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During open circuit test of a transformer?
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asked
Mar 19, 2018
by
anonymous
During open circuit test of a transformer?
open
circuit
test
transformer
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1
Answer
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answered
Mar 19, 2018
by
anonymous
During open circuit test of a transformer
primary is supplied rated voltage.
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asked
Sep 27, 2017
by
anonymous
in open circuit or no load test of transformer which side is open circuited?
Last answer:
High Voltage side is open circuited.
transformer
open
circuit
test
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91
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1
answer
asked
Sep 27, 2017
by
anonymous
in open circuit or no load test of transformer which side is low voltage side and which side is high voltage side?
Last answer:
Primary side is low voltage side and secondary side is high voltage side.
open
circuit
test
transformer
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1
answer
asked
Apr 27, 2020
by
anonymous
Explain the open delta (delta-delta) test on transformer.
Explain the open delta (delta-delta) test on transformer.
open
delta
delta-delta
test
transformer
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0
answers
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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281
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2
answers
asked
Sep 27, 2017
by
anonymous
in short circuit test of transformer which side is short circuited?
Last answer:
Low voltage side is short circuited.
transformer
short
circuit
test
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140
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1
answer
asked
Sep 27, 2017
by
anonymous
in short circuit test of transformer which side is low voltage side and which side is high voltage side?
Last answer:
Primary is high voltage side and Secondary is low Voltage side.
transformer
circuit
test
short
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99
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1
answer
asked
Apr 27, 2020
by
anonymous
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
explain
the
procedure
to
perform
short
circuit
test
on
single
phase
transformer
with
diagram
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answers
asked
Sep 3, 2017
by
anonymous
what is short circuit test in transformer?
Last answer:
In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.
short
circuit
test
transformer
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1
answer
asked
Mar 19, 2018
by
anonymous
A no-load test is performed on a transformer to determine?
A no-load test is performed on a transformer to determine?
Last answer:
A no-load test is performed on a transformer to determine magnetizing current and loss.
no-load
test
transformer
determine
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1
answer
asked
Mar 19, 2018
by
anonymous
Sumpner's test is conducted on transformer to determine?
Sumpner's test is conducted on transformer to determine?
Last answer:
Sumpner's test is conducted on transformer to determine temprature.
sumpners
test
conducted
transformer
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92
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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.
short
circuit
test
transformers
conducted
determine
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1
answer
asked
Apr 25, 2018
by
anonymous
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is ...
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W
Last answer:
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W
dc
open
circuit
voltage
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138
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1
answer
asked
Mar 21, 2018
by
anonymous
It is required to measure the true open circuit e.m.f. of a battery. The best device is?
Last answer:
It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.
measure
open
circuit
emf
battery
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110
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1
answer
asked
Jun 29, 2019
by
anonymous
Describe the difference between an open circuit and a short circuit.
Describe the difference between an open circuit and a short circuit.
Last answer:
Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit
describe
the
difference
between
an
open
circuit
and
a
short
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3
answers
asked
Apr 28, 2018
by
anonymous
If a 5-bus test system contains 6 transmission lines and one transformer, how many non- zero elements are
If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19
Last answer:
If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.
test
system
contains
transmission
lines
transformer
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1
answer
asked
Feb 19, 2018
by
anonymous
Explain open emitter BJT drive circuit.
Explain open emitter BJT drive circuit.
Last answer:
open emitter BJT drive circuit:
open
emitter
bjt
drive
circuit
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230
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1
answer
asked
Apr 30, 2020
by
anonymous
Polarity Test of Transformer
Polarity Test of Transformer
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
polarity
test
of
transformer
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278
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2
answers
asked
May 17, 2020
by
anonymous
Equivalent circuit of transformer
Equivalent circuit of transformer
Last answer:
Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance
equivalent
circuit
transformer
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226
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2
answers
asked
Mar 19, 2018
by
anonymous
During short circuit test iron losses are negligible because?
During short circuit test iron losses are negligible because?
Last answer:
During short circuit test iron losses are negligible because the voltage applied on primary side is low.
transformer
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1
answer
asked
Jul 27, 2019
by
anonymous
Why phasing out and polarity test is carried out on three phase transformer?
Why phasing out and polarity test is carried out on three phase transformer?
Last answer:
The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.
phasing
out
polarity
test
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1
answer
asked
Jun 18, 2018
by
anonymous
An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to
An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
Last answer:
An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
ac
supply
half-wave
rectifier
circuit
transformer
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124
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1
answer
asked
Mar 20, 2018
by
anonymous
The short circuit in any winding of the transformer is the result of?
Last answer:
The short circuit in any winding of the transformer is the result of impulse voltage.
short
circuit
winding
transformer
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132
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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
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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71
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1
answer
asked
Apr 27, 2020
by
anonymous
With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.
With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.
Last answer:
i) This test is carried out on 3-ph transformer to identify primary & secondary winding belonging to the same phase. ii) As shown in fig above all primary & secondary phases ... of this test is to check the respective phases of primary & secondary windings in 3-ph transformer
phasing
out
test
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152
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1
answer
asked
May 17, 2018
by
anonymous
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at (A) 50.0% of the rated current (B) 64.0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current
Last answer:
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both ... measured loss is 81 W. The transformer has maximum efficiency when operated at 80.0% of the rated current
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205
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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 20, 2018
by
anonymous
The duration of sudden short-circuit test on a synchronous motor is usually about?
Last answer:
The duration of sudden short-circuit test on a synchronous motor is usually about one second.
short-circuit
test
synchronous
motor
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118
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1
answer
asked
Mar 20, 2018
by
anonymous
Open circuited armature coil of a D.C. machine is?
Last answer:
Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.
open
circuited
armature
coil
dc
machine
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1
answer
asked
Jul 4, 2019
by
anonymous
What are the disadvantages of Open loop control system?
What are the disadvantages of Open loop control system?
Last answer:
Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.
open
loop
system
control
disadvantages
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56
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1
answer
asked
Jun 18, 2018
by
anonymous
What will happen to the gain margin if the gain of the open loop system is doubled?
What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth
Last answer:
What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth
gain
margin
open
loop
system
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146
views
1
answer
asked
Apr 30, 2018
by
anonymous
If the gain of the open loop system is doubled, the gain margin
If the gain of the open loop system is doubled, the gain margin (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth
Last answer:
If the gain of the open loop system is doubled, the gain margin Becomes half
open
loop
system
doubled
gain
margin
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348
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1
answer
asked
Mar 20, 2018
by
anonymous
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?
Last answer:
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.
field
winding
unloaded
salient
pole
synchronous
motor
open
circuited
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116
views
1
answer
asked
Mar 10, 2018
by
anonymous
What is an example of an open loop system?
What is an example of an open loop system?
Last answer:
Open loop system. Ex. Electric heater, washing machine, fan, electric switch, etc
example
open
loop
system
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77
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1
answer
asked
Mar 10, 2018
by
anonymous
What are the advantages of open loop control system?
What are the advantages of open loop control system?
Last answer:
Open loop control system are simple to design. Open loop control system are generally stable.
advantages
open
loop
control
system
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90
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1
answer
asked
Sep 6, 2018
by
anonymous
Why CT is never operated with an open secondary ?
Why CT is never operated with an open secondary ?
Last answer:
CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety
ct
operated
open
secondary
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66
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2
answers
asked
Mar 25, 2018
by
anonymous
An open resistor, when checked with an ohm-meter reads?
An open resistor, when checked with an ohm-meter reads?
Last answer:
An open resistor, when checked with an ohm-meter reads infinite.
open
resistor
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88
views
1
answer
asked
Dec 4, 2017
by
anonymous
what is open loop and close loop control system?
what is open loop and close loop control system?
Last answer:
A) In open loop system the input is independent of output but output is depends on input. A-1. no feedback path in open loop s/m -2. less accuracy than close loop s/m. Ex. Washing ... -3. high accuracy. Ex. Air conditioner ( AC ), rocket launcher, radar system, etc
open
loop
close
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94
views
2
answers
asked
May 25, 2018
by
anonymous
The voltage applied to the H.V. side of a transformer during S.C. test is 2% of the rated voltage. The core loss
The voltage applied to the H.V. side of a transformer during S.C. test is 2% of the rated voltage. The core loss as the fraction of its rated core loss is (a) 4% (b) 0.4% (c) 0.25% (d) 0.04%
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91
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0
answers
asked
Apr 29, 2018
by
anonymous
Slip test is performed to determine : (A) Slip in an induction motor vtkgi Xd and Xq in a salient pole alternator
Slip test is performed to determine : (A) Slip in an induction motor (B) Xd and Xq in a salient pole alternator (C) Synchronous impedance in an alternator (D) Positive and negative sequence impedances of an alternator
Last answer:
Slip test is performed to determine : Xd and Xq in a salient pole alternator
slip
test
determine
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78
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1
answer
asked
Mar 15, 2018
by
anonymous
How do you test a capacitor with a multimeter?
How do you test a capacitor with a multimeter?
test
capacitor
multimeter
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114
views
0
answers
asked
Mar 15, 2018
by
anonymous
How do we test a diode?
How do we test a diode?
test
diode
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0
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57
views
0
answers
asked
Mar 15, 2018
by
anonymous
How do you test a triac?
How do you test a triac?
test
triac
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0
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38
views
0
answers
asked
Mar 10, 2018
by
anonymous
What is a high voltage test?
What is a high voltage test?
high
voltage
test
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50
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0
answers
asked
Mar 21, 2018
by
anonymous
Murray loop test can be used for location of?
Last answer:
Murray loop test can be used for location of both the ground fault and the short-circuit fault.
murray
loop
test
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58
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1
answer
asked
Apr 22, 2020
by
anonymous
DC motor brake test numerical
DC motor brake test numerical
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
dc
motor
brake
test
numerical
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49
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2
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asked
Apr 21, 2020
by
anonymous
Brake test on DC series motor
Brake test on DC series motor
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
brake
test
on
dc
series
motor
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159
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2
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asked
Apr 16, 2020
by
anonymous
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
explain
the
need
and
steps
to
conduct
reduced
voltage
running
up
test
on
three
phase
induction
motor
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answers
asked
Jul 22, 2019
by
anonymous
What is test bench? Write its applications
What is test bench? Write its applications
Last answer:
Test Bench: A test bench is used to verify the functionality of the design. We need to stimulate our designs in order to test their functionality. Stimulus in a real system is from an ... the entity under test and to collect output responses. 6. To compare output responses with expected values.
test
bench
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54
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1
answer
asked
Mar 20, 2018
by
anonymous
Hopkinson's test on D.C. machines is conducted at?
Last answer:
Hopkinson's test on D.C. machines is conducted at full-load.
hopkinsons
test
dc
machines
conducted
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1
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...