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when will be the maximum efficiency of transformer?
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asked
Sep 30, 2017
by
anonymous
transformer
maximum
efficiency
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1
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answered
Sep 30, 2017
by
anonymous
Transformer efficiency is maximum when copper losses are equal to iron losses.
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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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1
answer
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.
transformer
operating
constant
load
current
maximum
efficiency
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89
views
1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum efficiency for a D.C. generator is?
Last answer:
The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.
condition
maximum
efficiency
dc
generator
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150
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. generators are normally designed for maximum efficiency around?
Last answer:
D.C. generators are normally designed for maximum efficiency around full-load.
dc
generators
normally
designed
maximum
efficiency
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69
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1
answer
asked
Mar 20, 2018
by
anonymous
Generators for peak load plants are usually designed for maximum efficiency at?
Last answer:
Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.
generators
peak
load
plants
designed
maximum
efficiency
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86
views
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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1
answer
asked
Oct 5, 2017
by
anonymous
is efficiency of transformer is greater than electrical machine and why?
Last answer:
The efficiency of transformer is Greater than electrical Machine because there is no rotational losses in transformer and there is no air gap losses in transformer so losses is less in transformer compare to electrical machine so efficiency is higher in case of transformer.
transformer
efficiency
electrical
machines
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3
answers
asked
Jun 11, 2019
by
anonymous
Transformer efficiency
Transformer efficiency
Last answer:
Transformer efficiency
transformer
efficiency
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63
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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
transformer
operates
full
load
efficiency
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162
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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 efficiency of a transformer, under heavy loads, is comparatively low because?
The efficiency of a transformer, under heavy loads, is comparatively low because?
Last answer:
The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.
efficiency
transformer
heavy
loads
comparatively
low
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65
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1
answer
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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31
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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.
maximum
load
power
transformer
carry
limited
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104
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1
answer
asked
Mar 20, 2018
by
anonymous
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?
Last answer:
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.
mechanical
power
shunt
motor
maximum
ratio
back
emf
voltage
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145
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
The synchronous motor will develop maximum power when the load angle is?
Last answer:
The synchronous motor will develop maximum power when the load angle is 900.
synchronous
motor
develop
maximum
power
load
angle
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80
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?
Last answer:
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
dc
shunt
motor
conditions
maximum
power
current
armature
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174
views
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 20, 2018
by
anonymous
The efficiency of a properly designed synchronous motor will usually fall in range?
Last answer:
The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
efficiency
designed
synchronous
motor
usually
range
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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 25, 2018
by
anonymous
For high efficiency of transfer of power, internal resistance of the source should be?
For high efficiency of transfer of power, internal resistance of the source should be?
Last answer:
For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.
high
efficiency
transfer
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250
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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.
efficiency
identical
transformers
load
conditions
determined
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1
answer
asked
Mar 20, 2018
by
anonymous
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?
maximum
torque
synchronous
motor
rated
stator
supply
voltage
frequency
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86
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0
answers
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.
maximum
constant
load
torque
synchronous
motor
synchronism
rated
rotor
supply
voltage
frequency
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216
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1
answer
asked
Mar 20, 2018
by
anonymous
Power plant having maximum demand more than the installed rated capacity will have utilisation factor?
Last answer:
Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.
power
plant
maximum
demand
installed
rated
capacity
utilisation
factor
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69
views
1
answer
asked
Mar 25, 2018
by
anonymous
"Maximum power output is obtained from a network when the load resistance...
"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with?
Last answer:
"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with Maximum power transfer theorem.
maximum
power
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116
views
1
answer
asked
Mar 20, 2018
by
anonymous
In repulsion motor, maximum torque is developed when?
Last answer:
In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.
repulsion
motor
maximum
torque
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70
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1
answer
asked
Mar 25, 2018
by
anonymous
For maximum transfer of power, internal resistance of the source should be?
For maximum transfer of power, internal resistance of the source should be?
Last answer:
For maximum transfer of power, internal resistance of the source should be equal to load resistance.
maximum
transfer
power
internal
resistance
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232
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
kva
rating
three-phase
transformer
voltage
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132
views
1
answer
asked
Aug 2, 2019
by
anonymous
"Efficiency of thermal power station is low". — Justify.
"Efficiency of thermal power station is low". — Justify.
Last answer:
Justification: Efficiency of thermal power station is low":- Overall efficiency of T.P.P depends upon efficiency of boiler, turbine and alternator. The heat produced due to combustion of coal ... losses in thermal power plant is 71%, So efficiency of thermal power plant is less about 29%
efficiency
thermal
power
station
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60
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1
answer
asked
Aug 25, 2019
by
anonymous
method for improving string efficiency
method for improving string efficiency
Last answer:
The Methods of Improving String Efficiency:- 1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.
improving
string
efficiency
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41
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1
answer
asked
Sep 1, 2018
by
anonymous
What will be the efficiency when the transformer operates at unity power factor and 60% of full load
What will be the efficiency when the transformer operates at unity power factor and 60% of full load
Last answer:
What will be the efficiency when the transformer operates at unity power factor and 60% of full load 96.5%
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142
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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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68
views
1
answer
asked
May 3, 2020
by
anonymous
Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span
Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span
Last answer:
Parameter LED CFL Lamp Efficiency High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000
compare
the
salient
features
of
led
and
cfl
based
on
i
lamp
efficiency
ii
life
span
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39
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1
answer
asked
Jun 18, 2018
by
anonymous
What is the efficiency of Class-B amplifier?
What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
Last answer:
What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
efficiency
class-b
amplifier
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63
views
1
answer
asked
May 8, 2018
by
anonymous
The overall efficiency of Thermal Power Plant is equal to _______________ .
The overall efficiency of Thermal Power Plant is equal to _______________ . (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above
Last answer:
The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency.
overall
efficiency
thermal
power
plant
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118
views
1
answer
asked
Apr 29, 2018
by
anonymous
The rankine cycle efficiency of steam power plant is
The rankine cycle efficiency of steam power plant is (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%
Last answer:
The rankine cycle efficiency of steam power plant is 30-45%
rankine
cycle
efficiency
steam
power
plant
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64
views
1
answer
asked
Apr 26, 2018
by
anonymous
Transmission efficiency of a transmission line increases with the
Transmission efficiency of a transmission line increases with the
Last answer:
Transmission efficiency of a transmission line increases with the increase in power factor and voltage
transmission
efficiency
line
increases
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67
views
1
answer
asked
Mar 22, 2018
by
anonymous
The efficiency of diesel locomotives is nearly?
Last answer:
The efficiency of diesel locomotives is nearly 20 to 25 percent.
efficiency
diesel
locomotives
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55
views
1
answer
asked
Mar 22, 2018
by
anonymous
The overall efficiency of steam locomotive is around?
Last answer:
The overall efficiency of steam locomotive is around 5 to 10 percent.
overall
efficiency
steam
locomotive
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68
views
1
answer
asked
Mar 20, 2018
by
anonymous
The range of efficiency for shaded pole motors is?
Last answer:
The range of efficiency for shaded pole motors is 5% to 35%.
range
efficiency
shaded
pole
motors
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79
views
1
answer
asked
Aug 17, 2019
by
anonymous
Define : i) Maximum Value ii) RMS Value of ac supply
Define : i) Maximum Value ii) RMS Value of ac supply
Last answer:
i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value. ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time.
maximum
value
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44
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1
answer
asked
May 2, 2020
by
anonymous
Define PIV, TUF, ripple factor, efficiency of rectifier.
Define PIV, TUF, ripple factor, efficiency of rectifier.
Last answer:
Peak Inverse Voltage (PIV): The maximum value of reverse voltage (for the diode in a rectifier) occurring at the peak of the negative cycle of the input cycle is called Peak Inverse Voltage. ... dc power delivered to the load to the ac input power from the secondary winding of the transformer.
define
piv
tuf
ripple
factor
efficiency
of
rectifier
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150
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1
answer
asked
Aug 4, 2019
by
anonymous
Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.
Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.
Last answer:
1) Virtual height:- The incident and refracted rays follow paths that are exactly the same as they have been if reflection had taken place from a surface located at a greater height, called ... angle of incidence is other than the normal is known as maximum unstable frequency. MUF= fc secθ
virtual
height
actual
critical
frequency
maximum
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56
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1
answer
asked
Mar 6, 2018
by
anonymous
String efficiency is used for measuring the?
Last answer:
String efficiency is used for measuring the degree of utilization of SCR.
string
efficiency
used
measuring
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109
views
1
answer
asked
May 22, 2019
by
anonymous
Maximum Power Transfer Theorem 1
Maximum Power Transfer Theorem 1
Last answer:
Maximum Power Transfer Theorem 1
maximum
power
transfer
theorem
1
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73
views
1
answer
asked
Sep 6, 2018
by
anonymous
State maximum power transfer theorem for DC circuit.
State maximum power transfer theorem for DC circuit.
Last answer:
Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.
maximum
power
transfer
theorem
dc
circuit
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72
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1
answer
asked
Jun 18, 2018
by
anonymous
An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to
An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS
Last answer:
An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS
independent
voltage
source
series
impedance
delivers
maximum
average
power
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2.6k
views
1
answer
asked
Jan 2
by
anonymous
SEER: Seasonal Energy Efficiency Ratio (SEER)
SEER: Seasonal Energy Efficiency Ratio (SEER)
Last answer:
SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.
seer
seasonal
energy
efficiency
ratio
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4
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1
answer
asked
Mar 18, 2018
by
anonymous
Which motor have more efficiency, synchronous motor or induction motor?
Which motor have more efficiency, synchronous motor or induction motor?
Last answer:
Synchronous motor has more efficiency.
efficiency
synchronous
induction
motor
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61
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a transformer routine efficiency depends upon?
Last answer:
In a transformer, routine efficiency depends upon load current and power factor of load.
transformer
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90
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1
answer
...