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A transformer has negative voltage regulation when its load power factor is
Speak Question
asked
Apr 30, 2018
by
anonymous
A transformer has negative voltage regulation when its load power factor is
(1) Zero (2) Unity (3) Leading (4) Lagging
transformer
negative
voltage
regulation
load
power
factor
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Answers
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answered
Apr 30, 2018
by
anonymous
A transformer has negative voltage regulation when its load power factor is
Leading
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Leading
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Related questions
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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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.
negative
voltage
regulation
indicative
load
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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.
good
voltage
regulation
transformer
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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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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
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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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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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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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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2
answers
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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104
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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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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
Apr 30, 2018
by
anonymous
Identify the increasing order of voltage regulation of the following dc generators a same load :
Identify the increasing order of voltage regulation of the following dc generators a same load : (A) differential compound, shunt and under compound (B) shunt, differential compound and under compound (C) under compound, shunt and differential compound (D) shunt, under compound and differential compound
Last answer:
Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound
voltage
regulation
dc
generators
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1
answer
asked
Mar 18, 2018
by
anonymous
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last answer:
In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.
alternator
lagging
generated
voltage
phase
compared
unity
power
factor
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211
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1
answer
asked
May 1, 2018
by
anonymous
An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of
An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is (1) 141 (2) 92.3 (3) 9.23 (4) 1.41
Last answer:
An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23
amplifier
voltage
gain
reduce
distortion
negative
feedback
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1
answer
asked
Sep 5, 2018
by
anonymous
Define load and line regulation.
Define load and line regulation.
Last answer:
1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.
define
load
line
regulation
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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
ssb
transmitter
peak-to-peak
voltage
antenna
load
peak
envelope
power
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210
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1
answer
asked
Mar 19, 2018
by
anonymous
A ferro resonant transformer regulation is also known as?
A ferro resonant transformer regulation is also known as?
Last answer:
A ferro resonant transformer regulation is also known as constant current transformer.
ferro
resonant
transformer
regulation
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71
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1
answer
asked
Mar 19, 2018
by
anonymous
A transformer can have regulation closer to zero?
Last answer:
A transformer can have regulation closer to zero on leading power factor.
transformer
regulation
closer
zero
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88
views
1
answer
asked
May 22, 2020
by
anonymous
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
Last answer:
i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor)
power
factor
short
transmission
lines
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76
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1
answer
asked
Mar 20, 2018
by
anonymous
The voltage regulation in magnetic amplifier type voltage regulator is effected by?
Last answer:
The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.
voltage
regulation
magnetic
amplifier
type
regulator
effected
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83
views
1
answer
asked
Apr 30, 2018
by
anonymous
Load factor is the
Load factor is the (1) Ratio of maximum load on the station to sum of consumer's maximum load. (2) Ratio of average demand to maximum demand. (3) Factor used for increasing load. (4) Reciprocal of (1).
Last answer:
Load factor is the Ratio of average demand to maximum demand.
load
factor
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61
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1
answer
asked
Apr 30, 2018
by
anonymous
The load duration curve for unity load factor will be of
The load duration curve for unity load factor will be of (1) Rectangular shape (2) Triangular shape (3) L -shape (4) I -shape
Last answer:
The load duration curve for unity load factor will be of Rectangular shape
load
duration
curve
unity
factor
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1
answer
asked
Sep 7, 2018
by
anonymous
Classify hydro-electric power plants according to water flow regulation and explain in brief.
Classify hydro-electric power plants according to water flow regulation and explain in brief.
Last answer:
Classification of hydro-electric power plants according to water flow regulation of water flow:- 1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.
hydro-electric
power
plants
according
water
flow
regulation
brief
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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
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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1
answer
asked
Apr 28, 2018
by
anonymous
The benefit of power factor correction in a power system is
The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile
Last answer:
The benefit of power factor correction in a power system is lower power consumption
benefit
power
factor
correction
system
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71
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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
zener
voltage
regulator
load
diode
minimum
current
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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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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
Apr 29, 2018
by
anonymous
In order to have a lower cost of electrical energy generation the load factor
In order to have a lower cost of electrical energy generation the load factor (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high
Last answer:
In order to have a lower cost of electrical energy generation the load factor and the diversity factor both should be high
lower
cost
electrical
energy
generation
load
factor
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83
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1
answer
asked
Mar 20, 2018
by
anonymous
The load factor of domestic load is usually?
Last answer:
The load factor of domestic load is usually 10 to 15%.
load
factor
domestic
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120
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1
answer
asked
Apr 29, 2018
by
anonymous
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
Last answer:
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
power
factor
single
phase
watt
meter
operating
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136
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1
answer
asked
Mar 20, 2018
by
anonymous
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
Last answer:
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.
dc
series
motor
the
power
factor
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92
views
1
answer
asked
Mar 20, 2018
by
anonymous
Which plant can never have 100 percent load factor ?
Last answer:
Peak load plant can never have 100 percent load factor.
plant
load
factor
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45
views
1
answer
asked
Mar 20, 2018
by
anonymous
In two part tariff, variation in load factor will affect?
Last answer:
In two part tariff, variation in load factor will affect operating or running charges.
two
part
tariff
variation
load
factor
affect
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55
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1
answer
asked
Mar 20, 2018
by
anonymous
High load factor indicates?
Last answer:
High load factor indicates total plant capacity is utilised for most of the time.
high
load
factor
indicates
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72
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1
answer
asked
Mar 21, 2018
by
anonymous
A power factor meter has?
Last answer:
A power factor meter has one current circuit and two pressure circuits.
power
factor
meter
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1
answer
asked
Mar 20, 2018
by
anonymous
A synchronous motor has better power factor as compared to that of an equivalent induction motor...
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Last answer:
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.
synchronous
power
factor
equivalent
induction
motor
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86
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1
answer
asked
Mar 20, 2018
by
anonymous
The standard full-load power factor ratings for synchronous motors are?
Last answer:
The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.
standard
full-load
power
factor
ratings
synchronous
motors
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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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1
answer
asked
Mar 6, 2018
by
anonymous
Can we make power factor of synchronous motor leading by adjusting its excitation?
Last answer:
Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.
power
factor
synchronous
motor
leading
adjusting
excitation
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83
views
1
answer
asked
Mar 20, 2018
by
anonymous
An induction motor has relatively high power factor at?
Last answer:
An induction motor has relatively high power factor at near full load.
induction
motor
high
power
factor
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64
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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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92
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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.
ideal
transformer
maximum
efficiency
load
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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 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.
level
compounded
dc
generator
full
load
terminal
voltage
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74
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1
answer
asked
May 3, 2018
by
anonymous
A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage
A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he
Last answer:
A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52
single
phase
transformer
resistance
reactance
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231
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1
answer
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
3-phase
voltage
source
inverter
operates
conduction
mode
star
resistive
load
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1
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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
single-phase
voltage
source
square-wave
inverter
feeds
pure
inductive
load
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509
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1
answer
...