# Recent questions tagged resistance

What is the mathematical relationship between resistance and conductance?

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

Resistance formula

Parallel Reactance and Resistance Example 1

AC Circuits with Resistance but No Reactance

Problems on resistance and resistivity

Problem on temperature coefficient of resistance 3

Problem on temperature coefficient of resistance 2

Problem on temperature coefficient of resistance 1

Problem on resistance and resistivity 13

Problem on resistance and resistivity 12

Problem on resistance and resistivity 11

Problem on resistance and resistivity 10

Problem on resistance and resistivity 9

Problem on resistance and resistivity 8

Problem on resistance and resistivity 7

Problem on resistance and resistivity 6

Problem on resistance and resistivity 5

Problem on resistance and resistivity 4

Problem on resistance and resistivity 3

Problem on resistance and resistivity 2

Problem on resistance and resistivity 1

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

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

Write any two factors on which earth resistance depends.

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

State the range for low and medium resistance.

Explain V- I method of measurement of medium resistance.

Give classification of resistance based on their ranges.

Define pinch off voltage and drain resistance of FET.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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