23042-MEASUREMENTS AND INSTRUMENTS BOARD EXAMINATION QUESTION PAPER APRIL 2013

BOARD EXAMINATION QUESTION PAPER

APRIL 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. What is the formula for error?
2. Based on limit of error, how the instruments are classified?
3. What is the jewel that is used for bearing in instruments?
4. State a formula for correction.
5. What is the relation between θ and I in an attraction type MI?
6. PMMC meter have uniform scales. Why?
7. List the two types of instruments transformers.
8. Which type of instruments is used for AC measurements?
9.  State the formula for power in 1 –m AC circuits.
10.  In dynamometer wattmeter, which coil is found to be current coil?
11. State the use of energy meter.
12. 1 State the use of power factor meter.
13. 1  State the use of phase sequence indicator.
14. List the two types of synchroscope.
15. What type of instrument is western frequency meter?
16. List the two types of maximum demand indicator.
17. What is the use of Anderson bridge?
18. Mention any two controls of CRO?
19. Mention two parts of CRT.
20. Mention any two modes of Dual trace oscilloscope.

PART-B (5x12=60marks)

Answer all questions

21.  (A) Mention the various operating forces of measuring instruments

(Or)

(B) Explain with neat sketches the various types of supports used in indicating instruments.

22. (A) Explain with neat sketch, construction and working of PMMC meter.

(Or)

(B) Explain the construction and working of megger with neat sketch.

23.(A) Explain the construction and working of three phase wattmeter with neat sketch.

(Or)

(B) (i) What are errors and the adjustment procedures in energy meters?

      (ii) Draw the diagram only of 3 – phase energy meter.

24.(A)Explain the working of Trivector meter with neat sketch.

(Or)

(B) Explain the working of single-phase dynamometer power factor meter.

25.  (A) (i) Explain Schering bridge method to find unknown capacitance in a circuit.

       (ii) State the applications of digital storage oscilloscope.

(Or)

(B) Draw and explain the block diagram of general purpose CRO.

.