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An ideal transformer is one which has?
asked
Mar 19, 2018
by
anonymous
transformer
ideal
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answered
Mar 19, 2018
by
anonymous
An ideal transformer is one which has
no losses and magnetic leakage.
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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.
ideal
transformer
maximum
efficiency
load
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96
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Mar 19, 2018
by
anonymous
An ideal transformer has infinite values of primary and secondary inductances. The statement is?
Last answer:
An ideal transformer has infinite values of primary and secondary inductances. The statement is false.
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135
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asked
Mar 25, 2018
by
anonymous
An ideal voltage source has?
An ideal voltage source has?
Last answer:
An ideal voltage source has zero internal resistance.
ideal
source
voltage
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56
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1
answer
asked
Apr 28, 2018
by
anonymous
The internal resistances of an ideal current source, and an ideal voltage source are, respectively,
The internal resistances of an ideal current source, and an ideal voltage source are, respectively, (A) 0, ∞ (B) ∞, ∞ (C) ∞, 0 (D) 0,0
Last answer:
The internal resistances of an ideal current source, and an ideal voltage source are, respectively, ∞, 0
internal
resistances
ideal
current
source
voltage
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90
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1
answer
asked
Apr 26, 2018
by
anonymous
The gain of an ideal amplifier must be
The gain of an ideal amplifier must be
Last answer:
The gain of an ideal amplifier must be infinity
gain
ideal
amplifier
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69
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1
answer
asked
Mar 25, 2018
by
anonymous
An ideal voltage source should have?
An ideal voltage source should have?
Last answer:
An ideal voltage source should have zero source resistance.
ideal
voltage
source
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49
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1
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asked
Mar 22, 2018
by
anonymous
An ideal traction system should have?
Last answer:
An ideal traction system should have easy speed control, high starting tractive effort, equipment capable of with standing large temporary loads.
ideal
traction
system
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72
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1
answer
asked
Mar 19, 2018
by
anonymous
In the transformer which winding has got more cross-sectional area?
Last answer:
In the transformer low voltage winding has got more cross-sectional area.
transformer
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133
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1
answer
asked
Mar 19, 2018
by
anonymous
Which winding in a transformer has more number of turns ?
Last answer:
High voltage winding in a transformer has more number of turns.
transformer
turns
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114
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1
answer
asked
Mar 19, 2018
by
anonymous
Which winding of the transformer has less cross-sectional area ?
Last answer:
High voltage winding of the transformer has less cross-sectional area.
transformer
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57
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1
answer
asked
Mar 20, 2018
by
anonymous
For any type of consumer the ideal tariff is?
Last answer:
For any type of consumer the ideal tariff is three part tariff.
type
consumer
ideal
tariff
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96
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1
answer
asked
Aug 14, 2017
by
anonymous
what is ideal voltage source ?
what is ideal voltage source?
Last answer:
every voltage source have their own resistance that is called as internal resistance it is because of the resistance of electrodes and electrolytes in the battery interms of other supplyit have ... in universe it means ideal voltage source is this voltage source having internal resistance zero
ideal
voltage
source
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69
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1
answer
asked
Apr 29, 2018
by
anonymous
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will
Last answer:
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will not change
network
linear
resistors
ideal
voltage
sources
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169
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1
answer
asked
Mar 8, 2018
by
anonymous
What should be the ideal resistance of ammeter ?
What should be the ideal resistance of ammeter ?
Last answer:
Ideal resistance of ammeter should be zero.
ideal
resistance
ammeter
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65
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1
answer
asked
Feb 5, 2018
by
anonymous
What are the desirable characteristics of ideal switch?
What are the desirable characteristics of ideal switch?
Last answer:
Desirable characteristics of the ideal switch: It is desirable to have power switches characteristics closer to ideal switch. The ideal switch should have the following characteristics. Zero resistance when ... . 100% efficiency. Able to control power flow with zero power dissipation.
desirable
characteristics
ideal
switch
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1
answer
asked
Mar 19, 2018
by
anonymous
The magnetising current of a transformer is usually small because it has?
Last answer:
The magnetising current of a transformer is usually small because it has small air gap.
transformer
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60
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1
answer
asked
Mar 19, 2018
by
anonymous
No-load current of a transformer has?
Last answer:
No-load current of a transformer has small magnitude and low power factor.
transformer
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1
answer
asked
Mar 19, 2018
by
anonymous
A shell-type transformer has?
Last answer:
A shell-type transformer has reduced magnetic leakage.
shell-type
transformer
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51
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1
answer
asked
Mar 19, 2018
by
anonymous
The purpose of providing an iron core in a transformer is to?
Last answer:
The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.
transformer
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83
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1
answer
asked
Mar 19, 2018
by
anonymous
An open-circuit test on a transformer is conducted primarily to measure?
An open-circuit test on a transformer is conducted primarily to measure?
Last answer:
The open-circuit test in a transformer is used to measure
open-circuit
test
transformer
conducted
primarily
measure
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277
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2
answers
asked
May 22, 2020
by
anonymous
State why a transformer always have an efficiency of more than 90%.
State why a transformer always have an efficiency of more than 90%.
Last answer:
As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.
transformer
efficiency
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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°.
transformer
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78
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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.
transformer
iron
loss
constant
load
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1
answer
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.
transformer
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101
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1
answer
asked
Mar 19, 2018
by
anonymous
Atmospheric temperature during day and night is taken care of by which part of the transformer?
The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?
Last answer:
The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.
transformer
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45
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1
answer
asked
Mar 19, 2018
by
anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Last answer:
Sandwich type winding is used in 3 phase shell-type transformer.
type
winding
used
phase
shell-type
transformer
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108
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1
answer
asked
Mar 19, 2018
by
anonymous
Part of the transformer which is most subject to damage from overheating is?
Part of the transformer which is most subject to damage from overheating is?
Last answer:
Part of the transformer which is most subject to damage from overheating is winding insulation.
part
transformer
subject
damage
overheating
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74
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1
answer
asked
Mar 19, 2018
by
anonymous
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
Last answer:
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.
transformer
voltage
losses
constant
load
changes
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103
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1
answer
asked
Mar 21, 2018
by
anonymous
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a?
Last answer:
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.
stator
phase
shifting
transformer
use
conjunction
ac
potentiometer
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120
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1
answer
asked
May 15, 2020
by
anonymous
What is the use of transformer?
What is the use of transformer?
Last answer:
The use of transformer is to do lower or raise the voltage or currents in an electrical circuit. That's quite so simple.
use
transformer
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139
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1
answer
asked
Mar 19, 2018
by
anonymous
Efficiency of a power transformer is of the order of?
Last answer:
The efficiency of a power transformer is of the order of 98 percent.
transformer
efficiency
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60
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1
answer
asked
Mar 19, 2018
by
anonymous
The maximum efficiency of a distribution transformer is?
Last answer:
The maximum efficiency of a distribution transformer is at 50% full load.
transformer
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58
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1
answer
asked
Mar 19, 2018
by
anonymous
The purpose of providing iron core in a step-up transformer is?
Last answer:
The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.
transformer
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285
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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.
transformer
power
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43
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1
answer
asked
Mar 19, 2018
by
anonymous
Material used for construction of transformer core is usually?
Last answer:
Material used for construction of transformer core is usually silicon steel.
transformer
core
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115
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1
answer
asked
Mar 19, 2018
by
anonymous
The thickness of laminations used in a transformer is usually?
Last answer:
The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.
transformer
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67
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1
answer
asked
Mar 19, 2018
by
anonymous
The function of conservator in a transformer is?
Last answer:
conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.
transformer
conservator
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104
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3
answers
asked
Mar 19, 2018
by
anonymous
Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
Last answer:
Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.
transformer
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104
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1
answer
asked
Mar 19, 2018
by
anonymous
Noise level test in a transformer is a?
Last answer:
Noise level test in a transformer is a type test.
transformer
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70
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1
answer
asked
Mar 19, 2018
by
anonymous
The core used in high frequency transformer is usually?
Last answer:
The core used in high frequency transformer is usually air core .
transformer
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49
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1
answer
asked
Mar 19, 2018
by
anonymous
The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?
Last answer:
The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.
transformer
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67
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1
answer
asked
Mar 19, 2018
by
anonymous
The value of flux involved in the e.m.f. equation of a transformer is ?
Last answer:
The value of flux involved in the e.m.f. equation of a transformer is maximum value.
transformer
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129
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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.
transformer
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77
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1
answer
asked
Mar 19, 2018
by
anonymous
If the supply frequency to the transformer is increased, the iron loss will?
Last answer:
If the supply frequency to the transformer is increased, the iron loss will increase.
supply
frequency
transformer
increased
iron
loss
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102
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1
answer
asked
Mar 19, 2018
by
anonymous
When secondary of a current transformer is open-circuited its iron core will be?
When secondary of a current transformer is open-circuited its iron core will be?
Last answer:
When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.
secondary
current
transformer
open-circuited
iron
core
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101
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1
answer
asked
Mar 19, 2018
by
anonymous
The function of breather in a transformer is?
Last answer:
The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.
function
breather
transformer
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108
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1
answer
asked
Mar 19, 2018
by
anonymous
The secondary of a current transformer is always short-circuited under operating conditions because it?
The secondary of a current transformer is always short-circuited under operating conditions because it?
Last answer:
The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.
secondary
current
transformer
short-circuited
operating
conditions
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74
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1
answer
asked
Mar 19, 2018
by
anonymous
The noise produced by a transformer is termed as?
The noise produced by a transformer is termed as?
Last answer:
The noise produced by a transformer is termed as hum.
noise
produced
transformer
termed
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77
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1
answer
asked
Mar 19, 2018
by
anonymous
If a transformer is continuously operated the maximum temperature rise will occur in?
If a transformer is continuously operated the maximum temperature rise will occur in?
Last answer:
If a transformer is continuously operated the maximum temperature rise will occur in windings.
transformer
continuously
operated
maximum
temperature
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56
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1
answer
asked
Mar 19, 2018
by
anonymous
The hum in a transformer is mainly attributed to?
The hum in a transformer is mainly attributed to?
Last answer:
The hum in a transformer is mainly attributed to magnetostriction.
hum
transformer
mainly
attributed
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