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What is the lowest acceptable insulation resistance for a cable?
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asked
Mar 10, 2018
by
anonymous
What is the lowest acceptable insulation resistance for a cable?
lowest
insulation
resistance
cable
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asked
May 8, 2018
by
anonymous
If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance
If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be
Last answer:
If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be 0.2 mega ohm
insulation
resistance
cable
length
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1
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asked
Mar 10, 2018
by
anonymous
What is an insulation resistance test?
What is an insulation resistance test?
insulation
resistance
test
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asked
Mar 21, 2018
by
anonymous
Which is an instrument which measures insulation resistance of an electric circuit relative to earth and one another?
Last answer:
Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.
instrument
measures
insulation
resistance
electric
circuit
earth
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answer
asked
Mar 20, 2018
by
anonymous
Insulation resistance of high voltage circuit breakers is more than?
Last answer:
Insulation resistance of high voltage circuit breakers is more than 100 mega ohms.
insulation
resistance
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answer
asked
Apr 16, 2020
by
anonymous
Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.
Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.
write
measures
to
be
taken
maintain
the
insulation
resistance
of
electrical
machines
healthy
levels
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asked
Sep 6, 2018
by
anonymous
Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.
Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.
Last answer:
Following are the methods used to measure resistances:- (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester
measure
low
medium
insulation
earth
resistance
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asked
Apr 28, 2018
by
anonymous
When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially
When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because (A) Cables have a low value of capacitance which draws a high value of charging current (B) Cables have a low value of initial resistance (C) Cables have a high value of capacitance which draws a high value of charging current (D) Cables have a low value of capacitance and initial resistance
Last answer:
When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current
measuring
insulation
resistance
cables
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asked
Mar 10, 2018
by
anonymous
What is double or reinforced insulation?
What is double or reinforced insulation?
double
reinforced
insulation
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asked
Mar 10, 2018
by
anonymous
What is basic insulation level?
What is basic insulation level?
basic
insulation
level
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asked
Mar 10, 2018
by
anonymous
What do you mean by insulation coordination?
What do you mean by insulation coordination?
insulation
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0
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asked
Jul 26, 2019
by
anonymous
The lowest eigenvalue of the 2x2 matrix
The lowest eigenvalue of the 2x2 matrix
Last answer:
Linear Algebra Problem The lowest eigenvalue of the 2x2 matrix https://youtu.be/QatcRTzF7EA
lowest
eigenvalue
matrix
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1
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asked
Apr 29, 2018
by
anonymous
Which of the following has the lowest electrical conductivity?
Which of the following has the lowest electrical conductivity? A) Mercury B) Silver C) Copper D) Gold
Last answer:
Which of the following has the lowest electrical conductivity? A) Mercury B) Silver C) Copper D) Gold
lowest
electrical
conductivity
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119
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1
answer
asked
Apr 29, 2018
by
anonymous
Which of the following waveforms has the lowest form factor?
Which of the following waveforms has the lowest form factor? A) Sine wave B) Square wave C) Sawtooth wave D) Triangle wave
Last answer:
Which of the following waveforms has the lowest form factor? A) Sine wave B) Square wave C) Sawtooth wave D) Triangle wave
waveforms
lowest
form
factor
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1
answer
asked
Mar 8, 2018
by
anonymous
Which configuration has the lowest current gain ?
Which configuration has the lowest current gain ?
Last answer:
Common base configuration has the lowest current gain.
configuration
lowest
current
gain
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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
Aug 12, 2019
by
anonymous
What is the difference between a cable and a conductor?
What is the difference between a cable and a conductor?
difference
between
cable
conductor
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asked
Sep 20, 2018
by
anonymous
How rating of main switch and cable is selected for Industrial Installation.
How rating of main switch and cable is selected for Industrial Installation.
Last answer:
1. Rating of Main Switch or Fuse Rating is decided in industrial installation: Rating of main switch or fuse is based up the starting current of motor. For calculating starting current is considered 2 ... take 1.5 times the rated current or full load current. & thus cable rating is decided.
rating
main
switch
cable
industrial
installation
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asked
Aug 25, 2019
by
anonymous
State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) Minimum clearance between cable and water pipe line when running in parallel. (iii) If cable is laid through pipe what should be diameter of pipe. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ?
State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) Minimum clearance between cable and water pipe line when running in parallel. (iii) If cable is laid through pipe what should be diameter of pipe. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ?
Last answer:
(i) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr. (ii) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr ... should be minimum spacing between two cables :- Then minimum 30 cm spacing is provided between 2 cables
laying
cable
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asked
Dec 4, 2017
by
anonymous
what is the use of bedding on underground cable?
what is the use of bedding on underground cable?
Last answer:
Bedding is the layer above the lead sheath it protects the lead sheath from corrosion that means it gives chemical protection to metallic sheath(lead sheath)
underground
cable
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asked
May 7, 2020
by
anonymous
State the procedure for laying / installation of underground cable.
State the procedure for laying / installation of underground cable.
Last answer:
1) Direct laying Cable: or Trench laying method: Procedure: * For laying of a cable trench about 1.5m deep and 0.5m wide is made along the cable route. * A ... over. * Cables laid in this manner are usually plain lead covered because troughing affords good mechanical protection.
state
the
procedure
for
laying
installation
of
underground
cable
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1
answer
asked
Mar 25, 2018
by
anonymous
The insulation on a current carrying conductor is provided?
The insulation on a current carrying conductor is provided?
Last answer:
The insulation on a current carrying conductor is provided to prevent leakage of current, to prevent shock.
insulation
current
conductor
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137
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1
answer
asked
May 3, 2018
by
anonymous
The velocity of travelling wave through a cable of relative permittivity 36 is
The velocity of travelling wave through a cable of relative permittivity 36 is
Last answer:
The velocity of travelling wave through a cable of relative permittivity 36 is 0.5 x 108 m/sec
velocity
travelling
wave
cable
relative
permittivity
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368
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1
answer
asked
Mar 25, 2018
by
anonymous
The thickness of insulation provided on the conductor depends on?
The thickness of insulation provided on the conductor depends on?
Last answer:
The thickness of insulation provided on the conductor depends on the magnitude of voltage on the conductor.
thickness
insulation
conductor
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165
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1
answer
asked
Apr 28, 2018
by
anonymous
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm
Last answer:
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is 2 cm
single
core
lead
sheathed
cable
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1
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asked
Aug 18, 2019
by
anonymous
Why is "RJ-45" cable called "RJ-45" ?
Why is "RJ-45" cable called "RJ-45" ?
Last answer:
rj = registered jack 45 = is number of standard interface and contains 8 separate wires
rj-45
cable
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51
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2
answers
asked
Aug 18, 2019
by
anonymous
Why cable outer sheath is black in color?
Why cable outer sheath is black in color?
Last answer:
There are cables with different colors, for example, red, orange, grey. PVC or HDPE, the plastics that the jacket of the cable is made of, have to be UV-stabilized. Carbon black is a common and cheapest additive for it purpose
cable
outer
sheath
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665
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5
answers
asked
Aug 25, 2019
by
anonymous
desirable properties of Cable
desirable properties of Cable
Last answer:
Following are the main properties of cables: 1. Stranded Conductor: The conductor used for cable should be stranded specially for large size of cable because, To increase the flexibility ... and mechanical injury. 7. Life: The material used for cable should have long life.
cable
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1
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asked
Sep 20, 2018
by
anonymous
State functions of ; i) Cable box ii) Guard wire iii) Shackle insulator iv) Stay wire used in service connection
State functions of ; i) Cable box ii) Guard wire iii) Shackle insulator iv) Stay wire used in service connection
Last answer:
i) Function of Cable box: To hold and inspect incoming and outgoing terminals ii) Function of Guard wire : A grounded conductor placed beneath an overhead transmission line in order to ground ... in service connection: To give mechanical Support to pole, line and prevent leakage current if any
cable
box
guard
wire
shackle
insulator
stay
used
service
connection
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1
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asked
Apr 10, 2018
by
anonymous
A megger is to measure insulation resistance of a cable. The cable should be connected to
A megger is to measure insulation resistance of a cable. The cable should be connected to (a) Battery (b) DC supply (c) AC supply (d) No supply
Last answer:
Battery
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93
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1
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asked
Apr 29, 2018
by
anonymous
What is the resistance of a coil which draws 10 A and dissipates 1520 W?
What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these
Last answer:
What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these
resistance
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115
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1
answer
asked
Apr 29, 2018
by
anonymous
Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the
Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these
Last answer:
Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these
resistance
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157
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1
answer
asked
Apr 29, 2018
by
anonymous
What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is
What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these
Last answer:
What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these
resistance
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4.1k
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1
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asked
Apr 28, 2018
by
anonymous
Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor
Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor
Last answer:
C
ratio
rotor
reactance
resistance
two-phase
servo
motor
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341
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2
answers
asked
Mar 21, 2018
by
anonymous
For measuring a very high resistance we should use?
Last answer:
For measuring a very high resistance we should use Meggar.
measuring
high
resistance
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86
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1
answer
asked
Apr 29, 2018
by
anonymous
What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled?
What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same
Last answer:
Automatically the resistivity will increase as they are the factors affecting the resistivity
resistance
length
cross-sectional
area
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126
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3
answers
asked
Apr 30, 2018
by
anonymous
Resistance grounding is normally used for :
Resistance grounding is normally used for : (A) high voltage long over head transmission lines (B) low voltage short over head transmission lines (C) extra high voltage long over head transmission lines (D) all the above
Last answer:
Resistance grounding is normally used for : low voltage short over head transmission lines
resistance
grounding
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71
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1
answer
asked
Jun 29, 2019
by
anonymous
What is the mathematical relationship between resistance and conductance?
What is the mathematical relationship between resistance and conductance?
what
is
the
mathematical
relationship
between
resistance
and
conductance
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0
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asked
Apr 29, 2018
by
anonymous
What is the total resistance if 5 resistors of 20 Ω each are connected in series?
What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these
Last answer:
What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these
total
resistance
resistors
connected
series
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91
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1
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asked
Mar 15, 2018
by
anonymous
What is the relationship between power and resistance?
What is the relationship between power and resistance?
Last answer:
P = I2R Where P = power I = Current R = Resistance
relationship
between
power
resistance
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54
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2
answers
asked
Sep 20, 2017
by
anonymous
What is the unit of resistance?
Last answer:
Unit of resistance is Ohm.
unit
resistance
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52
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1
answer
asked
May 7, 2020
by
anonymous
State the procedure for testing of earth pit resistance with necessary diagrams.
State the procedure for testing of earth pit resistance with necessary diagrams.
Last answer:
Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required.
state
the
procedure
for
testing
of
earth
pit
resistance
with
necessary
diagrams
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117
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1
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asked
Sep 6, 2018
by
anonymous
State the range for low and medium resistance.
State the range for low and medium resistance.
Last answer:
Low resistances: less than 1 ohm. Medium resistances: 1 ohm to 0.1 Mega ohm.
range
low
medium
resistance
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42
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1
answer
asked
Mar 25, 2018
by
anonymous
For maximum transfer of power, internal resistance of the source should be?
For maximum transfer of power, internal resistance of the source should be?
Last answer:
For maximum transfer of power, internal resistance of the source should be equal to load resistance.
maximum
transfer
power
internal
resistance
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232
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1
answer
asked
Jan 24, 2020
by
anonymous
what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel
what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel
Last answer:
equivalent resistance
equivalent
resistance
resistors
series
parallel
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107
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2
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asked
Mar 11, 2018
by
anonymous
What is meant by resistance heating?
What is meant by resistance heating?
resistance
heating
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58
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0
answers
asked
Sep 6, 2018
by
anonymous
Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.
Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.
Last answer:
Methods for measurement of low resistance: 1. Ammeter voltmeter method 2. Kelvin's bridge method 3. Ohm meter method 4. Potentiometer method 5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible. 2. Connection errors.
methods
measurement
low
medium
high
resistance
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2.5k
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1
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asked
Sep 30, 2017
by
anonymous
can we use potentiometer for measuring resistance?
Last answer:
Yes we can use potentiometer for measuring resistance.
potentiometer
resistance
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57
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1
answer
asked
Mar 29, 2018
by
anonymous
In RE cable the insulation resistance will be
Last answer:
In RE cable the insulation resistance will be above 20 mega ohms.
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59
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1
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asked
Mar 15, 2018
by
anonymous
What happens to the resistance when the current increases?
What happens to the resistance when the current increases?
Last answer:
Resistance reduces when current increases.
resistance
current
increases
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79
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1
answer
asked
Mar 8, 2018
by
anonymous
What should be the ideal resistance of ammeter ?
What should be the ideal resistance of ammeter ?
Last answer:
Ideal resistance of ammeter should be zero.
ideal
resistance
ammeter
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...