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The maximum load that a power transformer can carry is limited by its?
asked
Mar 19, 2018
by
anonymous
The maximum load that a power transformer can carry is limited by its?
maximum
load
power
transformer
carry
limited
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1
Answer
answered
Mar 19, 2018
by
anonymous
The maximum load that a power transformer can carry is limited by its
voltage ratio.
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Related questions
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
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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
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
transformer
negative
voltage
regulation
load
power
factor
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2
answers
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
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.
step-down
transformer
load
current
change
supply
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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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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.
maximum
constant
load
torque
synchronous
motor
synchronism
rated
rotor
supply
voltage
frequency
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213
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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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102
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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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144
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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
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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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
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1
answer
asked
Sep 30, 2017
by
anonymous
when will be the maximum efficiency of transformer?
Last answer:
Transformer efficiency is maximum when copper losses are equal to iron losses.
transformer
maximum
efficiency
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69
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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.
minimum
voltage
regulation
power
factor
load
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112
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1
answer
asked
Mar 20, 2018
by
anonymous
In a power plant if the maximum demand on the plant is equal to the plant capacity, then?
Last answer:
In a power plant if the maximum demand on the plant is equal to the plant capacity, then plant reserve capacity will be zero.
power
plant
maximum
demand
capacity
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101
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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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42
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1
answer
asked
Mar 20, 2018
by
anonymous
Maximum demand on a power plant is?
Last answer:
Maximum demand on a power plant is the greatest of all "short time interval averaged" demand during a period.
maximum
demand
power
plant
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69
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1
answer
asked
Apr 29, 2018
by
anonymous
Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW
Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh
Last answer:
Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh
power
station
load
factor
capacity
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76
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1
answer
asked
Mar 21, 2018
by
anonymous
The power factor of a single phase load can be calculated if the instruments available are?
Last answer:
The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.
power
factor
single
phase
load
calculated
instruments
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133
views
2
answers
asked
Apr 28, 2018
by
anonymous
The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are
The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity
Last answer:
The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity
power
consumed
balanced
load
measured
two-wattmeter
method
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106
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1
answer
asked
Apr 28, 2018
by
anonymous
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu
Last answer:
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu
maximum
reluctance
power
salient-pole
synchronous
motor
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71
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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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169
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum power in case of D.C. motor is?
condition
maximum
power
dc
motor
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83
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0
answers
asked
Mar 19, 2018
by
anonymous
What is the maximum value of power factor?
What is the maximum value of power factor?
Last answer:
1 is the maximum value of power factor.
maximum
value
power
factor
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79
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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
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1
answer
asked
Jun 18, 2018
by
anonymous
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300o C, then the maximum allowable power dissipation in the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W
Last answer:
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of ... 300o C, then the maximum allowable power dissipation in the device will be 2.00 W
power
mosfet
maximum
junction
temperature
specification
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114
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1
answer
asked
Jun 18, 2018
by
anonymous
If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be
If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be A) Large in amplitude B) Small in amplitude C) Distorted D) Distortion less
Last answer:
If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be Distorted
signal
band
limited
sampled
rate
constructed
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102
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1
answer
asked
Mar 19, 2018
by
anonymous
In a power or distribution transformer about 10 percent end turns are heavily insulated?
Last answer:
In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.
power
distribution
transformer
turns
heavily
insulated
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69
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1
answer
asked
Mar 26, 2018
by
anonymous
The maximum torque of d.c. motors is limited by?
The maximum torque of d.c. motors is limited by?
Last answer:
The maximum torque of d.c. motors is limited by commutation.
maximum
torque
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291
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
kva
transformer
core
loss
full
load
copper
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406
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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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228
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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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68
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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72
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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
Apr 30, 2018
by
anonymous
Generally in a power system network, the load is represented as a :
Generally in a power system network, the load is represented as a : (A) Constant power in both load flow study and in stability study (B) Constant power in load flow study and constant impedance in stability study (C) Constant power in stability study and constant impedance in load flow study (D) Constant impedance in both load flow study and in stability study
Last answer:
Generally in a power system network, the load is represented as a : Constant power in load flow study and constant impedance in stability study
power
system
network
load
represented
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75
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1
answer
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
fully
controlled
converter
feeding
power
dc
load
constant
current
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172
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1
answer
asked
Apr 29, 2018
by
anonymous
Load compensation in power systems is a process to :
Load compensation in power systems is a process to : (A) Maintain better voltage profile (B) Increase short circuit capacity of the system (C) Generate required harmonics for loads like arc furnaces (D) Compensate for the line reactance
Last answer:
Load compensation in power systems is a process to : Maintain better voltage profile
load
compensation
power
systems
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62
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1
answer
asked
Mar 20, 2018
by
anonymous
Load factor of a power station is generally?
Last answer:
Load factor of a power station is generally less than unity.
load
factor
power
station
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52
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1
answer
asked
Mar 20, 2018
by
anonymous
Load factor of a power station is defined as?
Last answer:
Load factor of a power station is defined as average load/maximum demand.
load
factor
power
station
defined
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87
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1
answer
asked
Mar 18, 2018
by
anonymous
If the load of the normally excited synchronous motor is increased the power factor will?
If the load of the normally excited synchronous motor is increased the power factor will?
Last answer:
If the load of the normally excited synchronous motor is increased the power factor will become lagging.
load
normally
excited
synchronous
motor
increased
power
factor
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80
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last answer:
The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
synchronous
motor
leading
power
factor
drive
mechanical
load
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69
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1
answer
asked
Sep 8, 2018
by
anonymous
State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant.
State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant.
Last answer:
1. Because of following points Nuclear power plant used as base load power plant:- 1. Nuclear power plants is very economical for producing bulk amount of electric power 2. Nuclear power plant is reliable ... . The plants can be put on load easily. 4. Diesel engines take less time to make OFF.
nuclear
power
plants
base
load
diesel
peak
plant
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56
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1
answer
asked
Apr 29, 2018
by
anonymous
In a synchronous generator delivering lagging power factor load
In a synchronous generator delivering lagging power factor load (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle
Last answer:
In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle
synchronous
generator
lagging
power
factor
load
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178
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1
answer
asked
Mar 11, 2018
by
anonymous
What is base load and peak load power plants?
What is base load and peak load power plants?
base
load
peak
power
plants
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55
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0
answers
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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107
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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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1
answer
asked
Apr 30, 2018
by
anonymous
In tuned power lines, on load :
In tuned power lines, on load : (A) the receiving end voltage is numerically equal to the sending end voltage (B) the receiving end current is numerically equal to the sending end current (C) there is no voltage drop (D) all the above
Last answer:
In tuned power lines, on load : (A) the receiving end voltage is numerically equal to the sending end voltage (B) the receiving end current is numerically equal to the sending end current (C) there is no voltage drop (D) all the above
tuned
power
lines
load
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55
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1
answer
asked
Mar 19, 2018
by
anonymous
Iron loss of a transformer can be measured by?
Last answer:
Iron loss of a transformer can be measured by low power factor wattmeter.
iron
loss
transformer
measured
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1
answer
asked
May 8, 2018
by
anonymous
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be excessive (B) Current will be too much high (C) Transformer may start to smoke and burn (D) No effect
Last answer:
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect
power
transformer
designed
operation
frequency
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