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Posted Date: 27 Aug 2008 Posted By: vindhya Member Level: Diamond
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2006 Jawaharlal Nehru Technological University Civil Engineering III B.Tech I Semester Regular Examinations, November 2006,ELECTRICAL MEASUREMENTS Question paper
Code No: RR310202 Set No. 4
III B.Tech I Semester Regular Examinations, November 2006
ELECTRICAL MEASUREMENTS
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Code No: RR310202 Set No. 4
III B.Tech I Semester Regular Examinations, November 2006
ELECTRICAL MEASUREMENTS
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) How are moving iron instruments classified? Describe briefly the construction
and working of Ballistic Galvanometer
(b) Why the scale of a moving iron instrument is non uniform? Discuss briefly
why the scale is compressed at lower and higher ends. [10+6]
2. (a) With neat sketch, explain how high currents and voltages can be measured
with the help of instrument transformers. Describe the advantages of instru-
ment transformers for extension of range of current and voltage on high voltage
a.c. systems.
(b) A current transformer with 5 primary turns has a secondary burden consisting
of a resistance of 0.16
and an inductive resistance of 1.12
. When the
primary current is 200A, the magnetizing current is 1.5A and the iron loss
current is 0.4A. Determine the expressions used, the number of secondary
turns needed to make the current ratio 100:1 and also the phase angle under
these conditions. [10+6]
3. Write short notes on the following :
(a) Errors in power measurements due to connections of wattmeter in different
ways
(b) Two wattmeter method of measuring 3 phase power
(c) Extension of wattmeter range by instrument transformers [4+6+6]
4. (a) Draw a neat sketch showing the construction of a single phase induction type
energy meter. Give the theory & operation of the instrument
(b) An energy meter is designed to make 100 revolutions of the disc for one unit
of energy. Calculate the no. of revolutions made by it when connected to a
load carrying 20A at 230volts at 0.8 pf for an hour. If it actually makes 360
revolutions, find the percentage error. [8+8]
5. Describe the constructional details and working of a 1f electro dynamometer type
of power factor meter. And also prove that special displacement of moving system
is equal to the phase angle of the system. [8+8]
6. Describe about the Kelvin double bridge for the comparison of small resistances.
Explain the precauctions followed for achieving highest prescision [16]
7. (a) Give advantages and disadvantages of Hays bridge in details
(b) A bridge consists of arm ab, a choke coil having a resistance R1 and inductance
L1. arm bc a non - inductive resistance R3. When this bridge is fed from a
source of 500Hz, balance is obtained under following conditions: R2=2410
,
R3=750
, C4=0.35µF, R4=64.5
. The series resistance of capacitance is =
0.4
. Calculate the resistance and inductance of the choke coil. The supply
is connected between a and c and the detector is between b and d. [8+8]
8. Describe the construction and working of
(a) Illiovici permeameter and
(b) Burrow’s permeameter.
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