MEASUREMENT AND INSTRUMENTATION QUIZ

A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

± 0.045

± 0.054

± 0.056

± 0.065

TRUE ANSWER : ?
YOUR ANSWER : ?

To increase Q factor of a coil, the wire should be

long.

thin.

long and thin.

thick.

TRUE ANSWER : ?
YOUR ANSWER : ?

The measurement of a quantity

none of these.

is a comparison of an unknown quantity with known quantity.

is a comparison of an unknown quantity with standard.

is a comparison of an unknown quantity with another quantity.

TRUE ANSWER : ?
YOUR ANSWER : ?

Wien bridge is useful for measuring

Medium frequency

Very high frequency

Low frequency

High frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

In the bridge given in the figure, the reading of the high impedance voltmeter is

6.66 V.

Zero.

4.20 V.

- 3.33 V.

TRUE ANSWER : ?
YOUR ANSWER : ?

A DC potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balances at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of test cell is

1.5 V.

1.7 V.

1 V.

1.34 V.

TRUE ANSWER : ?
YOUR ANSWER : ?

A galvanometer has

Fluid friction damping

Eddy current damping

Air friction damping

Spring coil damping

TRUE ANSWER : ?
YOUR ANSWER : ?

The form factor in AC is the ratio of

Rms value to average value

Rms value to peak value

Peak value to average value

Peak value to rms value

TRUE ANSWER : ?
YOUR ANSWER : ?

For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is

1.2%

10.2%

25.2%

5.2%

TRUE ANSWER : ?
YOUR ANSWER : ?

A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads

(2 + √3/2)V.

0 V.

2 V.

5 V.

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YOUR ANSWER : ?