RTU 2016 Question Paper Semester IV Electronics and Communication Engineering Electronic Measurement & Instrumentation

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t{ B.Tech. IV-Sem (Main & Back) Examl June-July 2016
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Electronics & Communication
+ 4EC3A Electronic Measurement & Instrumentation

Time: 3 Hours Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
Min' Passing Marks (Otd Back): 24
I nstructions to Candi.dste s : -

Attempt any five questions, selecting one question from each unit' All
Questions carry equal marks. Schematic diagrams
must be shown
wherever necessary. Any data you feel missing suitably be assumed a'nd
stated clearlY.
Units of quantities used/ calculated must be stated clearly.
Use of foltowing supporting material is permitted during examination'

( Mentione d in form N o.20 5 )

1, NIL 2. NIL

UNIT.I

Q.1 (a) Errors in measurements can be classified as - 16+2=81

(i) Gross errors
(ii) Systematic effors
(iii) Random errors
Explain these errors by giving suitable examples. Discuss the means adopted to

minimize these errors.

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(b) A 0 - 10 A ammeter has a guaranteed
accuracy of 1.5 percent of full scale
reading' The current measured by the
instrument is 2.5 A. Calculate the
limiting
values of current and the percentage
limiting error.
t8l

Q' l (a) Define the foilowing for currriu,fftribution of data.
[2x4=$]
(i) Precision index
(ii) probable error
(iii) Standard deviation of mean \,
(iv) Standard deviation of standard deviation
(b) A resistor is measured by voltmeter - Ammeter
methods. The voltmeter reading
is 123'4 V on the 250v scale and the ammeter
reading is 283.5mA on the
500mA scare. Both meters are guaranteed
to be accurate with in +1 percent of
full scale reading. Calculate _

(i) The indicated value of resistance

(iD The limits within which the result can be guaranteed.
[4+4=31

UNIT.II
Q.2 (a) Describe the functional block diagram
of a vector impedance meter. Explain
how
phase angle measurements
are carried out with it. t 6+2=gl
(b) The self capacitance of a coil is measured
by a e meter. The circuit is set into
resonance by at2 MHz and the
tuning capacitor at 460pF. The frequency
is now
adjusted to 4MHz and resonance
conditions are obtained by tuning
capacitor at
100 PF' calcurate the varue of serf
capacitance of the coil.
tgl
[4E4732] Page 2 of 4
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q
Q.2
- - ts)
lal ):'vrDJer'-'1k'orr<;urcffragram
Fvn)o,)-.
of fo,owing fpes of erectronic
vortmeters.
(i) Voltmeters using [4+4=91
a series connected
diode.
(ii) Voltmeters using a full
wave bridge rectifier.

(b) Exptain the functioning
of an irrtegraring type
digital voltmeter.
t8l
UNIT-III
Q.3 (a) Derive an expression
for vertical deflection
of an electron beam
(b) Describe in derail, in a CRT.
tgl
the construction and
working on analog
oscil.loscope. Explain
type storage
the principle of secondary
emission.
tO*Z=g1

Q': (a) The deflection sensitivity
q
of an oscilroscope is
35 v/cm.rf rhe distance
deflection plates from the
to the cRT screen
is 16 crl, the rength
of the deflection prates
2'5 cm' and the distance is
between the deflection
prates is 1.2cm.
acceleration anode
what is the
voltage?
(b) Describe the following t8l
types of oscilloscope:_
(i) Dual rrace type
(ii) Dual beam type
[4+4=91

UNIT-IV
Q.4 (a) what is a frequency
synthesizer? Describe
(b) its circuit in detail.
Describe the working
of a harmonic distortion t8l
diagram. analyzer with a
suitable block

[4E4732]
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of4
I42o01

B
generator' what
are the
sweep frequency
the working of a
e.4 (a) Describe #;
enors?

(b)Describethebasiccircuitofaspectrumala|yzet.Explainhowthespectraofthe
[4+4=81

following are disPlaYed:

(1) AmPlitude modulated signals
(ii) FrequencY modulated signals
UNIT.V
transducers'
characteristics of forlowing temperature
the working and
e.5 (a) Exprain
(i) RTD [4+4=81

(iD ThermocouPle
gauges and derive the expression
of wire wound strain
(b) ExPlain the constnrctron t8l
for the gauge factor'
B
Q.s (a) ExplaintheworkingofultrasonicflowmetQrswithasuitablediagram.tSl
and draw its electric
equivalent
of piezoelectric transducers
(b) Explain the working t8l
circuit.

[4200]
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