JNTU Exam Papers Electrical and Electronics Measurements 1st Sem Nov 2008

JNTU Exam Papers

Electrical and Electronics Measurements 1st Sem Nov 2008


1. Explain the voltmeter sensitivity and measuring method with loading effect. [2+7+7]

2. (a) How the elements of a single phase watthour meter are connected? Explain with the help of a sketch.

(b) Describe the principle of measurement and working of a domestic watthour meter. [8+8]

3. Draw the block diagram of a dual-slope digital volt meter and explain how it is

advantageous to use dual slope A/D converter in DUM? [4+8+4]


4. Draw the basic block diagram of a vector impedance meter. Explain the functions

of each block. Also give the specifications of the above meter. [6+6+4]


5. (a) With neat block diagram explain the working function of each block of general

purpose oscilloscope.

(b) Mention the advantages of general purpose oscilloscope. [10+6]


6. (a) How much voltage is required across two deflection plates separated by 2 cms

to deflect an electron beam 1.50 if the effective length of deflection plates is 2

cms and the accelerating potential is 900 volts?

(b) What is an oscilloscope Probe compensation? How is this adjusted? What

effects are noted when the compensation is not correctly adjusted? [8+8]

7. (a) What principle is employed in the operation of a function generator?

(b) What are the ways in which isolation can be accomplished between signal

generator output and oscillator in a simple signal generator? [8+8]

8. (a) Explain an automated frequency counter using block diagram.

(b) If the internal time base of a frequency counter is 15MHz, what frequency

range is best measured by a period measurement and why.

JNTU Electrical and Electronics Measurements Nov 2008 Question Paper

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