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# Cochin University of Science and Techology (CUST) 2007 B.E Electrical and Electronics Engineering Electrical measurement and measuring instruments - Question Paper

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BTS(C) - IV - 07 - 003 (K)

B. Tech. Degree IV Semester (Special Supplementary) Examination, March 2007

EE 403 ELECTRICAL MEASUREMENTS AND MEASURING INSTRUMENTS

Time: 3 Hours    Maximum Marks: 100

Define the terms static sensitivity and instrument efficiency.

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A 100 il ammeter is used to measure the value of current in the 500 Q resistor. Calculate the:

i)    actual value current

ii)    measured value of current

iii)    the percentage error in measurement

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IX

Define the terms reproducibility drift, repeatability, accuracy and precision. Explain the loading effect due to shunt connected and series connected instruments.

Explain the principle of operation of earth reggae.

Explain the principle of operation of Wheastons bridge for resistance measurement.

OR

Explain how Anderson Bridge is used used to inductance.

Explain how Schering Bridge is used to measure capacitance.

Explain with a neat diagram the working of vemi potentiometer.

Explain the working of moving coil instruments.

OR

Explain the working of electro-static type ammeter.

Explain the working of current and potential transformer and state their uses.

Explain the working principle of dynometer type wattmeter.

Explain the working of single phase energy meter.

OR

Explain the principle of operation of cathode ray oscilloscope.

Explain the working principle of a flux meter.

Explain how Llyod Fisher square can be used for coreloss measure merit.

OR

Write short notes on:

(i)    Hibberts magnetic standard

(ii)    B.H.Curve

(iii)    Polar curve

(iv)    Flicker photometer

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