x

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?
Share
180 views
by
edited

2 Answers

Answer :

The efficiencies of transformers compared with that of electric motors of the same power are somewhat smaller.
Like 0 like
by
edited

Answer :

Transformers have high efficiency than the same ratted motors
Like 0 like
by

Please log in or register to answer this question.

Related Questions

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

Losses which occur in rotating electric machines and do not occur in transformers are?
Last Answer : Friction losses windage losses 

Show More
211 views 2 answers
asked Mar 19, 2018 by anonymous
Suggest electric motors for i) traction ii) crane iii) lathe machine iv) domestic fan.

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

Show More
77 views 1 answer
asked Aug 17, 2019 by anonymous
State which electric motors are generally used in electro agro systems with reason.

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.

Show More
95 views 1 answer
asked Aug 17, 2019 by anonymous
Classify the transformers based on the construction, frequency and power.

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. 

Show More
133 views 1 answer
asked Aug 30, 2018 by anonymous
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.

Show More
99 views 1 answer
asked Mar 20, 2018 by anonymous
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.

Show More
110 views 1 answer
asked Mar 20, 2018 by anonymous
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.

Show More
108 views 1 answer
asked Mar 19, 2018 by anonymous
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.

Show More
159 views 1 answer
asked Mar 19, 2018 by anonymous
What will happen if the transformers working in parallel are not connected with regard to polarity ?


Last Answer : Winding will be damaged

Show More
138 views 2 answers
asked Mar 19, 2018 by anonymous
If the percentage impedances of the two transformers working in parallel are different, then?

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.

Show More
135 views 1 answer
asked Mar 19, 2018 by anonymous
Distribution transformers are generally designed for maximum efficiency around?


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

Show More
144 views 1 answer
asked Mar 19, 2018 by anonymous
Two transformers do not have equal percentage impedance. This is likely to result in?

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.

Show More
381 views 1 answer
asked Mar 19, 2018 by anonymous
Short circuit test on transformers is conducted to determine?


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

Show More
221 views 1 answer
asked Mar 19, 2018 by anonymous
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.

Show More
201 views 2 answers
asked Mar 19, 2018 by anonymous
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 .

Show More
191 views 1 answer
asked Mar 19, 2018 by anonymous
The efficiency of two identical transformers under load conditions can be determined by?

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.

Show More
325 views 1 answer
asked Mar 19, 2018 by anonymous
Electric Power

Electric Power
Last Answer : Electric Power

Show More
95 views 1 answer
asked Apr 8, 2020 by anonymous
State elements of diesel electric power plant with their functions.

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.

Show More
100 views 1 answer
asked Aug 2, 2019 by anonymous
What is the unit of electric power?

Options: A) WATT B) AMPERE C) VOLTS D) OHM
Last Answer : Correct Answer: A) WATT

Show More
76 views 1 answer
asked Jun 28, 2019 by anonymous
Electric power formula

Electric power formula
Last Answer : Electric power formula

Show More
65 views 1 answer
asked Jun 11, 2019 by anonymous
"Hydro electric power station are not perennial power station". Justify.

"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" 

Show More
92 views 1 answer
asked Sep 8, 2018 by anonymous
Explain starting system in diesel electric power plant.

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.

Show More
130 views 1 answer
asked Sep 8, 2018 by anonymous
Explain fuel system and air intake system in diesel electric power plant.

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.

Show More
125 views 1 answer
asked Sep 8, 2018 by anonymous
State any four advantages and four disadvantages of diesel electric power plant.

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.

Show More
125 views 1 answer
asked Sep 7, 2018 by anonymous
List out the four applications of diesel electric power plant.

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.

Show More
169 views 1 answer
asked Sep 7, 2018 by anonymous
An _____________is a network of electrical components used to supply, transfer and use electric power:

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.

Show More
94 views 1 answer
asked May 8, 2018 by anonymous
The storage battery generally used in electric power stations is

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 

Show More
107 views 1 answer
asked Apr 29, 2018 by anonymous
Power factor of electric bulb is?

Power factor of electric bulb is?
Last Answer : Power factor of electric bulb is unity.

Show More
93 views 1 answer
asked Mar 25, 2018 by anonymous
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.

Show More
103 views 1 answer
asked Mar 22, 2018 by anonymous
In a steam locomotive electric power is provided through?


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

Show More
78 views 1 answer
asked Mar 22, 2018 by anonymous
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.

Show More
97 views 1 answer
asked Mar 20, 2018 by anonymous
Direct conversion of heat into electric power is possible through?


Last Answer : By  use  of  thermocouple.

Show More
215 views 2 answers
asked Mar 20, 2018 by anonymous
What is electric power generation transmission and distribution?

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.

Show More
216 views 1 answer
asked Dec 16, 2017 by anonymous
what are the three different types of Electric power?

what are the three different types of Electric power?
Last Answer : Real,reactive,apparent power

Show More
126 views 2 answers
asked Dec 4, 2017 by anonymous
Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) :

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

Show More
95 views 1 answer
asked Apr 30, 2018 by anonymous
A common method of cooling a power transformer is?


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

Show More
157 views 1 answer
asked Mar 19, 2018 by anonymous
74)Power transformers are generally designed to have maximum efficiency around A. No load B. Half load C. Near full load D. 10% overload

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

Show More
14 views 1 answer
asked Jul 21, 2021 by jyoti kurekar
[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

[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

Show More
132 views 1 answer
asked Jul 21, 2021 by jyoti kurekar
3 phase motor 42 hp same ratting two motors but pole change 2 and 4 pole tell me difference amp of both motors

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

Show More
2.6k views 0 answers
asked Jul 24, 2019 by ZAHID
Harmonics in transformer result in?


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

Show More
71 views 1 answer
asked Mar 19, 2018 by anonymous
TRANSFORMERS MCQ

TRANSFORMERS MCQ
Last Answer : 101. A shell-type transformer has (a) high eddy current losses (b) reduced magnetic leakage (c) negligibly hysteresis losses (d) none of the above Ans: b 102. A transformer can have regulation closer to zero (a ... (6) much smaller (c) much higher (d) somewhat smaller (e) none of the above Ans: c

Show More
547 views 3 answers
asked Jun 22, 2021 by itszee
What are the schedules of maintenance done on transformers?

What are the schedules of maintenance done on transformers?
Last Answer : Ans. Following are the schedules of maintenance on transformers. a. Daily maintenance. b. Monthly maintenance. c. Quarterly maintenance. d. Half yearly maintenance. e. Yearly maintenance. f. 5 Yearly maintenance.

Show More
7 views 1 answer
asked Jun 20, 2021 by itszee
Why a transformer requires cooling. What are the methods of cooling transformers?

Why a transformer requires cooling. What are the methods of cooling transformers?
Last Answer : Ans. Transformers requires cooling as they get heated up due to various losses taking place in the transformer. (like iron of copper losses) Following are the methods of cooling of transformer. a. Natural ... . Forced oil air Natural Cooling (OFAN). d. Forced oil and forced Air cooling (OFAF).

Show More
7 views 1 answer
asked Jun 20, 2021 by itszee
What are the loses in Transformers, Explain?

What are the loses in Transformers, Explain?
Last Answer : Ans. (1) Iron loses (2) Copper loses Iron Loss : Iron loss occurs in the transformers Iron core due to hysteresis and eddy currents taking place. They are almost fixed irrespective of ... losses in the primary and the secondary windings of the transformer which with the loading of transformer.

Show More
3 views 1 answer
asked Jun 20, 2021 by itszee
Which of the following connection of transformers will give highest value of secondary voltage ?

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary
Last Answer : Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

Show More
587 views 1 answer
asked May 8, 2018 by anonymous
Two transformers A and B having equal outputs and voltage ratios but unequal percentage

Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 
Last Answer : Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 33%

Show More
686 views 1 answer
asked May 8, 2018 by anonymous
Core type transformers are popular in___________.

Core type transformers are popular in___________.  (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above
Last Answer : Core type transformers are popular in High voltage applications

Show More
99 views 1 answer
asked May 8, 2018 by anonymous
In a transmission line if booster transformers are to be used, preferred location will be

In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 
Last Answer : In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point

Show More
348 views 1 answer
asked May 8, 2018 by anonymous
The friction losses in Real Transformers are :

The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%
Last Answer : A

Show More
3.3k views 2 answers
asked May 8, 2018 by anonymous
Show More⇦ PreviousNext ⇨