23042-MEASUREMENTS AND INSTRUMENTS OCT 2013 QUESTION PAPER

BOARD EXAMINATION QUESTION PAPER

OCTOBER 2013

23042-MEASUREMENTS AND INSTRUMENTS           

Department: EEE                                                                                          

Staff in charge: N.Suresh kumar                                                                 Time: 3 Hrs                                                                                                                                        Max Marks: 75

PART-A (15X1=15 Marks)                   

Answer any fifteen of the following questions

1. Define true value.
2.  Write the formula for instrument efficiency.
3.  List the three operating forces.
4. Mention the functions of measurement systems.
5. What are the two types of MC instruments?
6. Expand CT and PT.
7. Where are shunts used?
8. State use of tong tester.
9. Name the two coils in wattmeter.
10.  What is RSS meter?
11. What is meant by creep?
12. Write any two types of wattmeter.
13. Name the two types of power factor meters.
14. Mention the use of synchroscope.
15. Name any two types of frequency meters.
16. What are the types of phase sequence indicator?
17. Write the coating material on CRT screen.
18.  Name the bridge used for measurement of capacitance.
19.  All arms of schering bridge is provided with metallic screen. Why?
20. What is the main use of digital storage oscilloscope? 

PART-B (5x12=60marks)

Answer all questions

21.(A) (i)  Explain with neat sketch any two types of supports used in indicating instruments.

(ii) Explain eddy current damping in instrument with neat sketch

(Or)

 (B) (i) Write short notes on: (a)permanent magnets (b)pointers (c)scales in indicating instruments.

               (ii) How are secondary instruments classified? Give example in each.

22.(A) Explain with a neat sketch the working of an attraction type moving iron meter.

(Or)

 (B) Explain with neat sketch the construction and working of permanent magnet moving coil instrument. Derive torque equation.

23.(A) Draw and explain the block diagram of digital energy meter.

(Or)

 (B) Explain with a neat sketch, the construction and operation of three phase Energy meter.

24.(A) Explain the operation of western type frequency meter with a neat sketch.

(Or)

 (B) Explain with a neat sketch the construction and working of a three phase dynamometer power factor meter.

25.  (A)  (i)  With a neat sketch explain the constructional features of a cathode ray tube.

       (ii) Draw the circuit diagram of an Anderson Bridge and explain how the unknown induction is found.

(Or)

(B)   (i)  Draw and explain the block diagram of digital storage oscilloscope                                         and explain.

                   (ii) Draw the block diagram of CRO and explain.