Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 3rd Semester (Third Semester) 2015-2016 302EEE Electrical Measurment Measuring Instruments Question Paper
(Following Paper ID and Roll No. to be ?lled in your
Answer Book) '
' Roll No.
B. Tech.
(SEM. III) THEORY EXAMINATION, 2015-16
ELECTRICAL MEASURMENT & MEASURING
INSTRUMENTS
[Time:3 hou rs] [Total Marks: 100]
Section A
Paper [D : l21322/
121302/121314
l. Attempt all questions from the following : (1'0x2=20)
(a) Differentiate between accuracy and precision.
(b) What limitations were overcome by modi?ed
De-Sauty?s Bridge ?
(c) Give the range for measurment Qflow, medium and
high resistance. ?
(d) What is the need of standardization of AC
' potentidmeters ?
(6) Three resistors have the following ratings :
Rl=2000 : 5%, R2=IOOQ i 5%, R3=SOQ : 5%.
Determine the magnitude of resultant resistance
' arid limiting errors in % and in ohms if the
resistances are connected in series. .
10800 ' (1) . P.T.O.
(f)
(g)
(h)
(0
0)-
Compare digital instruments with analog
instruments.
De?ne burden of instrument transformers.
Discuss the advantage of Lloyd Fisher square over
Epstein square.
Why the secondary of current transformer should
never be open while the primary winding is
? energized ?
What Lissaj ous pattern will appear on screen when
two eqaul voltages of equal frequency but with 90%
phase displacement are applied to a CRO ?
\ Section B v
Attempt any ?ve questions from the section: (5x10=50.)
-2. (a)
(b)
3 '(a)
(b)
10800
Explain the construction and working of
electrodynamometer type wattmeter.
What are the different sources of errors in
electrodynamometer type wattmeter ? How these
errors can be corrected ?
Discuss different detectors used in a.c. bridges.
Enumerate different methods for the measurment
of inductance. '
Derive balance equation of Anderson?s Bridge
along with its phaSor diagram. Mention advantages
and disadvantages of this bridge.
(2) NEE302/EEE302/EE304
4. (a) Explain the concept behinddigital measurments.
(b) Describe the working of ramp type DVM with
suitable diagram.
5. (a) Desc'ribethe consti'uctilion and working of ?ux-
meter.
(b) Prove that the ?ux is proportional to the de?ection -
of HUX-meter.
6. (a) Describe various errors in energy meter. How are
they eliminated ?
(b) Explain why splitting is not necessary in this case
while in single phase power factor meter phase
splitting has to be done necessary by using R in
one circuit and L in other circuit of moving coils.
7. (a) Describe how high currents and voltages are
measured with the help of instrument transformers.
Draw diagram to illustrate your answer.
(b) Derive the expression for ratio and phase error in
case of current transformer.
8. Describe the construction and working of Weston type
frequency meter for the measurment of frequency.
9. (a) Explain the working of Cathode Ray Oscilloscope
(CRO).
(b) Discuss the differences between duel scope and
dual beamCRO.
10800 (3) P.T.O.
10. (a)
(b)
(C)
11. (a)
(b)
(c)
12- (a)
0))
10800
Section C
Attempt any'two questions from this section.(15x2=30)
Distinguish between the null type and de?ecting
type of instruments. Cite examples to supprt your
answer. ' '
Discuss the role of null type instrument in the
measurment of low range resistances.
Derive the condition for balance with suitable
circuit diagram ofKelvip?s Double bridge.
Describe the construction and working of a polar
type potentiometer. -
What are the functions of transfer instrument and -
the phase shifting transformer ?
Explain how iron losses can ?be measured in a
. specimen through wattmeter method.
Describe With phasor diagram, how capacitance can
? be measured bygSchering bridge.
What is the concept behind digital measurment ?
Draw the block diagram of Di gital multimeter.
.._x...__
(4) NEE302/EEE302/EE304
This post was last modified on 29 January 2020