Last Answer : Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.
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376 views
1 answer
asked
Mar 21, 2018
by
anonymous

Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.
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69 views
0 answers
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Apr 16, 2020
by
anonymous

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
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2.6k views
1 answer
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Sep 6, 2018
by
anonymous

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
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1.0k views
1 answer
asked
May 8, 2018
by
anonymous

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 ... 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
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851 views
1 answer
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Apr 28, 2018
by
anonymous

What is the lowest acceptable insulation resistance for a cable?
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100 views
0 answers
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Mar 10, 2018
by
anonymous

What is an insulation resistance test?
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66 views
0 answers
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Mar 10, 2018
by
anonymous

How to Install Insulation in Older Residences
Last Answer : How to Install Insulation in Older Residences Today's energy needs are a mounting concern for most homeowners. Making sure that your old home is adequately insulated will not only lower energy ... like sliding doors and entry doors to garages where strip insulation can be stapled in place.
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12 views
1 answer
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May 14, 2021
by
anonymous

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.
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257 views
1 answer
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Mar 25, 2018
by
anonymous

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.
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208 views
1 answer
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Mar 25, 2018
by
anonymous

What do you mean by insulation coordination?
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88 views
0 answers
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Mar 10, 2018
by
anonymous

What is double or reinforced insulation?
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76 views
0 answers
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Mar 10, 2018
by
anonymous

What is basic insulation level?
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74 views
0 answers
asked
Mar 10, 2018
by
anonymous

Insulation resistance of high voltage circuit breakers is more than (a) 1 mega ohms (b) 10 mega ohms (c) 100 mega ohms (d) 500 mega ohms
Last Answer : (c) 100 mega ohms
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33 views
1 answer

Are there any crawl space experts out there?
Last Answer : answer:Anything that I've seen done, or have tried myself, only made the nesting places that much safer and warmer. I recommend getting an estimate to have the job done by a contractor. That's one ... save very few dollars doing it myself. You can also pick the estimator's brain while they're there.
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1 view
1 answer
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Mar 1
by
anonymous

How can you reuse a can of "Great Stuff" expanding foam by Dow?
Last Answer : I’ve never been able to—didn’t think it was possible. I avoid using it until the job requires close to a full can. Be sure to wear gloves & old clothing. I’ve also had a fair number of brand new cans from which nothing came out the nozzle. Maybe they should call it “Not-So-Great Stuff”.
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3 views
1 answer
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Feb 27
by
anonymous

Define pinch off voltage and drain resistance of FET.
Last Answer : 1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.
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120 views
1 answer
asked
Sep 5, 2018
by
anonymous

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
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367 views
1 answer
asked
May 3, 2018
by
anonymous

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω
Last Answer : A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω
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189 views
1 answer
asked
Apr 28, 2018
by
anonymous

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
Last Answer : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.
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253 views
1 answer
asked
Mar 25, 2018
by
anonymous

A star circuit has element of resistance R/2. The equivalent delta elements will be?
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147 views
0 answers
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Mar 25, 2018
by
anonymous

The resistance of a few meters of wire conductor in closed electrical circuit is?
Last Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.
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355 views
1 answer
asked
Mar 25, 2018
by
anonymous

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.
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2.7k views
1 answer
asked
Sep 6, 2018
by
anonymous

Last Answer : For measuring a very high resistance we should use Meggar.
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134 views
1 answer
asked
Mar 21, 2018
by
anonymous

Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB
Last Answer : Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB
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296 views
1 answer
asked
May 8, 2018
by
anonymous

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?
Last Answer : This is because resistance of a conductor increases with increase in temperature .
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267 views
2 answers
asked
Mar 25, 2018
by
anonymous

What affect does the thickness of a wire have on its resistance?
Last Answer : Ans: The resistance of a wire decreases as its thickness increases.
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5 views
1 answer

Which of these has the lowest resistance?
Last Answer : b) Copper has the lowest resistance.
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7 views
1 answer

Name two materials that have a different electric resistance.
Last Answer : Ans: a) copper, nichrome
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5 views
1 answer
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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.
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251 views
1 answer
asked
May 7, 2020
by
anonymous

State the impact of inductance and resistance on transmission line performance
Last Answer : Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected
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188 views
1 answer
asked
May 6, 2020
by
anonymous

What do you mean by exciting resistance and exciting reactance?
Last Answer : At no-load, a transformer behaves as a highly inductive load connected to the system which contains some resistance and inductance in parallel. The resistance is called exciting resistance R0 = V1/I w and reactance is called exciting reactance, X0 = V1/I mag
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182 views
2 answers
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Apr 28, 2020
by
anonymous

Resistance
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
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95 views
1 answer
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Mar 19, 2020
by
anonymous
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what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel
Last Answer : equivalent resistance
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368 views
2 answers
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Jan 24, 2020
by
anonymous

role of the series resistance connected in PMMC movement.
Last Answer : A PMMC Instrument can be used as voltmeter by just connecting a series resistance with the moving coil. This series resistance is called Voltmeter Multiplier. This combination of moving coil and ... current whose voltage is to be measured. Ideally the resistance of voltmeter should be infinite
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161 views
1 answer
asked
Sep 4, 2019
by
anonymous

Define resistance with its unit.
Last Answer : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)
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70 views
1 answer
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Aug 19, 2019
by
anonymous

List two advantages of platinum resistance thermometer.
Last Answer : 1. The platinum resistance thermometer is stable 2. It is resistant to corrosion 3. It is resistant to oxidation
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60 views
1 answer
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Jul 27, 2019
by
anonymous

What is the mathematical relationship between resistance and conductance?
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96 views
0 answers
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Jun 29, 2019
by
anonymous
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How does the resistance of a conductor compare to that of an insulator?
Last Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.
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2.7k views
1 answer
asked
Jun 29, 2019
by
anonymous

Resistance formula
Last Answer : The formula for resistance is, Where, R = resistance in Ohms ρ = resistivity in ohm - metre l = length A = cross sectional area
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130 views
2 answers
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Jun 11, 2019
by
anonymous

Parallel Reactance and Resistance Example 1
Last Answer : Parallel Reactance and Resistance Example 1
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150 views
2 answers
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May 30, 2019
by
anonymous

AC Circuits with Resistance but No Reactance
Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.
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100 views
1 answer
asked
May 26, 2019
by
anonymous

Problems on resistance and resistivity
Last Answer : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY
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105 views
1 answer
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May 21, 2019
by
anonymous

Problem on temperature coefficient of resistance 3
Last Answer : Problem on temperature coefficient of resistance 3
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83 views
1 answer
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May 20, 2019
by
anonymous

Problem on temperature coefficient of resistance 2
Last Answer : Problem on temperature coefficient of resistance 2
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79 views
1 answer
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May 20, 2019
by
anonymous

Problem on temperature coefficient of resistance 1
Last Answer : Problem on temperature coefficient of resistance 1
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1 answer
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May 19, 2019
by
anonymous

Problem on resistance and resistivity 13
Last Answer : Problem on resistance and resistivity 13
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77 views
1 answer
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May 19, 2019
by
anonymous

Problem on resistance and resistivity 12
Last Answer : Problem on resistance and resistivity 12
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71 views
1 answer
asked
May 19, 2019
by
anonymous

Problem on resistance and resistivity 11
Last Answer : Problem on resistance and resistivity 11
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59 views
1 answer
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May 19, 2019
by
anonymous

Problem on resistance and resistivity 10
Last Answer : Problem on resistance and resistivity 10
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65 views
1 answer
asked
May 19, 2019
by
anonymous
