RTU 2016 Question Paper Semester VI Electrical Engineering Power System Instrumentation

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B. Tech. VI-Sem. (Main/Back) Exam., April/Nlay-2016
Electrical Engineering
Irl 68E;6.2 L Power System Instrumentation
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Common with EE, EX
Time: 3 Hours Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
I nstructions to Candidste 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 may suitably be assumed
and stated clearly.
Units of quantities used"/ calculated must be stated clearly.
Use of following supporting material is permitted during examination.
(Mentioned in form No. 205)
I. NIL 2. NIL

Q.1 (a) Define the following for Gaussian distribution of data: t8l

(i) Precision index
(ii) Probable error
(iii) Standard deviation of mean
(iv) Standarddeviation of standard deviation

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(b) A ckcuit was turned for resonance by eight different students and the frequency
of resonance in KHz were recorded as' t8l

532, 548, 543, 535, 546, 531, 543, 536 calculate the

(i) Arithmetic means

(ii) Standarddeviation
(iii) Deviation from means
(iv) Variance
(v) Average deviation
OR

Explain the systematic error and classify the systematic error . t8l
Q.1 (a)
(b) Current was measured during a text 30.44, flowing in Resister
by 105Ct' It was

precent ammeter and
discovered later that the ammeter reading was low by 1,.2

percentages of the
marked resistance was high by 0.3Vo find the true power as a

power that was original$ calculated' t8l

UNIT-II
strain quake'
Q.2 (a) Develop the relation between quake factor and Poisson ratio in t8l
\/
(b) Define ctrassification of transducer. t8l

OR
Explain the rnethod of temperature measurement with use of :- t8l
Q.2 (a)
(i) RTDs
(ii) Thermistor
(b) Explain the construction and working principle of LVDT t8l

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UNIT-III
t8l
function generator'
Q.3 (a) Write down short note on
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arnplifier with op - alnp'
(b) Explain the instrumentation

G
t8l
circuit in detail'
Q.3 (a) Explain samPle and hold
to current
voltage converter and temPerature
(b) Explain the frequencY to
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converter.

UNIT.IV
connection usmg
of power and power factor in delta
Q.4 (a) Explain the measurement
tBl
two wattmeter method'
two
system in measured bY
(b)
- 3 wire balanced load
The power flowing in 3 0 -
t8l
wattmeter method'

ThereadingofwattmeterAinT500WandreadingofwattmeterBin_1500w

(i) What is Power factor of sYstem'

(ii)Ifthevoltageofcircuitis400v,whatisthevalueofcapacitancewhichmust
measured to
phase to cause the whole power of power
be introduced in each

the frequency in 50Hz'
appearan wattmeter A

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Fage 3 of4

OR

Q.4(a)Explainthemeasurementofreactivepowerusingl-Qvarmeterandalsodrawits
t8l
Phasor diagram'
in power frequency
(b) what are the different methods of measurement of frequency
range? Explain resonance type
frequency meter' t8]

T]NIT.V
-
transformer. Drive
circuit and phasor diagram of current
Q.s (a) Draw the equivalence
angle error' t8l
the expression for ration and phase
t8l
(b) Explain the effect of following on the performance of CT
(i) Change in primary winding culrent
(ii) Change in secondary circuit burden
(iii) Change in frequencY
OR

voltage transformer' t8l
Q.s (a) Explain the working principle of capacitive
voltage transformer. t8l
(b) Describe transient behavior of capacitive

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