In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

asked Mar 19, 2018 by anonymous

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

104 views

Please log in or register to answer this question.

1 Answer

answered Mar 19, 2018 by anonymous

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

← Prev Question Next Question →

Related questions

asked Mar 19, 2018 by anonymous

For a transformer, operating at constant load current, maximum efficiency will occur at?

For a transformer, operating at constant load current, maximum efficiency will occur at?

Last answer: For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

0 like 0 dislike

89 views 1 answer

asked Mar 19, 2018 by anonymous

In an actual transformer the iron loss remains practically constant from no load to full load because?

Last answer: In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

0 like 0 dislike

79 views 1 answer

asked Mar 20, 2018 by anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism...

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

Last answer: The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

0 like 0 dislike

216 views 1 answer

asked Mar 19, 2018 by anonymous

Reduction in core losses and increase in permeability are obtained with transformer employing?

Reduction in core losses and increase in permeability are obtained with transformer employing?

Last answer: Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

0 like 0 dislike

592 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer has negative voltage regulation when its load power factor is

A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging

Last answer: Leading

0 like 0 dislike

1.1k views 2 answers

asked Mar 18, 2018 by anonymous

In a synchronous motor which losses varies with load?

In a synchronous motor which losses varies with load?

Last answer: In a synchronous motor, copper losses varies with load.

0 like 0 dislike

62 views 1 answer

asked Mar 3, 2018 by anonymous

In synchronous motor, does the winding losses vary with load?

In synchronous motor, does the winding losses vary with load?

Last answer: No, in the synchronous motor the winding losses do not vary with load.

0 like 0 dislike

492 views 1 answer

asked Mar 10, 2018 by anonymous

Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

0 like 0 dislike

69 views 0 answers

asked Apr 29, 2018 by anonymous

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

Last answer: A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is 150/√3

0 like 0 dislike

177 views 1 answer

asked Mar 19, 2018 by anonymous

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Last answer: In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

0 like 0 dislike

92 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer will have maximum efficiency at a load such that?

Last answer: An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

0 like 0 dislike

96 views 1 answer

asked Mar 19, 2018 by anonymous

The maximum load that a power transformer can carry is limited by its?

The maximum load that a power transformer can carry is limited by its?

Last answer: The maximum load that a power transformer can carry is limited by its voltage ratio.

0 like 0 dislike

104 views 1 answer

asked Apr 30, 2018 by anonymous

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would (1) increase progressively (2) decrease progressively (3) decrease to a minimum value at α = 0.5 and then increase (4) increase to a maximum value at α = 0.5 and then decrease

Last answer: A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

0 like 0 dislike

191 views 1 answer

asked Mar 19, 2018 by anonymous

The no load current in a transformer lags behind the applied voltage by an angle of about?

Last answer: The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

0 like 0 dislike

79 views 1 answer

asked Mar 19, 2018 by anonymous

Minimum voltage regulation occurs when the power factor of the load is?

Minimum voltage regulation occurs when the power factor of the load is?

Last answer: Minimum voltage regulation occurs when the power factor of the load is leading.

0 like 0 dislike

116 views 1 answer

asked Mar 19, 2018 by anonymous

Negative voltage regulation is indicative that the load is?

Negative voltage regulation is indicative that the load is?

Last answer: Negative voltage regulation is indicative that the load is capacitive.

0 like 0 dislike

109 views 1 answer

asked Mar 19, 2018 by anonymous

A good voltage regulation of a transformer means?

A good voltage regulation of a transformer means?

Last answer: A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.

0 like 0 dislike

58 views 1 answer

asked Mar 19, 2018 by anonymous

The voltage transformation ratio of a transformer is equal to the ratio of?

The voltage transformation ratio of a transformer is equal to the ratio of?

Last answer: The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

0 like 0 dislike

99 views 1 answer

asked Mar 19, 2018 by anonymous

If a transformer is switched on to a voltage more than the rated voltage?

If a transformer is switched on to a voltage more than the rated voltage?

Last answer: If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

0 like 0 dislike

70 views 1 answer

asked Mar 19, 2018 by anonymous

For given applied voltage, with the increase in frequency of the applied voltage?

For given applied voltage, with the increase in frequency of the applied voltage?

Last answer: For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

0 like 0 dislike

177 views 1 answer

asked Mar 19, 2018 by anonymous

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

0 like 0 dislike

108 views 2 answers

asked Apr 30, 2018 by anonymous

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

Last answer: A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V

0 like 0 dislike

137 views 1 answer

asked Mar 21, 2018 by anonymous

In a level compounded D.C. generator, full load terminal voltage is?

Last answer: In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.

0 like 0 dislike

74 views 1 answer

asked Mar 19, 2018 by anonymous

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Last answer: Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

0 like 0 dislike

78 views 1 answer

asked May 8, 2018 by anonymous

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last answer: A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

0 like 0 dislike

427 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is :

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last answer: A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency

0 like 0 dislike

164 views 1 answer

asked Mar 21, 2018 by anonymous

In over compounded generator, full load terminal voltage is?

Last answer: In over compounded generator, full load terminal voltage is more than no load terminal voltage.

0 like 0 dislike

60 views 1 answer

asked Jun 18, 2018 by anonymous

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Last answer: An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

0 like 0 dislike

210 views 1 answer

asked Jun 18, 2018 by anonymous

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

Last answer: A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

0 like 0 dislike

2.6k views 1 answer

asked Apr 29, 2018 by anonymous

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

Last answer: A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular

0 like 0 dislike

509 views 1 answer

asked Mar 20, 2018 by anonymous

Induction cup relay is operated due to changes in?

Last answer: Induction cup relay is operated due to changes in current, voltage, impedance.

0 like 0 dislike

176 views 1 answer

asked Mar 19, 2018 by anonymous

When a given transformer is run at its rated voltage but reduced frequency, its?

Last answer: When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.

0 like 0 dislike

78 views 1 answer

asked Apr 29, 2018 by anonymous

What is a capacitor voltage transformer?

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these

Last answer: What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these

0 like 0 dislike

75 views 1 answer

asked May 8, 2018 by anonymous

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

Last answer: The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA

0 like 1 dislike

132 views 1 answer

asked Mar 10, 2018 by anonymous

What is impulse voltage of transformer?

What is impulse voltage of transformer?

0 like 0 dislike

56 views 0 answers

asked Sep 30, 2017 by anonymous

does the high voltage side of Transformer winding have more number of turns?

Last answer: yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.

0 like 0 dislike

83 views 1 answer

asked May 8, 2018 by anonymous

Step-down transformer converts high voltage and low current into:

Step-down transformer converts high voltage and low current into: (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Last answer: Step-down transformer converts high voltage and low current into: Low voltage and high current

0 like 0 dislike

82 views 1 answer

asked Mar 25, 2018 by anonymous

The time constant of a series R-C circuit is given by?

The time constant of a series R-C circuit is given by?

Last answer: The time constant of a series R-C circuit is given by RC.

0 like 0 dislike

74 views 1 answer

asked Mar 25, 2018 by anonymous

The time constant of the capacitance circuit is defined as the time during which voltage?

The time constant of the capacitance circuit is defined as the time during which voltage?

Last answer: The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.

0 like 0 dislike

88 views 1 answer

asked Mar 25, 2018 by anonymous

Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Last answer: Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.

0 like 0 dislike

61 views 1 answer

asked Mar 20, 2018 by anonymous

Iron losses in a D.C. machine are independent of variations in?

Last answer: Iron losses in a D.C. machine are independent of variations in load.

0 like 0 dislike

112 views 1 answer

asked Mar 10, 2018 by anonymous

What are the losses in a transmission line?

What are the losses in a transmission line?

0 like 0 dislike

50 views 0 answers

asked Jul 27, 2019 by anonymous

State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

Last answer: Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

0 like 0 dislike

102 views 1 answer

asked Mar 19, 2018 by anonymous

The power transformer is a constant?

Last answer: The power transformer is a constant main flux device.

0 like 0 dislike

43 views 1 answer

asked Mar 20, 2018 by anonymous

In case of D.C. machines, mechanical losses are primary function of?

Last answer: In case of D.C. machines, mechanical losses are primary function of speed.

0 like 0 dislike

174 views 1 answer

asked Mar 8, 2018 by anonymous

What are the types of power losses in inductor?

What are the types of power losses in inductor?

Last answer: Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

0 like 0 dislike

93 views 1 answer

asked Mar 19, 2018 by anonymous

No-load current in a transformer?

Last answer: No-load current in a transformer lags behind the voltage by about 75°.

0 like 0 dislike

61 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

0 like 0 dislike

2.5k views 2 answers

asked Mar 26, 2018 by anonymous

In DC motor iron losses are occurred in?

In DC motor iron losses are occurred in?

Last answer: In DC motor iron losses are occurred in the armature.

0 like 0 dislike

110 views 1 answer

asked Sep 27, 2017 by anonymous

what are the losses in DC machine?

Last answer: Iron loss, copper loss and mechanical losses these are the losses in DC machine.

1 like 0 dislike

79 views 1 answer

...