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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 4
1.
A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
0.001 Ω
0.1001 Ω
100 Ω
1000 Ω
Answer: Option
Explanation:

.

2.
The use of thermocouple meters for ac measurement leads to a scale which is
linear
square law
logarithmic
exponential
Answer: Option
Explanation:

Thermocouple meter is based on heating effect which varies as I2.

3.

Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.

Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:

CT and PT cannot be used in dc.

4.
The scale of dynamometer wattmeter is non linear.
True
False
Answer: Option
Explanation:

It is linear.

5.
Magnetic deflection is inversely proportional to
voltage
(voltage)0.5
(voltage)1.5
(voltage)2
Answer: Option
Explanation:

where VA is the potential difference between anode and cathode.

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