Measurement of Resistance MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Measurement of Resistance, a fundamental topic in the field of Electrical Measurement and Instrumentation. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Measurement of Resistance MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Measurement of Resistance mcq questions that explore various aspects of Measurement of Resistance problems. Each MCQ is crafted to challenge your understanding of Measurement of Resistance principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electrical Measurement and Instrumentation tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Measurement of Resistance MCQs are your pathway to success in mastering this essential Electrical Measurement and Instrumentation topic.

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Measurement of Resistance MCQs | Page 13 of 15

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Q121.
A voltmeter has a sensitivity of 1000 โ„ฆ/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The apparent resistance of the unknown resistor will be?

a.

20 kโ„ฆ

b.

21.43 kโ„ฆ

c.

18.57 kโ„ฆ

d.

22.36 kโ„ฆ

Discuss
Answer: (a).20 kโ„ฆ
Q122.
A voltmeter has a sensitivity of 1000 โ„ฆ/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The actual resistance of the unknown resistor will be?

a.

20 kโ„ฆ

b.

18.57 kโ„ฆ

c.

21.43 kโ„ฆ

d.

22.76 kโ„ฆ

Discuss
Answer: (c).21.43 kโ„ฆ
Q123.
A voltmeter has a sensitivity of 1000 โ„ฆ/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The error due to the loading effect of the voltmeter is ________

a.

3.33%

b.

6.67%

c.

13.34%

d.

13.67%

Discuss
Answer: (b).6.67%
Q124.
A 500 A, 50 Hz current transformer has a bar primary. The secondary burden is a pure resistance of 1 โ„ฆ and it draws a current of 5 A. If the magnetic core requires 250 Ampere-turn for magnetization, the percentage ratio error is __________

a.

10.56%

b.

-10.56%

c.

11.80%

d.

-11.80%

Discuss
Answer: (b).-10.56%
Q125.
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

Discuss
Answer: (b).Ra = Rb Rc/Rd
Q126.
A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 โ„ฆ and 2000 โ„ฆ respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 โ„ฆ. The percentage error in the measurement is?

a.

2.25 %

b.

2.35 %

c.

4.5 %

d.

4.71 %

Discuss
Answer: (d).4.71 %
Q127.
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 kโ„ฆ is connected across 600 โ„ฆ resistance and reads 5 V. The value of the known resistance is 600 โ„ฆ. The value of resistance R will be?

a.

120 โ„ฆ

b.

400 โ„ฆ

c.

1.8 kโ„ฆ

d.

2.4 kโ„ฆ

Discuss
Answer: (d).2.4 kโ„ฆ
Q128.
A DC ammeter is rated for 15 A, 250 V. The meter constant is 14.4 A-s/rev. The meter constant at rated voltage may be expressed as __________

a.

3750 rev/kW-h

b.

3600 rev/kW-h

c.

1000 rev/kW-h

d.

960 rev/kW-h

Discuss
Answer: (c).1000 rev/kW-h
Q129.
A DC ammeter has a resistance of 0.1 โ„ฆ 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 โ„ฆ

b.

0.011 โ„ฆ

c.

0.025 โ„ฆ

d.

1.0 โ„ฆ

Discuss
Answer: (c).0.025 โ„ฆ
Q130.
A 100 ฮผA ammeter has an internal resistance of 100 โ„ฆ. The range is to be extended to 500 ฮผA. The shunt required is of resistance __________

a.

20.0 โ„ฆ

b.

22.22 โ„ฆ

c.

25.0 โ„ฆ

d.

50.0 โ„ฆ

Discuss
Answer: (c).25.0 โ„ฆ
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