MEASUREMENT AND INSTRUMENTATION QUIZ

An ammeter is a

Integrating instrument

Recording instrument

Secondary instrument

Absolute instrument

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It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?

100W

200W

150W

50W

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To measure 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to

± 2.5%

± 20%

± 1.5%

± 7.5 %

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The errors mainly caused by human mistakes are

systematic error.

observational error.

instrumental error.

gross error.

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Null type recorders are

LVDT recorders.

bridge recorders.

any one of the above.

potentiometric recorders.

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Kelvin’s double bridge is used to measure low resistance because

there is no thermo electric emf.

resistance variation due to temperature.

effect of contact and lead resistance is eliminated.

it has high sensitivity.

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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

1.7 V.

1.34 V.

1 V.

1.5 V.

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How many time-base circuits does a dual face CRO can have?

4.

2.

3.

1.

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Which amplifier in used in an electronic amplifier?

Power amplifier.

Butter amplifer.

Differential amplifier.

Wideband amplifier.

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Which of following are needed both for protection and metering?

Instrument transformer.

Power factor meters.

Energy meter.

Wattmeters.

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