Recent questions tagged resistance

0 answers 13 views

What is the mathematical relationship between resistance and conductance?

asked Jun 29 by Shimroz123
1 answer 17 views

How does the resistance of a conductor compare to that of an insulator?

asked Jun 29 by Shimroz123
2 answers 24 views

Resistance formula

asked Jun 11 in Formulas by Shimroz123
2 answers 44 views

Parallel Reactance and Resistance Example 1

asked May 30 by Shimroz123
1 answer 18 views

AC Circuits with Resistance but No Reactance

asked May 26 by Shimroz123
1 answer 10 views

Problems on resistance and resistivity

asked May 21 by Shimroz123
1 answer 10 views

Problem on temperature coefficient of resistance 3

asked May 20 by Shimroz123
1 answer 10 views

Problem on temperature coefficient of resistance 2

asked May 20 by Shimroz123
1 answer 13 views

Problem on temperature coefficient of resistance 1

asked May 19 by Shimroz123
1 answer 8 views

Problem on resistance and resistivity 13

asked May 19 by Shimroz123
1 answer 7 views

Problem on resistance and resistivity 12

asked May 19 by Shimroz123
1 answer 7 views

Problem on resistance and resistivity 11

asked May 19 by Shimroz123
1 answer 5 views

Problem on resistance and resistivity 10

asked May 19 by Shimroz123
1 answer 6 views

Problem on resistance and resistivity 9

asked May 19 by Shimroz123
1 answer 10 views

Problem on resistance and resistivity 8

asked May 18 by Shimroz123
1 answer 11 views

Problem on resistance and resistivity 7

asked May 18 by Shimroz123
1 answer 7 views

Problem on resistance and resistivity 6

asked May 18 by Shimroz123
1 answer 8 views

Problem on resistance and resistivity 5

asked May 18 by Shimroz123
1 answer 13 views

Problem on resistance and resistivity 4

asked May 18 by Shimroz123
1 answer 11 views

Problem on resistance and resistivity 3

asked May 18 by Shimroz123
1 answer 11 views

Problem on resistance and resistivity 2

asked May 18 by Shimroz123
1 answer 10 views

Problem on resistance and resistivity 1

asked May 16 by Shimroz123
1 answer 21 views

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

asked Sep 6, 2018 by Shimroz123
1 answer 15 views

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

asked Sep 6, 2018 by Shimroz123
1 answer 10 views

Write any two factors on which earth resistance depends.

asked Sep 6, 2018 by Shimroz123
1 answer 2 views

State the use of shunt and series resistance used in extension of meter.

asked Sep 6, 2018 by Shimroz123
1 answer 4 views

State the range for low and medium resistance.

asked Sep 6, 2018 by Shimroz123
1 answer 12 views

Explain V- I method of measurement of medium resistance. 

asked Sep 6, 2018 by Shimroz123
1 answer 12 views

Give classification of resistance based on their ranges.

asked Sep 5, 2018 by Shimroz123
1 answer 8 views

Define pinch off voltage and drain resistance of FET.

asked Sep 5, 2018 by Shimroz123
1 answer 6 views

Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency

asked Sep 4, 2018 by Shimroz123
1 answer 71 views

 A resistor in which the resistance changes exponentially with change in temperature is called as A) Potentiometer B) Phototransistor C) Varactor D) Thermistor 

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
1 answer 59 views

If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 15 views

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 22 views

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 45 views

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

asked May 3, 2018 in Power system by Shimroz123
1 answer 36 views

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

asked May 3, 2018 in Electrical Machine by Shimroz123
1 answer 16 views

Arc resistance  (1) increases with increase in arc current (2) decrease with increase in arc current (3) is independent of arc current (4) is independent of arc length

asked May 1, 2018 in Utilization of electrical energy by Shimroz123
1 answer 13 views

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  (C) Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

asked Apr 30, 2018 in Utilization of electrical energy by Shimroz123
1 answer 13 views

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

asked Apr 30, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 18 views

Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 56 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
2 answers 30 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 58 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

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

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 17 views

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 18 views

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

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 39 views

RC triggering is preferred over resistance triggering because (A) it provides triggering at a precise instant (B) it gives a longer duration gate pulse (C) it enables triggering at a larger value of firing angle (D) it protects the SCR against high dv/dt

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123

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