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

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

2 Answers

Answer :

The efficiencies of transformers compared with that of electric motors of the same power are somewhat smaller.
by
edited

Answer :

Transformers have high efficiency than the same ratted motors
by

Related questions

Losses which occur in rotating electric machines and do not occur in transformers are?

Description : Losses which occur in rotating electric machines and do not occur in transformers are?

Last Answer : Friction losses windage losses 

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.

Classify the transformers based on the construction, frequency and power.

Description : Classify the transformers based on the construction, frequency and power.

Last Answer : Classification of Transformer Based On: i) Construction: Shell type, Core type, Berry type ii) Change in voltage level: Step-Up, Step-Down, iii) Number of phases: Single phase, Three phase iv) ... Control vi) Cooling: Self-cooled, Air-cooled, Forced-air cooled, Oil-cooled, Forced-oil cooled. 

The standard full-load power factor ratings for synchronous motors are?

Last Answer : The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

For power factor correction, synchronous motors operate at?

Last Answer : For power factor correction, synchronous motors operate at no-load and greatly over-excited fields.

Power transformers are generally designed to have maximum efficiency around?

Last Answer : Power transformers are generally designed to have maximum efficiency around near full-load.

Natural oil cooling is used for transformers up to a rating of?

Last Answer : Natural oil cooling is used for transformers up to a rating of 3000 kVA.

If the percentage impedances of the two transformers working in parallel are different, then?

Description : If the percentage impedances of the two transformers working in parallel are different, then?

Last Answer : If the percentage impedances of the two transformers working in parallel are different, then parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load.

Distribution transformers are generally designed for maximum efficiency around?

Last Answer : Distribution transformers are generally designed for maximum efficiency around 50% load.

Two transformers do not have equal percentage impedance. This is likely to result in?

Description : Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?

Last Answer : Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in loading of the transformers not in proportion to their kVA ratings.

Short circuit test on transformers is conducted to determine?

Last Answer : Short circuit test on transformers is conducted to determine copper losses.

For the parallel operation of single phase transformers it is necessary that they should have?

Last Answer : Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers:  1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.

Natural air cooling is generally restricted for transformers up to?

Last Answer : Natural air cooling is generally restricted for transformers up to 1.5 MVA .

The efficiency of two identical transformers under load conditions can be determined by?

Description : The efficiency of two identical transformers under load conditions can be determined by?

Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) :

Description : Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) :  (A) Sodium vapour lamp, Mercury vapour lamp, Neon lamp  (B) Neon lamp, Sodium vapour ... Mercury vapour lamp, Sodium vapour lamp  (D) Mercury vapour lamp, Sodium vapour lamp, Neon lamp

Last Answer : Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) :  (A) Sodium vapour lamp, Mercury vapour lamp, Neon lamp  (B) Neon lamp, Sodium ... Mercury vapour lamp, Sodium vapour lamp  (D) Mercury vapour lamp, Sodium vapour lamp, Neon lamp

Electric Power

Description : Electric Power

Last Answer : Electric Power

State elements of diesel electric power plant with their functions.

Description : State elements of diesel electric power plant with their functions. 

Last 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.

What is the unit of electric power?

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

Last Answer : Correct Answer: A) WATT

Electric power formula

Description : Electric power formula

Last Answer : Electric power formula

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

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

Last 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" 

Explain starting system in diesel electric power plant.

Description : Explain starting system in diesel electric power plant.

Last 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.

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

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

Last 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.

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

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

Last Answer : Advantages of Diesel electric power plant:- 1) The design and layout of Diesel electric power plant is simple. 2) It requires less space. 3) Time required for complete erection of diesel power plant is less ... . 9) The useful life is very short. 10) Availability of fuel in future may be limited.

List out the four applications of diesel electric power plant.

Description : List out the four applications of diesel electric power plant.

Last 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.

An _____________is a network of electrical components used to supply, transfer and use electric power:

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

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

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 

Power factor of electric bulb is?

Description : Power factor of electric bulb is?

Last Answer : Power factor of electric bulb is unity.

Power for lighting in passanger coach, in a long distance electric train, is provided?

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

In a steam locomotive electric power is provided through?

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

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.

What is electric power generation transmission and distribution?

Description : What is electric power generation transmission and distribution?

Last 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.

what are the three different types of Electric power?

Description : what are the three different types of Electric power?

Last Answer : Real,reactive,apparent power

A common method of cooling a power transformer is?

Last Answer : A common method of cooling a power transformer is oil cooling.

74)Power transformers are generally designed to have maximum efficiency around A. No load B. Half load C. Near full load D. 10% overload

Description : 74)Power transformers are generally designed to have maximum efficiency around A. No load B. Half load C. Near full load D. 10% overload

Last Answer : C. Near full load

[23] Transformers are rated in KVA instead of KW because A. load power factor is often not known B. KVA is fixed whereas KW depends on load power factor C. Total transformer loss depends on volt ampere D. It has become customary

Description : [23] Transformers are rated in KVA instead of KW because A. load power factor is often not known B. KVA is fixed whereas KW depends on load power factor C. Total transformer loss depends on volt ampere D. It has become customary

Last Answer : C. Total transformer loss depends on volt ampere

3 phase motor 42 hp same ratting two motors but pole change 2 and 4 pole tell me difference amp of both motors

Description : 3 phase motor  42 hp  same ratting two motors  but pole change 2 and 4 pole   tell me difference amp of both motors

Harmonics in transformer result in?

Last Answer : Harmonics in transformer result in increased core losses, increased I2R losses, and magnetic interference with communication circuits.