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Wednesday, November 2, 2016




Roll No.
Total No. of Questions : 09]

B.Tech. (AE/ME/IE(2008 Batch)) (Sem.–4)
THEORY OF MACHINES-II
Subject Code : ME-204
Paper ID : [A0809]

Time : 3 Hrs.
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying
TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and
students has to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and
students has to attempt any TWO questions.

SECTION-A

l. Write briefly :
i) Write the concept of free body diagram.
ii) Describe the disadvantage of unbalance masses of any system.
iii) Write the various sources of forces in mechanism.
iv) Write the conditions of complete balancing of reciprocating parts of
an engine.
v) Differentiate between module pitch and diametral pitch of a gear.
vi) State the conditions of correct gearing.
vii) Draw the diagrams of compound and reverted gear trains.
viii) Explain the concept of gyroscopic motion.
ix) Explain the word synthesis in reference to mechanism.
x) Differentiate among rack, pinion and gear.


SECTION-B

2. Describe the graphical method for determining the inertia forces in a
    horizontal reciprocating engine.
3. Describe the balancing of several unbalance masses revolving in the same
plane by graphical and analytical methods with suitable example.
4. Define pressure angle with the help of a neat sketch and write its
importance in gears. What is the effect of pressure angle on arc of recess
and arc of approach of two mating gears?
5. A uniform disc of 100mm diameter and 5 kg is mounted midway between
bearings which are 200 mm apart and keep it in a horizontal plane. The
disc spins about its axis with a constant speed of 1200 rpm counter
clockwise when viewed right hand side bearing. If the disc process
about the vertical axis by 50 rpm anticlockwise looking from top, then
find the resultant reactions at each bearing due to the mass and gyroscopic
effects.
6. Two spiral gears in mesh have the following data
Angle of friction                      6°
Normal pitch                           20 mm
Shaft angle                              55°
Speed ratio                              3
Approx. center distance          400 mm
Spiral angle of pinion              25°
Determine (a) exact center distance (b) number of teeth in each wheel
(c) efficiency of the drive.

SECTION-C

7. State how epicyclical gear train is different from other gear trains? With the
help of suitable example, describe the method to analyze epicyclical gear
train.
8. The following data refer to two cylinder locomotive with crank at 90°
Reciprocating mass per cylinder                          300 kg
Crank radius                                                           0.30 m
Driving wheel diameter                                            1.80 m
Distance between cylinder center lines                     0.65 m
Distance between the driving wheels central plane  1.55m
Determine (a) the fraction of the reciprocating masses to be balance, if
the hammer blow is not to exceed 46×103  at 96.5 km/hr (b) the variation in attractive effort (c) the maximum swaying couple.
9. A four bar mechanism is required such that the input and output angles
are coordinated as given in the table:
         
Input crank angle
30°
50°
80

Output follower angle
30°
60



Synthesize the mechanism

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