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Test: Measurement of Low Resistance - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Measurement of Low Resistance

Test: Measurement of Low Resistance for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Measurement of Low Resistance questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Measurement of Low Resistance MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Measurement of Low Resistance below.
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Test: Measurement of Low Resistance - Question 1

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

Detailed Solution for Test: Measurement of Low Resistance - Question 1

The contact and lead resistances form a part of the circuit whose resistance is very high. As a result the contact and lead resistances are usually neglected compared to the high resistance value.

Test: Measurement of Low Resistance - Question 2

Which is the most popular method for measuring low resistance?

Detailed Solution for Test: Measurement of Low Resistance - Question 2

Kelvin’s double bridge is used for the measurement of low resistances of the order of 1ῼ or less. Ammeter voltmeter method is used for the measurement of current flowing through and the voltage across the circuit.

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Test: Measurement of Low Resistance - Question 3

Low resistance refers to _________

Detailed Solution for Test: Measurement of Low Resistance - Question 3

Low resistance refers to resistance of the order of 1ῼ or less than that. Medium resistances range from above 1ῼ to a few kῼ. Any resistance value greater than a few kῼ is known as high resistance.

Test: Measurement of Low Resistance - Question 4

What is the significance of measuring low resistances?

Detailed Solution for Test: Measurement of Low Resistance - Question 4

When measuring low resistances of the order of 1 ῼ or even less, lead and contact resistances of the order of even 0.002 ῼ cannot be neglected. High currents flow through low resistance circuits.

Test: Measurement of Low Resistance - Question 5

Fig 15.1 represents?

Detailed Solution for Test: Measurement of Low Resistance - Question 5

Fig 15.1, illustrates the construction of low resistance. A is an ammeter used to measure current through the circuit, while V is the voltmeter used to measure voltage.

Test: Measurement of Low Resistance - Question 6

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

Detailed Solution for Test: Measurement of Low Resistance - Question 6

The voltage drop measured across a low resistance does not contain any contact and lead resistances of the components and is independent of it.

Test: Measurement of Low Resistance - Question 7

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

Detailed Solution for Test: Measurement of Low Resistance - Question 7

As the current flowing through a low resistance circuit is low, the voltage drop across the terminals due to contact and lead resistances is negligible. Thermal e.m.f occurs in a circuit when its temperature increases due to high current flow.

Test: Measurement of Low Resistance - Question 8

In fig 15.1, the terminals aa’ are used for _________

Detailed Solution for Test: Measurement of Low Resistance - Question 8

The terminals aa’ are used for the measurement of the voltage drop across the resistance R. An voltmeter V is connected across the terminals aa’.

Test: Measurement of Low Resistance - Question 9

In the following figure, what is the value of I?

Detailed Solution for Test: Measurement of Low Resistance - Question 9

By applying Kirchhoff’s current law at the node N from fig we get,
I = IV + Ir
where,
I is the total series current flowing through the circuit
Iv is the current flowing through the voltmeter
Ir is the current flowing through the resistance R.

Test: Measurement of Low Resistance - Question 10

A simple bridge circuit consists of a network of __________

Detailed Solution for Test: Measurement of Low Resistance - Question 10

A simple bridge circuit is made of a network consisting of 4 resistance arms. Usually a galvanometer is connected between the ends of the opposite two junctions in order to measure the flow of current.

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