RRB/SSC JE Electrical 2019 || Measurements Quiz 2

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Question 1

A voltmeter when connected across a dc supply, reads 124 V. When a series combination of the voltmeter and an unknown resistance X is connected across the supply, the meter reads 4 V. If the resistance of the voltmeter is 50 kΩ, the value of X is

• A1550 kΩ
• B1600 kΩ
• C1.6 kΩ
• D1.5 MΩ

Question 2

The control spring of the instrument have following dimensions:
Length = 250 mm, thickness of the strip = 0.005 mm, width of the strop = 0.55 mm, Young modulus = 129 gN/m²
Find out the torque exerted by spring when it turns through 90 °

• A0
• B
• C
• D

Question 3

The inductance of a moving iron instruments is given by . If spring constant = then find deflection for a current of 4A –

• A
• B
• C
• D

Question 4

A current of is measured by using thermocouple instrument. Reading of the instrument is –

• A1 A
• B2.4 A
• C3.4 A
• D30 A

Question 5

In a digit voltmeter, the largest number that can be read as:

• A9 9 9 9
• B0 9 9 9
• C1 9 9 9
• D5 9 9 9

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