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

JNTU Question Papers

Electrical and Electronics Measurements 1st Sem Nov 2008

 SET-4

1. Explain in detail the Permanent magnet moving coil mechanism with construction

and temperature compensation. [8+4+4]

 

2. (a) With neat diagram explain the principle and working of AC voltmeter.

(b) An AC voltmeter calibrated for sine wave is used to measure a ramp voltage

waveform rising to a peak value of 6 V in 3 m.sec. Determine the percentage error. [8+8]

 

3. Explain in detail the working of stair case Ramp DVM, giving the block diagram.

Compare its performance with other types of DVMs. [8+4+4]

 

4. (a) Compute the value of self-capacitance of a coil when the following measure-

ments are made; at f1 = 2MHz, the tuning capacitor is set at 450 pf. When the frequency is increased to 5 MHz, the tuning capacitor is tuned to 60 pf.

(b) Draw the block diagram of the RF milli voltmeter. Explain its working. [6+10]

 

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) Explain the working functions of each block of a sampling oscilloscope in full

detail.

(b) Compare the merits and demerits of sampling oscilloscope. [10+6]

 

7. (a) With a block diagram explain AF sine -square wave oscillator.

(b) Explain the different front panel controls of a signal generator. Give the specifications with typical values. [10+6]

 

8. (a) Draw and explain the temperature compensated crystal oscillator circuit.

(b) List the suggestions to be followed to attain maximum accuracy in a frequency

counter.

(c) Explain the basic principle behind the extension of frequency range of counter.

JNTU Electrical and Electronics Measurements Question Paper

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