Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Assertion (A): Moving iron instrument can be used on ac or dc.

Reason (R): In a moving iron instrument deflecting torque is proportional to square of current.

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: A
No answer description is available. Let's discuss.
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Assertion (A): The scale a PMMC ammeter is linear.

Reason (R): The deflecting torque of PMMC is proportional to current in the coil.

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: A

Since the deflecting torque is proportional to current, the scale is linear.

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In bridge circuit of figure, equivalent resistance between A and B is
A:
1 Ω
B:
0.5 Ω
C:
2 Ω
D:
1.5 Ω
Answer: A
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An instrument of accuracy class 1 can have an error equal to
A:
+ 1% of reading
B:
± 1% of reading
C:
± 1% of full scale deflection
D:
+ 1% of full scale deflection
Answer: C
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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
A:
111 Ω ± 1.8 Ω
B:
111 Ω ± 3.75 Ω
C:
111 Ω ± 5.55 Ω
D:
111 Ω ± 1.95 Ω
Answer: C

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

Therefore, R1 + R2 = 111 ± 5.55 ohm.

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