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D.C. shunt relays are made of?
asked
Mar 19, 2018
by
anonymous
D.C. shunt relays are made of?
d
c
shunt
relays
made
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1
Answer
answered
Mar 19, 2018
by
anonymous
D.C. shunt relays are made of
many turns of thin wire.
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asked
Apr 27, 2020
by
anonymous
List the main parts of D.C. motor
List the main parts of D.C. motor
Last answer:
Main parts of D.C. motor and their functions: Part Functions Yoke i) Provides mechanical support for poles. ii) Acts as protecting cover for machine. iii) Carries magnetic flux. ... a fixed physical position relative to the stator. Shaft Used to transfer mechanical power
list
the
main
parts
of
d
c
motor
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answer
asked
Apr 27, 2020
by
anonymous
Write two applications of D.C. series motor.
Write two applications of D.C. series motor.
Last answer:
The applications of D.C. series motor: 1. Cranes 2. Hoists 3. Trolley and cars 4. Conveyors 5. For traction work i.e. electric locomotives 6. Elevator 7. Air compressor
write
two
applications
of
d
c
series
motor
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58
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1
answer
asked
Apr 27, 2020
by
anonymous
State the principle of operation of d.c. motor.
State the principle of operation of d.c. motor.
Last answer:
When a current carrying conductor is placed in a magnetic field, the conductor experiences the force. The magnitude of force is given by F = BIL newton where F – Force B – maximum flux density I – Current L – Length of conductor
state
the
principle
of
operation
d
c
motor
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1
answer
asked
Jun 29, 2019
by
anonymous
Briefly define each of the following: (a) 1 coulomb (b) 1 volt (c) 1 ampere (d) 1 ohm.
Briefly define each of the following: (a) 1 coulomb (b) 1 volt (c) 1 ampere (d) 1 ohm.
briefly
define
each
of
the
following
a
1
coulomb
b
volt
c
ampere
d
ohm
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78
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0
answers
asked
Mar 20, 2018
by
anonymous
The inverse definite mean time relays are used for over current and earth fault protection of transformer against?
Last answer:
The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.
inverse
definite
mean
time
relays
used
over
current
earth
fault
protection
transformer
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2.5k
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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
Mar 20, 2018
by
anonymous
Discrimination between main and backup protection is provided by the use of relays which are?
Last answer:
Discrimination between main and back up protection is provided by the use of relays which are slow.
discrimination
between
main
backup
protection
use
relays
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303
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1
answer
asked
Mar 20, 2018
by
anonymous
To protect most of the electrical equipment handling low power, the types of relays used are?
Last answer:
To protect most of the electrical equipment handling low power, the types of relays used are thermocouple, electronic and bimetallic.
low
power
types
relays
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74
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1
answer
asked
Mar 19, 2018
by
anonymous
Directional relays are based on flow of?
Last answer:
Directional relays are based on flow of power.
directional
relays
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117
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1
answer
asked
Mar 19, 2018
by
anonymous
Overload relays are of?
Last answer:
Overload relays are of induction, solid state, thermal, electromagnetic type.
overload
relays
type
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48
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1
answer
asked
Apr 30, 2018
by
anonymous
IDMT relays are used to protect the transformer against :
IDMT relays are used to protect the transformer against : (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage
Last answer:
IDMT relays are used to protect the transformer against : External short circuits
idmt
relays
used
protect
transformer
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2.7k
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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 20, 2018
by
anonymous
Protective relays are devices that detect abnormal conditions in electrical circuits by measuring?
Last answer:
Protective relays are devices that detect abnormal conditions in electrical circuits by measuring constantly the electrical quantities which differ during normal and abnormal conditions.
protective
relays
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82
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1
answer
asked
Mar 19, 2018
by
anonymous
Thermal overload relays are used to protect the motor against over current due to?
Last answer:
Thermal overload relays are used to protect the motor against overcurrent due to heavy loads.
thermal
relays
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131
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1
answer
asked
Mar 19, 2018
by
anonymous
Relays can be designed to respond to changes in?
Last answer:
Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.
relays
designed
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80
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1
answer
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
views
1
answer
asked
Aug 17, 2019
by
anonymous
How many types of relays are there?
How many types of types of relays are there?
types
relays
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40
views
0
answers
asked
Apr 29, 2018
by
anonymous
Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred
Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred for ground fault relaying (2) Impedance relays are most suitable for:protecting long transmission lines (3) Mho relays are best suited for long transmission line protection (4) Reactance relays are widely used for protection of Medium transmission lines (A) All of them (B) (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)
Last answer:
Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred for ground fault relaying (2) Impedance relays are most suitable for:protecting long transmission lines (3) Mho relays are ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)
reactance
relays
mho
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71
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1
answer
asked
Mar 3, 2018
by
anonymous
Brushes of DC machine are made up of ?
Brushes of DC machine are made up of ?
Last answer:
Brushes of DC machine are made up of carbon.
brushes
dc
machine
made
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125
views
1
answer
asked
Mar 3, 2018
by
anonymous
From which material field coils of DC generator are made of?
From which material field coils of DC generator are made of?
Last answer:
Field coils of DC generator are usually made of copper.
material
field
coils
dc
generator
made
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96
views
1
answer
asked
Apr 28, 2018
by
anonymous
A switch tail ring counter is made by using a single D-FF. The resulting circuit is
A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF
Last answer:
A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF
switch
tail
ring
counter
made
single
circuit
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0
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65
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1
answer
asked
Mar 20, 2018
by
anonymous
The purpose of retardation test on D.C. shunt machines is to find out?
Last answer:
The purpose of retardation test on D.C. shunt machines is to find out stray losses.
dc
shunt
machines
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58
views
1
answer
asked
Mar 20, 2018
by
anonymous
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?
Last answer:
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.
speed
dc
shunt
motor
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111
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor can be increased by?
Last answer:
The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
speed
dc
shunt
motor
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88
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature torque of the D.C. shunt motor is proportional to?
Last answer:
The armature torque of the D.C. shunt motor is proportional to armature current.
armature
torque
dc
shunt
motor
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87
views
1
answer
asked
Mar 20, 2018
by
anonymous
As the load is increased the speed of D.C. shunt motor will?
Last answer:
As the load is increased the speed of D.C. shunt motor will reduce slightly.
load
increased
speed
dc
shunt
motor
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105
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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
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?
Last answer:
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.
dc
shunt
motors
speed
back
emf
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145
views
1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor more than its full-load speed can be obtained by?
Last answer:
The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
dc
shunt
motor
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91
views
1
answer
asked
Mar 20, 2018
by
anonymous
If the field of a D.C. shunt motor gets opened while motor is running?
Last answer:
If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.
field
dc
shunt
motor
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92
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
dc
shunt
motor
working
full
load
field
circuit
suddenly
opens
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99
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1
answer
asked
Mar 20, 2018
by
anonymous
For a D.C. shunt motor if the excitation is changed?
Last answer:
For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.
dc
shunt
motor
excitation
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122
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, speed is?
Last answer:
In a D.C. shunt motor, speed is independent of armature current.
dc
shunt
motor
speed
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61
views
1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. shunt motors as load is reduced?
Last answer:
In D.C. shunt motors as load is reduced the speed will remain almost constant.
dc
shunt
motors
load
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52
views
1
answer
asked
Mar 20, 2018
by
anonymous
Shunt capacitance is neglected while considering?
Last answer:
Shunt capacitance is neglected while considering short transmission line.
shunt
capacitance
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61
views
1
answer
asked
May 1, 2018
by
anonymous
The IC chips, used in computers, is made of
The IC chips, used in computers, is made of (1) Iron oxide (2) Silicon (3) Graphite (4) Silica
Last answer:
2 These are made on silicon wafers which is aa semi conductor. ...
ic
chips
used
computers
made
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81
views
2
answers
asked
Mar 20, 2018
by
anonymous
The rotor of a hysteresis motor is made of?
Last answer:
The rotor of a hysteresis motor is made of chrome steel.
rotor
hysteresis
motor
made
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0
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39
views
1
answer
asked
Mar 21, 2018
by
anonymous
Standard resistor is made from?
Last answer:
Standard resistor is made from maganin.
standard
resistor
made
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0
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43
views
1
answer
asked
Mar 18, 2018
by
anonymous
A synchronous motor can be made self starting by providing?
A synchronous motor can be made self starting by providing?
Last answer:
A synchronous motor can be made self-starting by providing damper bar.
synchronous
motor
made
self
starting
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0
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94
views
1
answer
asked
May 21, 2020
by
anonymous
For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
Last answer:
Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.
class
d
commutation
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57
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1
answer
asked
Oct 13, 2019
by
anonymous
Class D commutation
Class D commutation
Last answer:
Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.
class
d
commutation
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0
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66
views
1
answer
asked
Jul 1, 2019
by
anonymous
A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?
A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?
Last answer:
The current is 10.0A. 1ampere = 1 Coulomb per 1 second. 0.1Coulombs ÷ 0.01seconds = 10.0amperes.
a
charge
of
0
1
c
moves
past
given
point
every
01
s
how
much
is
the
current
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166
views
1
answer
asked
May 27, 2019
by
anonymous
X L and X C in Series
X L and X C in Series
Last answer:
Inductive reactance X L and Capacitive reactance X C in series. Inductive reactance X L of value 60 ohm and Capacitive reactance X C of value 40 ohm are connected in series. 120 volts A C voltage is ... . The current will be 6 ampere. This time current will lead the voltage by 90 degree.
x
l
and
c
in
series
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0
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74
views
1
answer
asked
Mar 15, 2018
by
anonymous
Can I use C++ for Arduino?
Can I use C++ for Arduino?
use
c
arduino
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0
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71
views
0
answers
asked
Mar 10, 2018
by
anonymous
Is Arduino based on C or C++?
Is Arduino based on C or C++?
arduino
c
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0
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52
views
0
answers
asked
Aug 25, 2019
by
anonymous
If field current is decreased in shunt dc motor, the speed of the motor
If field current is decreased in shunt dc motor, the speed of the motor (a) remains same. (b) increases. (c) decreases. (d) none of the above.
Last answer:
increases
shunt
dc
motor
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1.5k
views
4
answers
asked
Jul 27, 2019
by
anonymous
State any four applications of DC shunt motor.
State any four applications of DC shunt motor.
Last answer:
Applications of DC shunt motor: 1) Lathe machines 2) drilling machines 3) milling machines 4) Printing machinery 5) Paper industry 6) centrifugal and reciprocating pumps 7) blowers 8)fans
dc
shunt
motor
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0
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79
views
2
answers
asked
Jul 23, 2019
by
anonymous
Use of shunt reactor in substation
shunt
reactor
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0
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54
views
0
answers
asked
Jul 5, 2019
by
anonymous
Why does the speed of a DC shunt motor decrease as the load increases?
Why does the speed of a DC shunt motor decrease as the load increases?
Last answer:
Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.
why
does
the
speed
of
a
dc
shunt
motor
decrease
as
load
increases
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2.5k
views
1
answer
asked
Sep 6, 2018
by
anonymous
State the use of shunt and series resistance used in extension of meter.
State the use of shunt and series resistance used in extension of meter.
Last answer:
Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.
shunt
series
resistance
used
extension
meter
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53
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1
answer
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