Mechanical Engineering (Semester 7)
Total marks: 75
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Part A
1.a.
Define resolution and threshold.
(2 marks)
00
1.b
How errors are classified? Enumerate the various sources of errors.
(3 marks)
00
1.c.
State the difference between thermometer and thermistor.
(2 marks)
00
1.d.
describe the constructional details and application of different types of Diaphragm pressure gauges
(3 marks)
00
1.e.
State the principles of capacitive level indicator
(2 marks)
00
1.f.
What is a turbine flow metre?
(3 marks)
00
1.g.
Define absolute humidity.
(2 marks)
00
1.h.
Explain strain gauge rosettes.
(3 marks)
00
1.i.
What is a servo mechanism?
(2 marks)
00
1.j.
Differentiate Open and closed loop control systems with a suitable examples.
(3 marks)
00
Part B
2.a.
Explain the following terms:
a) Range and span b) Resolution
c) Calibration d) Sensitivity.
(10 marks)
00
Or
3.a.
Sketch and explain with a block diagram generalized measurement system and its
elements with an example.
(10 marks)
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4.a.
State law of thermocouples. How are the laws useful in construction of thermocouple
thermometers?
(10 marks)
00
Or
5.a.
Discuss the application areas in which low pressures are maintained. List out various
indirect methods for measurement of low pressure and explain any two methods.
(10 marks)
00
6.a.
A Stroboscope projects 6000 flashes per minute on a disk mounted on the shaft of a
machine. Find the speed of the machine if the disk appears stationary and has a single
image of 10 points.
(10 marks)
00
Or
7.a.
Explain the working of mechanical tachometer with a neat sketch
(8 marks)
00
7.b
State the difference between vibrometer and accelerometer.
(2 marks)
00
8.a.
Describe the functioning of a stroboscope and explain how speed of a rotating shaft can
be measured using a single pattern and multi-pattern disc.
(10 marks)
00
Or
9.a.
How does a mechanical load cell work? Explain the principle of measuring shaft torque
using strain gauge torsion meter.
(10 marks)
00
10.a.
Draw a block diagram of closed loop control system. Describe its working for motor
speed control.
(10 marks)
00
Or
11.a.
What is a block diagram? Explain the steps involved in the preparation of block
diagrams.
(10 marks)
00
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