial power station" 

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Description :

Explain starting system in diesel electric power plant.

Answer :

Starting system in Diesel Electric Power Plant: It includes Storage battery, compressed air tanks, self-starter etc. The purpose of engine starting system is to rotate the engine initially while ... as Ammeters, Voltmeters, Wattmeters, Thermometers, Pressure gauges, Visible and audible alarm etc.

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Description :

Explain fuel system and air intake system in diesel electric power plant.

Answer :

Fuel system and air intake system in diesel electric power plant :  Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.

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Description :

State any four advantages and four disadvantages of diesel electric power plant. 

Answer :

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Description :

List out the four applications of diesel electric power plant.

Answer :

Applications of Diesel Power Plant: 1. It can be used as a standby (emergency) power plant to maintain continuity of supply. (Incase failure of main supply like hospital, Telephone exchange Radio stations, ... 10. Diesel plants are widely used for generating power ranging from 100 to 5,000 H.P.

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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

Answer :

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

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Description :

Power factor of electric bulb is?

Answer :

Power factor of electric bulb is unity.

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Answer :

Power for lighting in passanger coach, in a long distance electric train, is provided through individual generator of bogie and batteries.

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Answer :

In a steam locomotive electric power is provided through small turbo-generator.

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Answer :

By  use  of  thermocouple.

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Description :

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

Answer :

Transformers have high efficiency than the same ratted motors

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What is electric power generation transmission and distribution?

Answer :

Generation: it wrong word at here.because it is no generation it is conversion of one form of energy into electrical form.it may by using any type of energy. Transmission is just to ... place to other by providing some modifications And distribution means use of this energy for any purpose.

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Description :

what are the three different types of Electric power?

Answer :

Real,reactive,apparent power

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Description :

What is another name for an insulator?

Answer :

Dielectric material is another name for an insulator.

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Description :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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Description :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

Answer :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

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Description :

Answer :

An induction motor has relatively high power factor at near full load.

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Description :

Name two good conductors, two good insulators, and two semiconductors.

Answer :

In general all metals are good conductors, with silver the best and copper second.

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Description :

Explain energy conservation technique “by improving power quality” for induction motor.

Answer :

Energy conservation method in induction motor by improving power quality: Electrical energy can be conserved by improving the power quality. It can be achieved by avoiding voltage unbalance, maintaining ... losses can be minimized by using harmonic filter thus reducing the harmonics in the system.

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Description :

In a d.c. motor, the mechanical output power actually comes from?

Answer :

In a d.c. motor, the mechanical output power actually comes from electrical input power.

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1.1k views 1 answer
Description :

The mechanical power developed by the armature of a d.c. motor is equal to?

Answer :

The mechanical power developed by the armature of a d.c. motor is equal to armature current multiplied by back e.m.f.

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Description :

Answer :

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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Description :

Answer :

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

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Description :

Answer :

The value of starting capacitor of a fractional horse power motor will be 300 uF .

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Description :

If the load of the normally excited synchronous motor is increased the power factor will?

Answer :

If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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Description :

If the field of synchronous motor is under excited, power factor will be?

Answer :

If the field of synchronous motor is under excited, power factor will be lagging.

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Description :

The synchronous motor will develop maximum power when the load angle is?

Answer :

The synchronous motor will develop maximum power when the load angle is 900.

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Description :

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Answer :

Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

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Description :

Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative surface? A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity

Answer :

Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative ... A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity

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