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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 4
11.
The current through a resistance R is shown in figure. The computed value of power is
400 ± 0.42 W
400 ± 4.6 W
400 ± 8.85 W
400 ± 10.65 W
Answer: Option
Explanation:

% error in current is 2% and % error in resistance is 0.2%.

Since P = I2R, % error in power = 2 x 2% + 0.2% = 4.2%.

12.
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
very low
low
high
almost zero
Answer: Option
Explanation:

Moving coil is voltage coil and must have high resistance.

13.
What would be the reading of voltmeter as shown in below figure. The voltmeter has a 0-1 V scale and is a 20000 Ω/V meter
0.4545 V
0.082 V
0.82 V
4.54 V
Answer: Option
Explanation:

Effective resistance of circuit

.

14.
A temperature sensistive transducer is subjected to sudden temperature change. It takes 10 seconds for transducer to reach equilibrium condition (five times time constant). The time taken to reach half of temperature difference will be
1.38 s
5 s
8.62 s
0.9 s
Answer: Option
Explanation:

The initial change is fast.

15.
Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD = 1020 Ω, the voltage V0 is
49 mV
51 mV
48 mV
45 mV
Answer: Option
Explanation:

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