Model Question Paper
Third Semester B.E.(CBCS) Examination
Electrical and Electronic Measurement
Time:3Hrs Max.Marks:100
Note: Answer any FIVE full questions, choosing at least ONE question from each
module
Module-I
1. a. Define Sensitivity of the Wheatstone bridge with necessary diagram, reduce the
Expression for sensitivity of bridge for SB (08 Marks)
b. With a neat diagram derive the balancing equation for kelvin's double bridge
(06 Marks)
c. Explain the sources and detectors used in AC bridges (06 Marks)
2. a. Explain the measurement of inductance using Anderson's Bridge with a neat diagram
(12 Marks)
b.With a neat diagram explain the Megger used for measurement of resistance
(08 Marks)
Module-II
3. a. Derive the Torque equation of single phase electrodynamometer type watt meter
(06 Marks)
b. Explain two wattmeter method of measurement of three phase power (08 Marks)
c. With a neat diagram explain the working of Weston frequency meter. (06 Marks)
4. a.Explain the operation of LPF type of wattmeter.(06 Marks)
b. The constant of energy meter is 800 revolutions /KWh. Calculate the number of
revolutionsmade by it ,when connected to a load carrying 100A at 230V 0.8 p.f
in 30 seconds .if it makes 110 revolutions in 30 seconds ,find the percentage errors
(08 Marks)
c. Explain the adjustments and calibration of single and three phase energy meters
(06 marks)
Module-III
5. a. With the help of circuit vector diagram explain Current transformer. (08 Marks)
b. Explain the Silsbee's method of testing CT. (06 Marks)
c. Write a short note on Shunt and Multipliers. (06 Marks)
6. a.A moving coil meter gives a full scale deflection with a current of 5mAr.If the coil
of the instrument has the resistance of 10Ω, how it can be adopted to work as
Ammeter of range 0-10A ii) Voltmeter of range (08 Marks)
b. List out the desirable features of ammeters and voltmeters (06 Marks)
.
c. write a note on turns compensation used in instrument transformer.. (06 Marks)
Module-IV
7. a. With neat sketch describe true R.M.S responding voltmeter (08 Marks)
b. With a neat block diagram explain Q-Meter. (06Marks)
c. Explain the working of electronic multimeter (06 Marks)
8. a.Mention the advantage of electronic instruments over conventional instruments
(06 Marks)
b. Briefly explain the essentials of electronic Instrumentation. (06Marks)
c. with a neat sketch explain the working of following:
Integrating type DVM
ii) Ramp type DVM (08Marks)
Module-V
9. a. Write a short note on the various display devices Viz. LED, LCD, Nixie tube
(08 Marks)
b With a neat sketch explain Cathode ray tubes (06 Marks)
c. Explain with a neat sketch explain Stripchart recorders (06 Marks)
10. a. Explain with a neat sketch, Electro Cardio Graph (08 Marks)
b. Write a note on.
1. Dot matrix Display ii) Bar matrix Display (06 Marks)
c. Explain LVDT type recorders (06 Marks)