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

JNTU Question Papers

Electrical and Electronics Measurements 1st Sem Nov 2008

1. (a) Explain Tant-band suspension. [6]

(b) Draw the schematic, including values for an Ayrton shunt for a meter movement having full- scale deflection of 1mA and an internal resistance of 500 to cover the current ranges of 10, 50, 100 and 500mA. [5+5]

 

2. (a) Draw the block diagram of a true RMS measuring instrument and explain its

working.

(b) A symmetrical square wave voltage of maximum value EM and time period T

is applied to an average responding AC voltmeter with a scale calibrated in terms of the RMS value of a sine wave. Calculate the error in meter indication.

[8+8]

 

3. (a) How can one select Digital volt meter? What are the outstanding qualities to

make the selection? [3+3]

(b) Classify the Digital voltmeters. Explain the operating principle of one of the

above Digital Voltmeters. [2+8]

 

4. Write a notes on sources of error encountered in capacitance measuring meter.

Explain parasitic inductance, resistance and capacitance. [4+4+4+4]

 

5. (a) Explain the working operation of differential deflection amplifier for an oscilloscope.

(b) Give the specifications of CRO. [8+8]

6. (a) Explain the working function of each blocks of a digital storage oscilloscope.

(b) How does the digital storage oscilloscope differ from the conventional storage oscilloscope using a storage CRT? What are the advantages of each? [8+8]

7. (a) With the help of a block diagram explain an audio-range wave analyzer.

(b) Explain the applications of spectrum analyzer. [8+8]

8. (a) Draw and explain the logic diagram of a time base used for a frequency counter.

(b) Draw and explain the input signal processing circuit for the frequency counter.

(c) Define gating error. [8+6+2]

JNTU Electrical and Electronics Measurements Exam Paper Nov 2008

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