Resistance Measurement MCQ Questions & Answers

Resistance Measurement MCQs : This section focuses on the "Resistance Measurement". These Multiple Choice Questions (MCQs) should be practiced to improve the Resistance Measurement skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A 100 ?A ammeter has an internal resistance of 100 ?. The range is to be extended to 500 ?A. The shunt required is of resistance __________

A. 20.0 ?

B. 22.22 ?

C. 25.0 ?

D. 50.0 ?

Question 2

A 35 V DC supply is connected across a resistance in series with an unknown resistance R. a voltmeter having a resistance of 1.2 k? is connected across 600 ? resistance and reads 5 V. The value of the known resistance is 600 ?. The value of resistance R will be?

A. 120 ?

B. 400 ?

C. 1.8 k?

D. 2.4 k?

Question 3

A DC ammeter has a resistance of 0.1 ? and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?

A. 0.010 ?

B. 0.011 ?

C. 0.025 ?

D. 1.0 ?

Question 4

A galvanometer with a full-scale current of 10 mA has a resistance of 1000 ?. The multiplying power of a 100 ? shunt with this galvanometer is?

A. 110

B. 100

C. 11

D. 10

Question 5

A null type instrument with DC excitation is _________________

A. Wheatstone bridge

B. Hay bridge

C. Anderson bridge

D. Wien bridge

Question 6

A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 ? and 2000 ? respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 ?. The percentage error in the measurement is?

A. 2.25 %

B. 2.35 %

C. 4.5 %

D. 4.71 %

Question 7

Accuracy in a bridge measurement depends on_____________

A. Sensitivity of detector

B. Applied voltage

C. Both Sensitivity and applied voltage

D. Accuracy of indicator

Question 8

How is the contact resistance related to the circuit while measuring a low resistance?

A. independent of the type of resistance

B. it is negligible

C. depends on the e.m.f source

D. it is very high

Question 9

How is the voltage drop across a low resistance related to lead resistance?

A. it contains contact resistance

B. it depends on the magnitude of voltage drop

C. it depends on the type of null detector used

D. It does not contain any contact resistance

Question 10

In a Wheatstone bridge, which of the following is used as a null detector?

A. Ammeter

B. Galvanometer

C. Voltmeter

D. Wattmeter

Question 11

Low resistance refers to _________

A. resistances of the order of 1?

B. resistances of the order of 1k?

C. resistances of the order of 1m?

D. resistances of the order of 1M?

Question 12

Ra and Rd are the opposite arms of a Wheatstone bridge as are Rc and Rb. The source voltage is applied across Ra and Rc. Then when the bridge is balanced which one of the following is true?

A. Ra = Rc Rd/Rb

B. Ra = Rb Rc/Rd

C. Ra = Rb Rd/Rc

D. Ra = Rb + Rc + Rd

Question 13

Resistance is measured by the voltmeter-ammeter method employing DC excitation and a voltmeter is connected directly across the unknown resistance. If the voltmeter and ammeter readings are subject to maximum possible errors of ±2.4 % and ±1% respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is?

A. 1.4 %

B. 1.7 %

C. 2.4 %

D. 3.4 %

Question 14

The simultaneous applications of signals x (t) and y (t) to the horizontal and vertical plates respectively, of an oscilloscope, produce a vertical figure of 8 displays. If P and Q are constants and x(t) = P sin (4t + 30), then y(t) is equal to _________

A. Q sin (4t -30)

B. Q sin (2t +15)

C. Q sin (8t +60)

D. Q sin (4t +30)

Question 15

What are the four terminals in four terminal resistance?

A. 3 current terminals and one voltage terminal

B. Two potential terminals and two current terminals

C. Four voltage terminals

D. Four current terminals

Question 16

What is the significance of measuring low resistances?

A. voltage drop across the circuit is high

B. contact and lead resistances are appreciable

C. there is no power loss

D. no current flows through the bridge circuit

Question 17

Which is not a source of error in the measurement of low resistance?

A. contact resistance drops at the leads

B. thermal e.m.f

C. temperature effect

D. power dissipation through the circuit

Question 18

Which is the most popular method for measuring low resistance?

A. ammeter-voltmeter method

B. potentiometer method

C. kelvin double bridge method

D. ducter ohmmeter method

Question 19

Which of the following can be measured using a Wheatstone bridge?

A. Resistance only

B. Capacitance only

C. Inductance only

D. Resistance, capacitance, inductance, impedance

Question 20

Which of the following device is used for measuring low resistance value?

A. Wheatstone bridge

B. Hay bridge

C. Kelvin bridge

D. Owens bridge

Question 21

Which of the following device is used with 4 terminal resistors?

A. Wheatstone bridge

B. Hay bridge

C. Wien bridge

D. Kelvin bridge

Question 22

Who invented the Wheatstone bridge?

A. Samuel Hunter Christie

B. Sir Charles Wheatstone

C. Joseph henry

D. Andrew Kay

Question 23

Why 4 terminal resistors are used?

A. For protection

B. To overcome parasitic resistances

C. To increase current flow

D. None of the mentioned

Question 24

A 100 μA ammeter has an internal resistance of 100 Ω. The range is to be extended to 500 μA. The shunt required is of resistance __________

A. 20.0 Ω

B. 22.22 Ω

C. 25.0 Ω

D. 50.0 Ω

Question 25

A 35 V DC supply is connected across a resistance in series with an unknown resistance R. a voltmeter having a resistance of 1.2 kΩ is connected across 600 Ω resistance and reads 5 V. The value of the known resistance is 600 Ω. The value of resistance R will be?

A. 120 Ω

B. 400 Ω

C. 1.8 kΩ

D. 2.4 kΩ

Question 26

A DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?

A. 0.010 Ω

B. 0.011 Ω

C. 0.025 Ω

D. 1.0 Ω

Question 27

A galvanometer with a full-scale current of 10 mA has a resistance of 1000 Ω. The multiplying power of a 100 Ω shunt with this galvanometer is?

A. 110

B. 100

C. 11

D. 10

Question 28

A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 Ω and 2000 Ω respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 Ω. The percentage error in the measurement is?

A. 2.25%

B. 2.35%

C. 4.50%

D. 4.71%

Question 29

Low resistance refers to _________

A. resistances of the order of 1ῼ

B. resistances of the order of 1kῼ

C. resistances of the order of 1mῼ

D. resistances of the order of 1Mῼ

Question 30

Resistance is measured by the voltmeter-ammeter method employing DC excitation and a voltmeter is connected directly across the unknown resistance. If the voltmeter and ammeter readings are subject to maximum possible errors of ±2.4 % and ±1% respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is?

A. 1.40%

B. 1.70%

C. 2.40%

D. 3.40%