PTU B.Tech Electrical Engineering 2nd Semester May 2019 71536 ELECTRICAL MEASUREMENT and INSTRUMENTS Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 2nd Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B. Tech. (EE) PT (Sem.?2)
ELECTRICAL MEASUREMENT & INSTRUMENTS
Subject Code : BTEE-303
M.Code : 71536
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION - B & C. have FOUR questions each.
3.
Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
4.
Select atleast T WO questions from SECT ION - B & C.

SECTION-A
Q1. Answer briefly :


a) State the advantage of AC potentiometers.

b) List SI units of at least six parameters.

c) What are active and passive bridge circuits?

d) What are leakage current effects?

e) What is electromagnetic interference in instruments?

f) How the current transformer and potential transformer are connected in a circuit?

g) How the range of instrument can be extended in PMMC instruments?

h) State the advantages of Dynamometer type instruments.

i) What do you meant by hysteresis?

j) What is electromagnetic interference in instruments?
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SECTION-B
Q2. Describe the circuit of Maxwell bridge used for measurement of inductance. Derive the
conditions for balance.
Q3. Give the construction and principle of operation of potential transformer.
Q4. Describe the construction and working of PMMC instrument. Derive the equation for
deflection if the instruments are spring controlled.
Q5. Describe the step by step method for determination of BH curve of a magnetic material.

SECTION-C
Q6. Describe with help of suitable diagrams. How a DC potentiometer can be used for
calibration of voltmeter, Ammeter and wattmeter?
Q7. a) Discuss the ratio and phase angle errors in CT and PT, how they can be minimized.

b) Discuss the advantages and limitations of electromagnetic interference in

measurements.

Q8. a) Describe the construction and functioning of self balancing potentiometer.

b) Explain with neat circuit diagram the working of successive approximation type self -

balancing potentiometer.
Q9. Write short note on followings :

a) Dynamometer

b) Hays Bridge





NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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