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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 5
11.
The torque in induction wattmeters due to
capacitive current
electrostatic effect
hall effect
eddy currents
Answer: Option
Explanation:

Eddy currents are induced in the disc.

12.
During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are
-0.01 kWh and 0.01 kWh
0.01 kWh and -0.01 kWh
-0.01 kWh and ± 0.01 kWh
± 0.01 kWh and 0.01 kWh
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Two resistances are : R1 = 36 Ω ± 1.89 Ω and R2 = 75 Ω ± 3.75 Ω. The sum R1 + R2 along with limiting error is
111 Ω ± 1.8 Ω
111 Ω ± 3.75 Ω
111 Ω ± 5.55 Ω
111 Ω ± 1.95 Ω
Answer: Option
Explanation:

36 + 75 = 111, 1.8 + 3.75 = 5.55.

Therefore, R1 + R2 = 111 ± 5.55 ohm.

14.
An instrument of accuracy class 1 can have an error equal to
+ 1% of reading
± 1% of reading
± 1% of full scale deflection
+ 1% of full scale deflection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
In bridge circuit of figure, equivalent resistance between A and B is
1 Ω
0.5 Ω
2 Ω
1.5 Ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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