Sarhad University, Peshawar
(Distance Education)
Subject
: Instrumentation &measurement
Time Allowed: 03 Hours
Examination: Final, Fall 2013
Total Marks:
70
NOTE: Question number 1 is compulsory. Attempt any four from the remaining questions. All
questions carry equal marks. Draw labeled diagram where necessary.
Q No 1
(a)Fill in the blanks
I.
II.
III.
IV.
V.
VI.
VII.
The SI unit of work is…………………..
Columb(C) is the unit of……………….
Kelvin temperature scale is also known as…………………………scale
Conductance is reciprocal of……………………..
The dimension of resistance is………………………
PMMC stands for…………………………
LCD stands for………………………..
(b) Select true and False
I.
II.
III.
IV.
V.
VI.
VII.
The unit of electric current is Ampere.
The unit for magnetic flux is Weber.
The dimension for voltage is [M3 LTI2].
Measurement standards are classified into five levels.
Ammeter is always connected in series with a circuit.
Swamping resistance is always made of manganin.
AND gate must have two inputs.
Q No 2 a) Draw the basic transistor circuit of FLIP-FlOPS.
b) Draw truth table and logic diagram for sacle-of-2000 counter.
Q No 3 a) Draw the block diagram for digital frequency meter.
b) What is the difference between pulse time measurement and frequency ratio
Measurement.
Q No 4 a) Briefly explain Wheatstone Bridge.
b )A Wheatstone bridge has p=3.5 KΩ ,Q=7 KΩ and S=4 KΩ when R=2 KΩ.The supply is EB=10 V
and the galvanometer has a current sensitivity of 1 µA/mm and a resistance rg=2.5
KΩ.Calculate the minimum change in R which is detectable by the bridge.
Q No 5 Breifly explain Digital RLC meter and Q-meter. Also explain low frequency signal generator.
Q No 6 a)Draw block diagram for high stable adjustable output regulator.
b) Determine the maximum and minimum output voltages available from circuit diagram
in part (a) when Vz=6 V , R2 =5.6KΩ , R3=5.6KΩ and R4=3KΩ.
Q No 7 a) Draw block diagram for distortion meter and digital spectrum analyzer.
b) A PMMC instrument has FSD of 100 µA and a coil resistance of 1 K Ohm. Calculate the shunt
resistance required to convert the instrument into an ammeter with
a) FSD=100 mA
b) FSD=1
Q No 8 write short note on any two of the following
a) Digital storage oscilloscope
b) Frequency synthesizer
c) Unregulated DC power supply