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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 3
1.
The current in a circuit is measured using a 150 : 1 CT If the ammeter reads 0.6 A, the circuit current is
250 A
90 A
156 A
144 A
Answer: Option
Explanation:

150 x 0.6 = 90 A.

2.
A volt ratio box should have low resistance.
True
False
Answer: Option
Explanation:

It should have high resistance.

3.
A Hall effect transducer has KH = - 1 x 10-8. If B = 1 Wb/m2, I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is
-7.5 x 10-6 V
-15 x 10-6
-20 x 10-4 V
-22.5 x 10-4 V
Answer: Option
Explanation:

.

4.
Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then
IA = IB = 7.5 A
IA = 5 A, IB = 10 A
IA = 10 A, IB = 5 A
IA = 9 A, IB = 6 A
Answer: Option
Explanation:

Currents divide in inverse proportion of resistances.

.

5.
Which of the following is not correct?
Voltmeter should have a very high resistance
An ammeter should have a very low resistance
A shunt should have a very low resistance
An electronic voltmeter draws appreciable current from source
Answer: Option
Explanation:

An electronic voltmeter draws negligible current.

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