DipIETE
– ET (OLD SCHEME)
Code: DE11 Subject: ELECTRONIC INSTRUMENTATION & MEASUREMENTS
Time: 3 Hours
Max. Marks: 100
NOTE: There are 9 Questions in all.
· Question 1 is
compulsory and carries 20 marks. Answer to Q.1 must be written in the space
provided for it in the answer book supplied and nowhere else.
· Out of the
remaining EIGHT Questions, answer any FIVE Questions. Each question carries 16
marks.
· Any required data
not explicitly given, may be suitably assumed and stated.
Q.1 Choose the correct or the best alternative in the following: (2
10)
a. In measurement
systems, which of the following static characteristics are desirable?
(A) Accuracy. (B) Sensitivity.
(C) Reproducibility. (D)
All of the above.
b. A reading is
recorded as 23.90 C. The reading has ________.
(A) three
significant figures (B)
five significant figures
(C) four significant figures (D)
None of the above
c. In a CRT the
focusing anode is located __________.
(A) between pre-accelerating and accelerating
anodes
(B) after accelerating anode
(C) before pre-accelerating anode
(D) None of the above
d. A vertical
amplifier for a CRO can be designed __________.
(A) only for a high gain.
(B) only for a broad bandwidth
(C) a constant gain times bandwidth product
(D) All of the above.
e. Maxwell’s
inductance-capacitance bridge is used for measurement of inductance
of__________.
(A) low Q coils (B) medium Q coils
(C) high Q coils (D) low and medium Q coils
f.
Hall effect transducers can be used for measurement of __________.
(A) Power
(B) Current
(C) Displacement (D) all of the above
g. In a digital
frequency meter, the Schmitt trigger is used for__________.
(A) converting
sinusoidal waveforms into rectangular pulses
(B) scaling of sinusoidal
waveforms
(C) providing time base
(D) none of the above
h. The desirable
characteristics of a signal source are___________.
(A) the frequency of the signal should
be well known and stable
(B) the amplitude of
a signal source should be controlled from very
small to relatively large
values
(C) the output signal should be free
from distortion
(D) All of the above.
i. One of the
following is an active transducers:
(A) Strain gauge (B) Selsyn
(C) photovoltaic cell (D) photo emissive
cell.
j. Peizo-electric
transducers are_________.
(A) passive transducers (B) active transducers
(C) inverse transducers (D) (B) and (C)
Answer any FIVE
Questions out of EIGHT Questions.
Each question
carries 16 marks.
Q.2 a. What
is Standard? Describe briefly the different types of standard used in
measurement. (8)
b. With a suitable block diagram explain the
basic digital multimeter. (8)
Q.3 a. Draw
the block diagram of the horizontal sweep section of CRO and list different
controls of each section. (8)
b. Describe
briefly the operation of sampling oscilloscope. (8)
Q.4 a. Describe
how Wien bridge can be used for determining the frequency. (8)
b. Using block diagram describe the operation of
sweep frequency generator. (8) (8)
Q.5 a. Explain
the working of hetrodyne wave analyzer with the help of the block diagram. (8) (8)
b.
Explain any one method used for the
measurement of flux and flux density. (8)
Q.6 a. Describe
how RF power can be measured using Thermal sensor. (8)
b. Explain
how sensitivity & selectivity of a radio receiver be measured. (8)
Q.7 a. Differentiate
between active and passive transducers. Explain with the help of suitable
examples. (8)
b. Describe the principle of operation of Hall
effect transducers.
(8)
Q.8 a. Using
a piezoelectric transducer explain how pressure can be measured. (8)
b. Explain
how the frequency range of the counter be extended. (8)
Q.9 a. Describe
the operation of counter type Analog to Digital convertor. (8)
b. Explain
how phase and frequency can be measured using CRO . (8)