### FORMAT OF I A TEST QUESTION PAPER (CIE) | MODEL QUESTION BANK | MODEL QUESTION PAPER

 Test/Date and Time Semester/year Course/Course Code Max Marks Ex: I test/6 th weak of sem 10-11 Am I/II SEM 20 Year: Name of Course coordinator :                                                                                             Units:   CO’s: Question no Question MARKS CL CO PO 1 2 3 4

 MODEL QUESTION PAPER (CIE)

Note: Internal choice may be given in each CO at the same cognitive level (CL).

 Test/Date and Time Semester/year Course/Course Code Max Marks Ex: I test/6 th weak of sem 10-11 Am IVSEM MECHANICS OF MACHINES 15ME32T 20 Year: 2016-17 Course code:15ME41T Name of Course coordinator :                                                                                             Units:1,2 Co: 1,2 Note:  Answer all questions Question no Question MARKS CL CO PO 1 Explain lower pair and higher pairs 05 U 1 1,2,3,4, 5,6,10 2 List the different types of constraint motion Explain any one. 05 R 1 1,2,3,4, 5,6,10 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

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.

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