Deemed University 2009 A.M.I.E.T.E Electronics

(C) 0.5 mA. (D) 50 mA.


g. Which of the subsequent transducer is used for magnetic flux density measurement?

(A) LVDT (B) Synchro
(C) Hall effect transducer (D) Thermocouple

h. In a Q meter, a small resistance R is added to the series resonant circuit to inject the oscillatory voltage to the circuit. If is the apparent series resistance of the circuit at resonance, the value of true Q will be

(A) . (B) Observed .
(C) . (D) .

i. Input impedance of a CRO is nearly

(A) Zero. (B) 10 .
(C) 100 . (D) one M.

j. A strain guage bridge measures the strain in a cantilever where the gauge is fixed with strain , the gauge resistance increases from 110 to 110.52 . If the gauge factor is 2.03, then strain in the cantilever will be

(A) 2.33 10-3. (B) 3.15 10-3.
(C) 3.81 10-3. (D) 4.33 10-3.



ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.



Q.2 a. discuss the subsequent terms : (8)

(i) Accuracy (ii) Dynamic fault
(iii) Settling time (iv) Precision

b. discuss various kinds of errors that occur in measuring instruments. How do you calculate fault limit? (8)

Q.3 a. elaborate elements of electronic multimeter? Draw and discuss the basic circuits of this instrument. (8)

b. describe Q factor of a coil. discuss with circuit diagram the construction and working of a basic Q meter. (8)

Q.4 a. define with block diagram a sweep frequency generator and its applications. (8)

b. Draw the schematic of digital frequency meter and discuss its operation. (8)
Q.5 a. Why CRO is considered to be most versatile instrument in an electronic
Laboratory? define the working principle of a CRO with the help of
its block diagram. (8)

b. discuss with the help of schematic diagram the working of a storage
oscilloscope. (8)

Q.6 a. Why magnetic measurements are more right then other kinds of
measurement? How will you find hysteresis loop of a material under
AC operating conditions. (8)

b. define Bolometer method for power measurement (8)

Q.7 a. How does a wave analyser differ from harmonic distortion analyser?
define harmonic distortion analyser with the help of a block diagram. (8)
b. describe sensitivity. How is it measured? (8)
Q.8 a. Why selection of transducer is important? provide the points to be considered in determining a transducer suitable for a specific measurement ? (8)

b. What is Hall effect? define the working principle, and applications of
Hall effect. (8)

Q.9 a. discuss a 4-bit R-2R ladder kind of DAC. Compare it with weighted
resister kind DAC. (8)

b. What is multiplexing? discuss frequency division and time division
multiplexing. (8)

Earning:   Approval pending.