Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
Which method of braking is generally used in elevators ?
asked
Mar 20, 2018
by
anonymous
method
braking
elevators
thumb_up_alt
0
like
thumb_down_alt
0
dislike
51
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
answered
Mar 20, 2018
by
anonymous
Plugging
method of braking is generally used in elevators.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Mar 20, 2018
by
anonymous
Regenerative method of braking is based on that?
Last answer:
Regenerative method of braking is based on that back e.m.f. is equal to the applied voltage.
regenerative
method
braking
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is preferred for elevators ?
Last answer:
Cumulative compound D.C. motor is preferred for elevators.
dc
motor
preferred
elevators
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
asked
Mar 20, 2018
by
anonymous
For which types of D.C. motor, dynamic braking is generally used ?
Last answer:
Shunt motors, Series motors, Compound motors
types
dc
motor
dynamic
braking
thumb_up_alt
1
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
Mar 22, 2018
by
anonymous
The braking retardation is usually in the range?
Last answer:
The braking retardation is usually in the range 10 to 15 km phps.
braking
retardation
usually
range
thumb_up_alt
0
like
thumb_down_alt
0
dislike
203
views
1
answer
asked
Aug 9, 2019
by
anonymous
Explain in brief how anti-lock braking system works
Explain in brief how anti-lock braking system works
Last answer:
An ABS is a system on motor vehicles which prevents the wheels from locking while braking stopping safely is one of the most important functions a motor vehicle can perform. Diagram: ... to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.
anti-lock
braking
system
works
thumb_up_alt
0
like
thumb_down_alt
0
dislike
48
views
1
answer
asked
Mar 20, 2018
by
anonymous
During rheostat braking of D.C. series motors?
Last answer:
During rheostat braking of D.C. series motors motor is run as a generator.
rheostat
braking
dc
series
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Mar 20, 2018
by
anonymous
Speed control by Ward Leonard method gives uniform speed variation?
Last answer:
Speed control by Ward Leonard method gives uniform speed variation in both directions.
speed
control
ward
leonard
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
102
views
1
answer
asked
May 3, 2018
by
anonymous
The self GMD method is used to evaluate
The self GMD method is used to evaluate
Last answer:
The self GMD method is used to evaluate inductance and capacitance
self
gmd
method
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
391
views
1
answer
asked
Apr 26, 2018
by
anonymous
The bridge method commonly used for finding mutual inductance is
The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge
Last answer:
The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge
bridge
method
mutual
inductance
thumb_up_alt
0
like
thumb_down_alt
0
dislike
596
views
1
answer
asked
May 15, 2018
by
anonymous
In a regenerative braking, which of the following is generally true?
In a regenerative braking, which of the following is generally true? (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage (c) Kinetic energy of the motor is dissipated in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor
Last answer:
In a regenerative braking, which of the following is generally true? (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage ... in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
49
views
1
answer
asked
Mar 20, 2018
by
anonymous
For constant torque drive which speed control method is preferred ?
Last answer:
For constant torque drive armature voltage control speed control method is preferred.
constant
torque
drive
speed
control
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
87
views
1
answer
asked
Sep 22, 2018
by
anonymous
Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer.
Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer.
Last answer:
Energy conservation techniques by installation of separate transformer / servo stabilizer: The luminous efficiency of lamps depends upon the voltage applied across the terminals. It gives its best ... the voltage constant in that installation for giving best luminous efficiency of lamps.
energy
conservation
method
installation
separate
transformer
servo
stabilizer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
95
views
1
answer
asked
Sep 5, 2018
by
anonymous
List any four errors in induction type energy meter. Give method of compensation for each.
List any four errors in induction type energy meter. Give method of compensation for each.
Last answer:
Errors in Induction Type Energy Meter with their Compensation: 1) Error due to friction: This error can be compensated by the additional shading band provided on the shunt electromagnet. 2) Phase ... error: This error can be compensated by providing a flux diverter' to the current magnet.
errors
induction
type
energy
meter
method
compensation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
721
views
1
answer
asked
Mar 20, 2018
by
anonymous
The main disadvantage of the Ward-Leonard control method is?
Last answer:
The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.
disadvantage
ward-leonard
control
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
106
views
1
answer
asked
Mar 20, 2018
by
anonymous
Annual depreciation as per straight line method, is calculated by?
Last answer:
Annual depreciation as per straight line method, is calculated by the capital cost minus the salvage value, is divided by the number of years of life.
annual
depreciation
straight
line
method
calculated
thumb_up_alt
0
like
thumb_down_alt
0
dislike
48
views
1
answer
asked
Mar 11, 2018
by
anonymous
What is the bisection method?
What is the bisection method?
bisection
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
0
answers
asked
Mar 11, 2018
by
anonymous
What is Newton Raphson Method example?
What is Newton Raphson Method example?
newton
raphson
method
example
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
0
answers
asked
May 21, 2020
by
anonymous
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last answer:
Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on.
thermal
triggering
method
scr
thumb_up_alt
0
like
thumb_down_alt
0
dislike
38
views
1
answer
asked
Apr 24, 2020
by
anonymous
Draw and explain vacuum impregnation method of varnishing.
Draw and explain vacuum impregnation method of varnishing.
draw
and
explain
vacuum
impregnation
method
of
varnishing
thumb_up_alt
0
like
thumb_down_alt
0
dislike
39
views
0
answers
asked
Sep 6, 2018
by
anonymous
Merits of two wattmeter method
Merits of two wattmeter method
Last answer:
Advantages of Two Wattmeter Method for 3-Phase Power Measurement: 1) It is used for balanced as well as unbalanced load. 2) For the star type load, it is not necessary to ... reactive volt-amperes for balanced loads also. 7) The circuit connections are independent of load connection.
merits
two
wattmeter
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
2
answers
asked
Sep 6, 2018
by
anonymous
State any two disadvantages of one wattmeter method of measurement of 3 phase power.
State any two disadvantages of one wattmeter method of measurement of 3 phase power.
Last answer:
State any two disadvantages of one wattmeter method of measurement of 3 phase power. Disadvantages of one wattmeter method:- 1. Only used for balanced load 2. It can not be used for ... connection then neutral point must be available 4. Delta connection must be opened to connect current coil.
disadvantages
wattmeter
method
measurement
phase
power
thumb_up_alt
0
like
thumb_down_alt
0
dislike
1.2k
views
1
answer
asked
Sep 6, 2018
by
anonymous
With neat diagram explain calibration of energy meter by direct loading method.
With neat diagram explain calibration of energy meter by direct loading method.
Last answer:
Calibration of Energy Meter by Direct Loading Method: There are three methods for testing/calibration: 1. Long period dial test 2. Using rotary sub- standard meter 3. Using precision grade instruments All ... of substandard meter in kWh Then % error = [(D - DS)/DS] x 100
explain
calibration
energy
meter
direct
loading
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
711
views
1
answer
asked
Sep 6, 2018
by
anonymous
Explain V- I method of measurement of medium resistance.
Explain V- I method of measurement of medium resistance.
Last answer:
In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. Take reading of voltmeter and ammeter, then value of resistance = R = V/I Ω To minimise the error take 4 to 5 observation for the same resistance and take their average.
v-
i
method
measurement
medium
resistance
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Sep 5, 2018
by
anonymous
List one advantage and one disadvantage of one wattmeter method.
List one advantage and one disadvantage of one wattmeter method.
Last answer:
Advantages: 1) Only one wattmeter is used. 2) Less number of connections. 3) Cost required is less. Disadvantages: 1) Used only for 3- Φ balanced load and not for ... be accessible for connecting the Pressure coil. 3) Delta connection must be opened to connect current coil.
advantage
disadvantage
wattmeter
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
606
views
1
answer
asked
May 3, 2020
by
anonymous
Illustrate with neat wiring diagram a single lamp control by two point method.
Illustrate with neat wiring diagram a single lamp control by two point method.
Last answer:
Single lamp control by two point method: This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.
illustrate
with
neat
wiring
diagram
a
single
lamp
control
by
two
point
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
73
views
1
answer
asked
Apr 2, 2020
by
anonymous
A parallel RLC circuit has the node equation Determine v(t) using the phasor method.
A parallel RLC circuit has the node equation Determine v(t) using the phasor method.
Last answer:
A parallel RLC circuit has the node equation Determine v(t) using the phasor method.
a
parallel
rlc
circuit
has
the
node
equation
determine
v
t
using
phasor
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
57
views
1
answer
asked
Aug 17, 2019
by
anonymous
Describe fire extinguishing method.
Describe fire extinguishing method.
Last answer:
(i) Carbon Dioxide Extinguishing Systems This type is the most suitable & widely recommended one for electrical fires. Carbon dioxide (CO2) extinguishers are normally Class C ... particles to expand chemically inhibiting combustion and expelling the oxygen thereby smothering the flames.
fire
extinguishing
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
27
views
1
answer
asked
Sep 29, 2018
by
anonymous
Draw and explain bulk correction method for power factor & control.
Draw and explain bulk correction method for power factor & control.
Last answer:
Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95).
bulk
correction
method
power
factor
control
thumb_up_alt
0
like
thumb_down_alt
0
dislike
90
views
1
answer
asked
Sep 6, 2018
by
anonymous
Write one advantage and one disadvantage each for spring control method and gravity control method.
Write one advantage and one disadvantage each for spring control method and gravity control method.
Last answer:
Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.
advantage
disadvantage
spring
method
gravity
control
thumb_up_alt
0
like
thumb_down_alt
0
dislike
351
views
2
answers
asked
Sep 5, 2018
by
anonymous
Explain spring control method with neat diagram.
Explain spring control method with neat diagram.
Last answer:
Spring Control Method: As shown in the figure the inner ends of the both springs are attahced to the spindle ,while outer end of upper spring is attached to the lever and outer end of ... the springs are twisted in opposite direction to the motion of pointer and produce controlling torque.
spring
control
method
diagram
thumb_up_alt
0
like
thumb_down_alt
0
dislike
249
views
1
answer
asked
Apr 26, 2018
by
anonymous
Compared to Gauss-Seidel method, Newton- Raphson method takes :
Compared to Gauss-Seidel method, Newton-Raphson method takes : A. less number of iterations and more time per iteration B. less number of iterations and less time per iteration C, more number of iterations and more time per iteration D. more number of iterations and less time per iteration
Last answer:
Compared to Gauss-Seidel method, Newton-Raphson method takes : A. less number of iterations and more time per iteration B. less number of iterations and less time per iteration ... of iterations and more time per iteration D. more number of iterations and less time per iteration
gauss-seidel
method
newton-raphson
thumb_up_alt
0
like
thumb_down_alt
0
dislike
842
views
1
answer
asked
Mar 22, 2018
by
anonymous
method can bring the locomotive to dead stop.
Last answer:
Plugging braking method can bring the locomotive to dead stop.
method
locomotive
dead
stop
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
1
answer
asked
Mar 11, 2018
by
anonymous
Why do we use Gauss elimination method?
Why do we use Gauss elimination method?
use
gauss
elimination
method
thumb_up_alt
0
like
thumb_down_alt
0
dislike
82
views
0
answers
asked
Jun 17, 2018
by
anonymous
Which motor is generally used in Tap Recorders?
Which motor is generally used in Tap Recorders? A) universal motor B) reluctance motor C) split phase motor D) hysteresis motor
Last answer:
Which motor is generally used in Tap Recorders? A) universal motor B) reluctance motor C) split phase motor D) hysteresis motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
55
views
1
answer
asked
Apr 10, 2018
by
anonymous
Which of the following circuit breaker is generally used in railway electrification ?
Which of the following circuit breaker is generally used in railway electrification ? (a) Air Blast circuit breaker (b) Minimum Oil circuit breaker (c) Bulk Oil circuit breaker (d) SF6 circuit breaker
thumb_up_alt
0
like
thumb_down_alt
0
dislike
114
views
0
answers
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is generally preferred for cranes and hoists ?
Last answer:
D.C. Series motor is generally preferred for cranes and hoists.
dc
motor
cranes
hoists
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
asked
Aug 17, 2019
by
anonymous
State which electric motors are generally used in electro agro systems with reason.
State which electric motors are generally used in electro agro systems with reason.
Last answer:
1) 3 phase induction motor is used in electro agro system for water pumping from wells as 3 phase ac supply is easily available, cost of induction motor is less, maintenance free being rugged ... as 1 phase ac supply is easily available for domestic purpose, repair is simple and easily available.
electric
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
Apr 11, 2018
by
anonymous
In .Net. which method is used to display a dialog box in the document window?
In .Net. which method is used to display a dialog box in the document window? A) prompt() and alert() B) alert() and confirm C) confirm() D) none of the above
Last answer:
In .Net. which method is used to display a dialog box in the document window? prompt() and alert()
thumb_up_alt
0
like
thumb_down_alt
0
dislike
56
views
1
answer
asked
Apr 28, 2018
by
anonymous
Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as
Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as (A) One-third of their synchronous speed (B) One-fifth of their synchronous speed (C) One-seventh of their synchronous speed (D) One-ninth of their synchronous speed
Last answer:
Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as One-seventh of their synchronous speed
crawling
squirrel
cage
induction
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
78
views
1
answer
asked
Mar 3, 2018
by
anonymous
In DC generators lamination core are generally made of?
In DC generators lamination core are generally made of?
Last answer:
In DC generators lamination core are generally made of silicon steel.
dc
generators
lamination
core
thumb_up_alt
0
like
thumb_down_alt
0
dislike
132
views
1
answer
asked
Apr 26, 2018
by
anonymous
Which of the following motors is being extensively used in servo applications ?
Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these
Last answer:
Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these
motors
servo
applications
thumb_up_alt
0
like
thumb_down_alt
0
dislike
146
views
1
answer
asked
May 13, 2018
by
anonymous
A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply
A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% the power return to the DC supply is (a) 78 kW (b) 58 kW (c) 38 kW (d) 48 kW
Last answer:
A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% the power return to the DC supply is 48 kW
thumb_up_alt
0
like
thumb_down_alt
0
dislike
93
views
1
answer
asked
Apr 12, 2018
by
anonymous
Which method is not used for conversion of AC to DC?
Which method is not used for conversion of AC to DC? A. Motor-generator set B. Rotary converter C. Metal rectifiers D. Dynamometers
Last answer:
Dynamometers method is not used for conversion of AC to DC.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
119
views
1
answer
asked
Mar 20, 2018
by
anonymous
The starting resistance of a D.C. motor is generally?
Last answer:
The starting resistance of a D.C. motor is generally low.
starting
resistance
dc
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
76
views
1
answer
asked
Apr 10, 2018
by
anonymous
Which access method is used for obtaining a record from a cassette tape?
Which access method is used for obtaining a record from a cassette tape? (1) Direct (2) Sequential (3) Random (4) All of the above
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
0
answers
asked
Apr 12, 2018
by
anonymous
Which method can be used for absolute measurement of resistance?
Which method can be used for absolute measurement of resistance? A. Ohm's law method B. Wheatstone bridge method C. Both A & B D. None of these.
Last answer:
Wheatstone bridge method can be used for absolute measurement of resistance.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
314
views
1
answer
asked
Sep 1, 2018
by
anonymous
High-voltage testing equipment is generally used in
High-voltage testing equipment is generally used in a. Routine testing Laboratories b. Research Laboratories c. Both of the above d. None of the above
Last answer:
High-voltage testing equipment is generally used in a. Routine testing Laboratories b. Research Laboratories c. Both of the above d. None of the above
thumb_up_alt
0
like
thumb_down_alt
0
dislike
37
views
1
answer
asked
Apr 29, 2018
by
anonymous
The storage battery generally used in electric power stations is
The storage battery generally used in electric power stations is (1) zinc carbon battery (2) lead acid battery (3) nickel cadmium battery (4) lithium -ion battery
Last answer:
The storage battery generally used in electric power stations is lead acid battery
storage
battery
used
electric
power
stations
thumb_up_alt
0
like
thumb_down_alt
0
dislike
91
views
1
answer
asked
Mar 18, 2018
by
anonymous
The damping winding in synchronous motor is generally used to?
The damping winding in synchronous motor is generally used to?
Last answer:
The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.
damping
winding
synchronous
motor
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
120
views
1
answer
...