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What are the five types of single phase motors used in the industry?
asked
Mar 15, 2018
by
anonymous
What are the five types of single phase motors used in the industry?
five
types
single
phase
motors
used
industry
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asked
Mar 20, 2018
by
anonymous
The capacitors used in single-phase capacitor motors have no?
Last answer:
The capacitors used in single-phase capacitor motors have no polarity marking.
capacitors
used
single-phase
capacitor
motors
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105
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1
answer
asked
Apr 29, 2018
by
anonymous
Stepper motors are used in
Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators
Last answer:
Stepper motors are used in printers
stepper
motors
used
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46
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1
answer
asked
Mar 20, 2018
by
anonymous
Starters are used with D.C. motors because?
Last answer:
Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
starters
used
dc
motors
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1
answer
asked
Mar 20, 2018
by
anonymous
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?
Last answer:
Reason is kinetic energy
single
phase
induction
motor
disconnected
supply
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120
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2
answers
asked
Mar 20, 2018
by
anonymous
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?
Last answer:
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.
starting
winding
single
phase
motor
refrigerator
disconnected
circuit
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151
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1
answer
asked
Oct 24, 2017
by
anonymous
explain the working of single phase induction motor.
explain the working of single phase induction motor.
Last answer:
Stator has two winding namely main winding and auxiliary winding.when single phase ac supply is given to the motor,its produces alternating field.this field cut by a cage rotor.so some emf ... due to this emf,rotor flux produced.the interaction between two fluxes produce torque.so rotor rotates.
motor
induction
phase
working
single
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103
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1
answer
asked
Mar 20, 2018
by
anonymous
If a single phase induction motor runs slower than normal, the most likely defect is?
Last answer:
If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.
single
phase
induction
motor
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108
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1
answer
asked
Mar 17, 2018
by
anonymous
How does a single phase induction motor work?
How does a single phase induction motor work?
Last answer:
As we know that single phase induction is not self started because for self started we require atleast two revolving field but single phase induction motor has only one. So we provide extra ... 1phase IM classified as split phase IM, capacitor start capacitor run, capacitor start induction run.
single
phase
induction
motor
work
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92
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1
answer
asked
Aug 9, 2017
by
anonymous
Single Phase Induction Motor
Single Phase Induction Motor
Last answer:
Single Phase Induction Motor Single phase induction motor is mostly used in home, office, shop and many single phase appliances like pumps, ... torque and silent operation. It is uses where silent operation is required.
single
phase
induction
motor
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450
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1
answer
asked
Sep 2, 2019
by
anonymous
Why is a capacitor used in a single phase motor and not in three phase motor ?
Why is a capacitor used in a single phase motor and not in three phase motor ?
Last answer:
In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
capacitor
single
three
phase
motor
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127
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6
answers
asked
Mar 20, 2018
by
anonymous
D.C. shunt motors are used for driving?
Last answer:
D.C. shunt motors are used for driving machine tools.
dc
shunt
motors
used
driving
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68
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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
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2
answers
asked
May 3, 2020
by
anonymous
State the different types of outdoor flood lighting and where are they used.
State the different types of outdoor flood lighting and where are they used.
Last answer:
There are three types of projectors used for flood lighting : a) Narrow beam Projector b) Medium angle Projector c) Wide angle Projector a) Narrow beam Projectors: - Light beam with such ... yards, stadiums, car parking area etc. 3) It is used for illuminating advertisements, boarding's etc.
state
the
different
types
of
outdoor
flood
lighting
and
where
are
they
used
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68
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1
answer
asked
Mar 20, 2018
by
anonymous
The single phasing relays are used for the protection of?
Last answer:
The single phasing relays are used for the protection of three phase motors.
single
phasing
relays
used
protection
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133
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1
answer
asked
Apr 29, 2018
by
anonymous
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
Last answer:
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
single
phase
induction
motor
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79
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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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135
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1
answer
asked
May 8, 2018
by
anonymous
A relay used for protection of motors against overload is :
A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last answer:
A relay used for protection of motors against overload is : Thermal relay
relay
used
protection
motors
overload
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232
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1
answer
asked
Aug 13, 2019
by
Alacrity
the volt per turn of a certain single phase transformers is 1.7. the transformer has a step ratio of 3825/255volt. calculate the respective number of turns in each winding
single
phase
transformers
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49
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0
answers
asked
Apr 25, 2018
by
anonymous
The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is
The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W
Last answer:
The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is 500 W
single
phase
induction-type
energy
meter
disc
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139
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1
answer
asked
Mar 21, 2018
by
anonymous
In a single phase power factor meter the phase difference between the currents in the two pressure coils is?
Last answer:
In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.
single
phase
power
factor
meter
difference
between
currents
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158
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1
answer
asked
Mar 20, 2018
by
anonymous
In a single phase motor the centrifugal switch?
Last answer:
In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.
single
phase
motor
centrifugal
switch
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122
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1
answer
asked
May 7, 2020
by
anonymous
State different types of holders used in wiring installation.
State different types of holders used in wiring installation.
Last answer:
Following types of holders used in wiring installation: 1. Pendent Holder 2. Batten Holder 3. Angle holder 4. Screwed holder
state
different
types
of
holders
used
in
wiring
installation
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49
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1
answer
asked
Mar 21, 2018
by
anonymous
Induction type single phase energy meters measure electric energy in?
Last answer:
Induction type single phase energy meters measure electric energy in kWh.
induction
type
single
phase
energy
meters
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227
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1
answer
asked
Mar 11, 2018
by
anonymous
Explain power in single phase AC circuit.
Explain power in single phase AC circuit.
power
single
phase
ac
circuit
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68
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0
answers
asked
Jul 30, 2019
by
anonymous
Explain the working of a single phase capacitor start induction motor.
Explain the working of a single phase capacitor start induction motor.
Last answer:
Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
single
phase
capacitor
start
induction
motor
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145
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2
answers
asked
Jul 25, 2019
by
anonymous
Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Last answer:
Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.
single
phase
full
wave
bridge
controlled
converter
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158
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1
answer
asked
Apr 28, 2018
by
anonymous
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last answer:
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm
single
core
cable
phase
system
peak
voltage
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690
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1
answer
asked
Apr 25, 2018
by
anonymous
The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is
The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%
Last answer:
The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%
potential
coil
single
phase
dynamometer
wattmeter
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264
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1
answer
asked
Mar 21, 2018
by
anonymous
The two pressure coils of a single phase power factor meter have?
Last answer:
The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.
two
pressure
coils
single
phase
power
factor
meter
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72
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1
answer
asked
Mar 20, 2018
by
anonymous
The running winding of a single phase motor on testing with meggar is found to be ground...
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?
Last answer:
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.
running
winding
single
phase
motor
testing
meggar
ground
location
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84
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1
answer
asked
Mar 19, 2018
by
anonymous
For the parallel operation of single phase transformers it is necessary that they should have?
Last answer:
Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers: 1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.
parallel
operation
single
phase
transformers
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111
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2
answers
asked
Aug 21, 2019
by
anonymous
working principle of single phase motor
working principle of single phase motor
Last answer:
The Stator of single phase induction motor houses two windings 1. Main (Running) winding 2. Auxiliary (Starting ) winding Rotor of single phase induction motor is ... with starting winding or a capacitor may be permanently connected in series with Auxiliary (Starting ) winding.
single
phase
motor
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93
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1
answer
asked
Jul 26, 2019
by
anonymous
Explain construction and working principle of single phase transformer.
Explain construction and working principle of single phase transformer.
Last answer:
A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.
construction
working
principle
single
phase
transformer
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326
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4
answers
asked
Aug 11, 2018
by
anonymous
State advantages of three phase over single phase.
State advantages of three phase over single phase.
Last answer:
Advantages of 3-phase system over 1-phase system: - 1. More output: For the same size, output of poly-phase machines is always higher than single phase machines. 2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.
advantages
three
phase
single
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2.8k
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4
answers
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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223
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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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68
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0
answers
asked
Mar 11, 2018
by
anonymous
Describe the gate circuit for a single phase full converter.
Describe the gate circuit for a single phase full converter.
gate
circuit
single
phase
full
converter
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58
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0
answers
asked
May 21, 2020
by
anonymous
Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Last answer:
Circuit Diagram: Waveforms:
single
phase
full
wave
mid-point
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177
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1
answer
asked
May 16, 2020
by
anonymous
Single phase transformer
Single phase transformer
Last answer:
Single phase Transformer Transformer
single
phase
transformer
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234
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1
answer
asked
May 7, 2020
by
anonymous
Explain MCB and ELCB with connection diagram supplying single phase load.
Explain MCB and ELCB with connection diagram supplying single phase load.
Last answer:
OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.
explain
mcb
and
elcb
with
connection
diagram
supplying
single
phase
load
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196
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1
answer
asked
May 7, 2020
by
anonymous
State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders
State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders
Last answer:
Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor
state
suitable
single
phase
motor
for
following
applications
i
table
fan
ii
mixers
and
grinders
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52
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1
answer
asked
Mar 20, 2018
by
anonymous
Single phase induction motor usually operates on?
Last answer:
Single phase induction motor usually operates on 0.6 power factor lagging.
single
phase
induction
motor
operates
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97
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1
answer
asked
Mar 20, 2018
by
anonymous
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?
Last answer:
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.
capacitor-start
single
phase
induction
motor
switched
supply
capacitor
inductor
equivalent
reactance
value
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100
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1
answer
asked
Mar 18, 2018
by
anonymous
An unexcited single phase synchronous motor is ?
An unexcited single phase synchronous motor is ?
Last answer:
An unexcited single-phase synchronous motor is reluctance motor.
unexcited
single
phase
synchronous
motor
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83
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1
answer
asked
Dec 12, 2017
by
anonymous
write short notes on single phase system.
write short notes on single phase system.
Last answer:
A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .
notes
single
phase
system
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82
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1
answer
asked
Nov 16, 2017
by
anonymous
three phase to single phase cycloconverter
three phase to single phase cycloconverter
Last answer:
three phase to single phase cycloconverter
three
single
phase
cycloconverter
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1
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396
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1
answer
asked
Nov 16, 2017
by
anonymous
single phase full converter
single phase full converter
Last answer:
single phase full converter
single
phase
full
converter
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84
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1
answer
asked
Mar 21, 2018
by
anonymous
Describe different RT level computational and sequential components used to design single function processors.
Describe different RT level computational and sequential components used to design single function processors.
Last answer:
RT-level combinational components:- To reduce the complexity in digital logic, combinational components are used, which are more powerful than logic gates. Such combinational ... during a clock edge. An asynchronous inputs value effects the circuit independent of the clock.
different
rt
level
computational
sequential
components
used
design
single
function
processors
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159
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1
answer
asked
Mar 20, 2018
by
anonymous
Which relays are used for phase faults on long line?
Last answer:
Impedance relays are used for phase faults on long line.
relays
used
phase
faults
long
line
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60
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1
answer
asked
Mar 19, 2018
by
anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Last answer:
Sandwich type winding is used in 3 phase shell-type transformer.
type
winding
used
phase
shell-type
transformer
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1
answer
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