Electronics and Communication Engineering - Measurements and Instrumentation

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

A. 0.001 Ω
B. 0.1001 Ω
C. 100 Ω
D. 1000 Ω

Answer: Option B

Explanation:

.


2. 

The use of thermocouple meters for ac measurement leads to a scale which is

A. linear
B. square law
C. logarithmic
D. exponential

Answer: Option B

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.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

Answer: Option C

Explanation:

CT and PT cannot be used in dc.


4. 

The scale of dynamometer wattmeter is non linear.

A. True
B. False

Answer: Option B

Explanation:

It is linear.


5. 

Magnetic deflection is inversely proportional to

A. voltage
B. (voltage)0.5
C. (voltage)1.5
D. (voltage)2

Answer: Option B

Explanation:

where VA is the potential difference between anode and cathode.


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