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I/II
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CO’s: |
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MODEL QUESTION PAPER (CIE)
Note: Internal choice may be given in each CO at the same
cognitive level (CL).
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Test/Date
and Time |
Semester/year |
Course/Course Code |
Max Marks |
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Ex: I test/6 th weak of sem 10-11 Am |
IVSEM |
MECHANICS OF MACHINES 15ME32T |
20 |
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Year:
2016-17 |
Course
code:15ME41T |
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Name of Course coordinator : Units:1,2 Co: 1,2 Note:
Answer all questions |
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Question no |
Question |
MARKS |
CL |
CO |
PO |
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1 |
Explain lower pair and higher pairs |
05 |
U |
1 |
1,2,3,4, 5,6,10 |
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2 |
List the different types of constraint motion Explain any one. |
05 |
R |
1 |
1,2,3,4, 5,6,10 |
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3 |
A shaft
rotating at 200 r.p.m. drives another shaft at 300 r.p.m. and transmits 6 kW
through a belt. The belt is 100 mm wide and 10 mm thick. The distance between
the shafts is 4m.The smaller pulley is 0.5 m in diameter. Calculate the
stress in the belt, if it is an open belt drive, Take μ = 0.3. OR Two parallel shafts are to be connected by spur gearing. The
approximate distance between the shafts is 600 mm. If one shaft runs at 120 r.p.m. and the other at 360 r.p.m.,
Calculate the number of teeth on each wheel, if the module is 8 mm. Also determine the exact distance apart of
the shafts. |
10 |
A |
2 |
1,2,3,4, 5,6,10 |
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MODEL QUESTION PAPER
IV-
Semester Diploma Examination Course Title: MECHANICS
OF MACHINES
Time: 3 Hours] [Max
Marks:
100
Note: Answer any SIX from Part A and any SEVEN from Part B
PART-A 6x5=30 marks
1.
List the different types of constraint motion Explain any one.
2.
Explain with a neat sketch bull engine.
3.
Explain open belt and cross belt drives.
4.
Calculate the power transmitted by a
belt running over a pulley of 600 mm diameter at 200 r.p.m. The coefficient of
friction between the belt and the pulley is 0.25, angle of lap is 160° and
maximum tension in the belt is 2500 N.
5. State the laws of solid friction.
6.
Explain the method of balancing of different masses revolving in the
same plane.
7.
Explain clearly the terms ‘static balancing’ and ‘dynamic balancing’.
8.
Construct the displacement and velocity diagram for uniform velocity
motion of the follower.
9.
Discuss briefly with neat sketches the longitudinal, transverse
vibrations
PART-B 7x10=70 marks
10.
a) Explain with a neat sketch beam engine. 06
b) Differentiate between
machine and a structure. 04
11.
a)Explain With a neat sketch double crank mechanism. 05
b)Sketch
and describe Scotch-yoke mechanism. 05
12.
a)List the advantages & disadvantages
of flat belt over v-belt drive. 04
b)Develop the gear when Two parallel shafts,
about 600 mm apart are to be connected by spur gears. One shaft is to
runat360r.p.m. and the other at 120 r.p.m., if the circular pitch is to be 25
mm. 06
13.
Calculate the width of the belt taking
centrifugal tension into account..A leather belt is required to transmit 7.5 kW
from a pulley 1.2 m in diameter, running at 250 r.p.m. The angle embraced is
165° and the coefficient of friction between the belt and the pulley is 0.3. If
the safe working stress for the leather belt is 1.5 MPa, density of leather 1
Mg/m3and thickness of belt 1
10 mm, 10
14.
a) Explain with a neat sketch, limiting angle of friction. 05
b) A
60 mm diameter shaft running in a bearing carries a load of 2000 N. If the
coefficient of friction between the shaft and bearing is 0.03, Calculate the
power transmitted when it runs at 1440 r.p.m.
-05
15.
Five masses A, B, C,D and E are attached to a shaft and
revolve in the same plane. The masses of A is 200N, B is 100N, C is 160 N
respectively and their radii of rotations are equal. The angular position of
the masses B, C , D and E are 60°, 135°, 2100 and 270° from the mass
A. Calculate the magnitude of D and E for complete balance. Solve graphically -10
16.
Four masses m1, m2, m3 and m4 are 200 kg, 300 kg, 240 kg and 260
kg respectively. The corresponding radii of rotation are 0.2 m, 0.15 m,
0.25 m and 0.3 m respectively and the angles between successive masses are 45°,
75° and 135°. Calculate the position and magnitude of the balance mass
required, if its radius of rotation is 0.2m.(solve Analytically). -10
17.
Construct a cam profile to raise a valve with simple
harmonic motion through 50 mm in 1/3 of a revolution, keep if fully raised
through 1/12 revolution and to lower it with harmonic motion in 1/6 revolution.
The valve remains closed during the rest of the revolution. The diameter of the
roller is 20 mm and the minimum radius of the cam is 25 mm. The diameter of the
camshaft is 25 mm. The axis of the valve rod passes through the axis of the camshaft.
-10
18.
Define the following terms. -10
(a) Base circle, (b) Pitch
circle, (c) Pressure angle, and (d) Stroke of the follower.(e)Trace point
19.
a)Explain the term ‘whirling speed’ or ‘critical speed’ of a shaft 05
b) Discuss briefly with neat
sketches the transverse and torsional free vibrations 05
***************************************************************************************
MODEL QUESTION BANK
Diploma in Mechanical Engineering IV Semester
Course title:
MECHANICS OF MACHINES
REMEMBERING
1.
List the different types of constraint motion Explain any one.
2.
Define kinematic link. Briefly explain its types.
3.
Define following terms a) structure b)
mechanism.
4.
Define kinematic chain? Name the different types of kinematic chains.
5.
Define inversion of mechanism.
UNDERSTANDING
1. Explain kinematic chain.
give its relation
2. Explain the following terms.
a) Sliding pair b) turning pair
c) screw pair d) spherical pair e) rolling pair
3. Explain lower pair and
higher pairs
4. Explain self closed pair and
force-closed pair
5. Differentiate between
machine and a structure.
6.
Classify different kinematic pairs.
APPLICATION
1.
Explain With a neat sketch completely constrained motion.
2.
Explain with sketch four bar chain and mention its inversions.
3.
Explain with sketch single slider crank chain and mention its inversions.
4.
Explain with sketch double slider crank chain and mention its inversions.
5.
Explain with a neat sketch beam engine
6.
Explain with a neat sketch four bar
chain.
7.
Explain With a neat sketch double crank mechanism.
8.
Explain With a neat sketch single slider crank chain.
9.
Explain with a neat sketch bull engine.
10.
Explain with a neat sketch crank and slotted lever quick return motion
mechanism.
11.
Explain with a neat sketch elliptical
trammel.
12.
Explain with a neat sketch Scotch yoke
mechanism
13.
Explain with a neat sketch Oldham’s coupling.
CO2 : SELECT APPROPRIATE POWER TRANSMISSION MECHANISMS
REMEMBERING
1.
Define the following terms.
2.
List the advantages of flat belt over v-belt drive.
3.
List the Advantages and Disadvantages of Belt over Rope Drive
4. Define the following terms
A)
Pitch circle. B). Addendum. C).Dedendum. D). Circular pitch.
E) Diametral pitch. F) Module.
UNDERSTANDING
1. Explain open
belt and cross belt drives.
2. Explain the
following a) Velocity
ratio b) slip c) creep.
3. Explain slip
and creep of belt drive.
4. Explain centrifugal
tension of flat belt.
5. Discuss the
various types of gear trains.
6. Explain briefly the reverted
gear train
7. Explain briefly the
epicyclic gear train
8. Explain with
neat diagram belt drive with idler pulley.
9. Explain with
neat diagram stepped or cone pulley drive.
10.
Explain with neat diagram fast and loose pulley drive.
11. Explain with
neat diagram compound belt drive and write its velocity ratio.
12. Explain
briefly the compound Gear train with diagram
