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1. Attempt any FIVE of the
following: 10
a) State the necessity of
measurement necessity?
b) State the meaning of the
following:
(i)
Sensitivity
(ii)
Deflecting torque
c) State the full form of PMMC and
PMMI. *
d) Represent the vector representation
of power triangle.
e) State the types of errors (Any
four). **
f) State the meaning of CT’s.
g) List differences between
absolute and secondary instrument. **
h) List the errors occurring in
single phase electronic energy meter
2. Attempt any THREE of the
following: 12
a) State the desirable qualities
of measuring instrument and explain any two in brief.
b) With neat sketch of PMMC
instrument explain its working briefly.
c) List out comaprisions between
CT’s and PT’s (Any four).
d) State errors occurring in
measurement of electrical power. **
e) Define the following terms.
(i)
Precision
(ii)
Drift
(iii)
Resolution
(iv)
Back lash
f) List the types of systematic
errors and state the reasons due to which these errors occur.
g) State the purpose of
calibration of measuring instruments. Explain the procedure of calibration of
D.C.Voltmeter by using D.C. Potentiometer.
h) A permanent magnet moving coil
instrument of full scale deflection of 25 mA when P.D. across its terminal is
75 mV Calculate.
(i)
Resistance of shunt required for full scale deflection of 150 A
(ii)
Series Resistance for full scale reading 500 volts.
3. Attempt any THREE of the
following: 12
a) A moving coil instrument gives
full scale deflection of 24 mA. When a P.D. across if is 108 mV. Find the value
of – *
(i)
Series resistance for full scale deflection of 400 V.
(ii)
Find the power consumption.
b) Explain the working of single
phase electronic energy meter & Advantages with sketch. ***
c) State the merits and demerits
of power measurement using 2-wattmeter method.
d) With the neat sketch explain
working of Dynamometer type wattmeter. *
e) Describe with circuit diagram,
the working of full wave rectifier type A.C Voltmeter. **
f) A 3-phase, 500 volt motor load
has a power factor of 0.4. Two wattmeter connected to measure the input. They
show the input to be 30 KW. Find the reading of each wattmeter? *
g) List the various errors
occurred in dynamometer type & electrodynamometer type wattmeter and
describe the way of compensating any one type of error.
h) Describe with circuit diagram,
the calibration of single phase electronic energy meter using direct loading? **
i) Draw the circuit diagram for:-
(i)
Measurement of active power in 3-phase load circuit using two wattmeter.
(ii)
Measurement of reactive power in 3-phase load circuit using one wattmeter.
4. Attempt any THREE of the
following: 12
a) Draw a neat labelled diagram of
3-phase electronic energy meter. **
b) State and explain working of
phase sequence indicator with suitable sketch.
c) State/Describe the construction
and working of western type frequency meter with labelled diagram.
d) State the differences between
analog instruments and digital instruments. **
e) State the necessity and construction
of earth tester with suitable sketch. *
f) What is Trivector meter?
Describe the constructional details of Trivector meter? *
g) Describe how the following
measurements can be made with the use of CRO:
(i)
Voltage measurement
(ii)
Time period measurement
h) Describe with block diagram,
the working of function generator. *
i) Describe with block diagram;
the principle of operation of digital storage oscilloscope.
j) Describe with block diagram;
the working of digital frequency meter.
k) Describe with suitable example;
frequency measurement by Lissajous patterns on CRO.
5. Attempt any TWO of the
following: 12
a) Three identical coils each of
(4 + j5) V are connected in S far across 415V, 3-phase 50 Hz supply find
(i)
Vph
(ii)
Iph
(iii)
Wattmeter readings W1, W2.
b) Describe with sketches the
various blocks and working of signal generator. *
c) State the necessity of synchroscope
and with neat sketch explain its working. *
d) Explain with sketch, the
construction and working principle of repulsion type moving iron instrument? *
Compare repulsion type MI
instrument with attraction type MI instrument?
e) Draw a block diagram of CRO and
state the function of each block.
f) Explain the effect of power
factor on wattmeter readings in two wattmeter method of power measurement.
6. Attempt any TWO of the
following: 12
a) Draw the neat labelled diagram
showing the controls available on front panel of CRO. *
b) State the necessity of
extension of Ammeter using shunt with mathematical derivation if necessary.
c) State errors occurring in
wattmeter and suggest method for overcoming such types of errors (Any six). *
d) Explain with neat sketch:
(i)
Earth resistance measurement using earth tester *
(ii)
High resistance measurement using megger.
e) Explain with neat sketch; the
construction and working principle of Megger.
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