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Tuesday, August 30, 2016






S.B. Roll. No. __________
ELECTRICAL MEASURING INSTRUMENTS AND INSTRUMENTATION
4th Exam/Elect/2052/5266/Dec’11
Duration 3 Hrs.
Section A
Q1. Fill in the blanks
a. In an indicating instruments controlling torque is always appears the __________ torque.
b. Energy meter is __________ instrument.
c. The internal resistance of voltmeter is __________.
d. The steady speed of the disc in an energy meter is achieved when __________.
e. The reading of meggar is __________ if the measuring terminals are open circuited
f. For construction of core of CT, usually the material used is __________.
g. In an electrical resonance type frequency meter, the capacitor connected across __________.
h. The time base circuit is also called the __________ generator.
i. Digital multicenter is basically a __________.
j. Max well wean bridge is used to measure __________.
k. When two wattmeter are connected in delta system, the phase current is equal to __________.
l. When the average velocity of flowing liquid is slow, the flow is said to be __________.
m. Self generating type transducers are called __________.
n. The flicking of the lamp placed on the central limb of the magnetic core of a synchroscope depend upon __________.
o. On the moving system of an earth tester __________ coils are mounted on the same spindle.
Section B
Note: Attempt any five questions
Q2 i. Name different types of torques provided in indicating type instruments and explain in brief why these torques are required?
ii. Differentiate between indicating, recording and integrating instruments.
iii. What is the difference between ammeter and voltmeter?
iv. Describe with neat sketch, the principle and construction of dynamometer type watt meter?
v. What are the sources of error in an induction type watt hour meter?
vi. Describe the difference between CT and PT.
vii. Describe the construction and working of a Wright demand indicator?
viii. What do you mean by transducer? Explain.
ix. Describe the principle and construction of a meggar.

Section C
Note: Attempt any five questions
Q3. Describe the principle and working of a single phase power factor meter.
Q4. What are the various electrical quantities which are generally measured by a multimeter? How is resistance measured by a multimeter.
Q5. Explain the working of oscilloscope with a block diagram.
Q6. Describe the two wattmeter method for the measurement of power in a 3 phase balanced load system. How does the wattmeter reading vary with the power factor?
Q7. Describe the working of a float of measuring of displacement of surface of liquid.
Q8. Write short notes on
a. Phase sequence indicator

b. Thermocouple

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