Plan Your Semester in a Smarter Way Sem - 5: Mech / AutoHeat Transfer: R. K. Rajput Heat Transfer: Yunus Cengel ... The mass removed at holes 1 and 2 is 100 gm each and the mass removed

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Enquiries: 9820341855 │ Google Playstore - Irfan sir: Mech │ www.irfansir.com │Sem-IV : (Mech / Auto)

Plan Your Semester in a Smarter Way

Sem - 5: Mech / Auto

For Choice Based Credit and Grading System

Subjects Recommended Reference Books

Heat Transfer#

Heat Transfer: R. K. Rajput Heat Transfer: Yunus Cengel Heat Transfer: D. S. Kumar

D. O. M# Theory of Machines: S. S. Rattan Mechanical Vibrations: Graham Kelly

Mechanical Vibrations: V. P. Singh

I. C. Engine# I. C. Engines: V. Ganeshan I. C. Engines: Domkundwar

M. M. C# Mechanical Measurements: A. K. Shawney

Modern Control Engineering: K. Ogata

Department Level Optional Course

(Students has to opt for anyone)

Press Tool Design Production Engineering: P C Sharma Tool Design: C. Donaldson Die Design Fundamentals: J. R. Paquin

Machining Science & Tool Design Cutting Tools: P H Joshi Fundamentals of Metal Cutting: B. L. Juneja Metal Cutting Theory: Arshinov & Alekseev

Design of Jigs & Fixtures Tool Design: C. Donaldson Intro to Jig and Tool Design: MHA Kempster Jigs & Fixtures: P. H. Joshi

# Represents that, batches for these subjects would be taken by us at our Dadar Classroom. Detailed Timetable is uploaded on

our website www.irfansir.com

Sem-5 would be a Heavy Semester, hence it is recommended that, students distribute their Sem - 5 pressure by joining certain subjects in Vacation, certain in Regular, certain in Crash and some of the subjects should be done on their own

Subjects Syllabus on Recent Papers on

Compulsory

They all have Viva / Practical Exam

Heat Transfer Pg - 1 Pg - 15

D. O. M Pg - 3 Pg - 19

I. C. Engine Pg - 5 Pg - 23

M. M. C Pg - 7 Pg - 27

You have to opt for anyone

Press Tool Design Pg - 9 Not Available

Machining Science & Tool Design Pg - 11 Not Available

Design of Jigs & Fixtures Pg - 13 Not Available

Sem-5 Vacations Batches by Irfan sir starts from 19th June’18, 8:45am to 1:15pm at Dadar

1 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

www.irfansir.com | Call: 9820341855 | Playstore: Irfan sir: Mech | WhatsApp: 9820341855 | Email: [email protected]

Heat Transfer Syllabus

2 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

3 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Dynamics of Machinery - D.O.M Syllabus

4 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

5 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


I. C. Engine Syllabus

6 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

7 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


M. M. C. Syllabus

8 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

9 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Press Tool Design Syllabus

Department Level Optional Course - 1

10 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

11 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Machining Sciences & Tool Design Syllabus


12 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

13 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Design of Jigs and Fixtures Syllabus


14 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

15 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Mumbai University Papers - Sem 5

Heat Transfer Nov’17 Exam

16 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

17 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Heat Transfer May’18 Exam

18 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

19 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Model Paper

D.O.M - Revised Syllabus

Note:

DOM being a new subject introduced in the revised syllabus, hence there is no MU question paper for it. To help the student get an idea as to how a DOM paper would approximately look like, we have made a Model Paper for it.

Total Marks: 80

N.B

Question No. 1 is compulsory.

Answer any three out of remaining five questions.

Assume suitable data, if required; but justify the same.

Q 1. Attempt any four [20m]

a) Four holes were drilled in a uniform circular disc at a radius of 100mm and at an angles of 0°, 60°, 120° and 180°. The mass removed at holes 1 and 2 is 100 gm each and the mass removed at holes 3 and 4 is 125 gm each. If the disc is to be balanced statically by drilling a fifth hole at a radius of 125mm, find the mass to be removed and the angular location of this fifth hole.

b) Stating the formulas, sketch the dimensionless amplitude versus frequency ratio curves of a vibration measuring instrument. Explain in what regions, is can be used as an Accelerometer and as a Vibrometer?

c) A single DOF system consists of a mass 20kg and a spring of stiffness 4000 N/m. The amplitude of successive cycle are found to be 50, 45, 40, 35......mm. Determine the nature and magnitude of damping force. Also find the frequency of damped vibration.

d) Draw Displacement v/s Time plots for Overdamped, Critically damped, Underdamped and Undamped cases, all superimposed to a common scale. Also comment on the nature of time period of oscillations for increased values of damping.

e) Prove that the sensitiveness of Proell Governor is more than that of Porter Governor.

Q 2. (a) A Gun Barrel of mass 600kg & recoil spring of stiffness 2.94 x 105 N/m is shown in the figure. [10m]

If the barrel recoils 1.3 m on firing, determine;

i. Initial recoil velocity of the barrel. ii. Damping coefficient of the dashpot that is engaged at the end of recoil stroke.

iii. Time required for the barrel to return 5cm from the initial firing position.

Q 2. (b) The crank and connecting rod of a vertical single cylinder gas engine running at 1800 rpm are 60mm and 240mm respectively. The diameter of the piston is 80mm and the ass of the reciprocating part is 1.2 kg. At a point during power stroke, when the piston has moved 20mm from the T.D.C, the pressure on the piston is 800 kN/m2. Determine; [10m]

i. Net force on the piston.

ii. Net load on the gudgeon pin.

iii. Thrust on cylinder walls.

iv. Speed at which, the gudgeon pin load gets reversed in direction.

20 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Q 3. (a) The arms of Hartnell Governor are of equal length. When the sleeve is in the mid position, the masses rotate in a circle of diameter 150mm (the arms are vertical in the mid position). Neglecting friction, the equilibrium speed for this position is 360rpm. Maximum variation of speed taking friction into account, is to be 6% of the mid position speed for the maximum sleeve movement of 30mm. The sleeve mass is 5kg and the friction at the sleeve is 35N. Assuming the power of the governor to be sufficient to overcome the friction by 1% change in speed on each side of mid position and neglecting the obliquity effects, determine the following;

i. Mass of each rotating ball.

ii. Stiffness of the spring.

iii. Initial compression in the spring.

[10m]

Q 3. (b) The reciprocating mass for the first three cylinders of a four cylinder engine are 4.1, 6.2 and 7.4 tonnes respectively. The centrelines of the three cylinders are 5.2m, 3.2m and 1.2m from the fourth cylinder. If the cranks for all the cylinders are equal then determine the reciprocating mass of the 4th cylinder and angular position of the crank such that the system is completely balanced for the primary forces and couples. If crank radius is 80cm, length of connecting rod is 3.8m and engine speed is 75 rpm then find the maximum unbalanced secondary force and the crank angle at which it occurs. [10m]

Q 4. (a) A water tank column as shown in the figure is 100m high and is made up of reinforced concrete with a

tubular cross section of inner diameter 2.5m and outer diameter 3m. [8m]

.

The tank weighs 270 tonnes when filled with water. By neglecting the mass of the column and assuming the Young’s modulus of reinforced concrete as 2.76 x 1010 N/m2, determine;

i. Natural time period of transverse vibration of the water tank. ii. Vibration response of the water tank due to initial transverse displacement of 25cm.

iii. Maximum values of velocity and acceleration by the water tank.

Q 4. (b) Explain the following terms with reference to governors; [4m]

(i) Sensitiveness (ii) Stability (iii) Isochronism (iv) Coefficient of insensitiveness

... contd on the next page

21 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Q 4. (c) Determine the natural frequency of the system shown in the figure, where; [8m]

I0 = Mas moment of inertia of the rocker arm about the axis of rotation.

Ks = Stiffness of the valve spring.

Kp = Stiffness of the push rod.

ms = mass of the valve spring.

mp = mass of the push rod.

mv = mass of the valve.

Q 5. (a) An accelerometer is constructed by suspending a mass of 0.1 kg from a spring of stiffness 10 x 103 N/m with negligible damping. When mounted on the foundation of the engine, the peal to peak travel of the mass of the accelerometer was found to be 10mm at an engine speed of 1000 rpm. Determine the maximum values of displacement, velocity and acceleration of the foundation. [8m]

Q 5. (b) For the figure shown below, determine the parameters that define the equivalent rotary system using θ as

the generalized coordinates. [6m]

Q 5. (c) Define Dynamically Equivalent Systems. State the conditions necessary to make two systems dynamically

equivalent. Also derive the expression for correction couple. [6m]

22 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Q 6. (a) An automobile is modelled as a single degree of freedom system vibrating in the vertical direction while travelling on a rough road. The vehicle has a mass of 1000 kg. The suspension system has a spring constant of 350 KN/m and a damping ratio of 0.4. If the vehicle speed is 25 Km/hr, then determine displacement amplitude of the vehicle. The road surface varies sinusoidally with an amplitude of 0.04m and a wavelength of 5m. [5m]

Q 6. (b) Define whirling speed. Derive the equation for the critical speed of a light shaft with single disc without

damping. [5m]

Q 6. (c) Each wheel of a four wheeled rear engine automobile has a mass moment of inertia 2.4 kg-m2 and an effective diameter of 660 mm. The rotating parts of the engine have a mass moment of inertia as 1.2 kg-m2. The gear ratio of the engine to the back wheel is 3:1. The engine axis is parallel to the rear axle and the crankshaft rotates in the same sense as that of road wheels. The mass of the vehicle is 2200 kg and the centre of the mass is 550 mm above the road level. The track width of the vehicle is 1.5m. Determine the limiting speed of the vehicle around a curve of 80m radius so that all the four wheels maintain contact with the road surface. [10m]

x-x-x-x

Note:

DOM is the heaviest subject of 5th semester. This subject has been made by combining Mech. Vibration (Sem6, old course) and TOM-II (Sem5, old course).

DOM is a numerical oriented subject. Around 90% of the paper will be numerical based and remaining 10% will be theory and derivation based. Questions will be combination of both.

It is advisable to the students of Revised syllabus; not to keep any chapter as an option. Depending on few chapters only to clear the paper would be too risky in DOM. It may happen that negligible questions would

be asked from those topics.

23 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


I. C. Engine May’18 Exam

24 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

25 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


I. C. Engine Nov’17 Exam

26 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

27 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


M.M.C: Nov’17 Exam

... contd on next page

28 | P a g e

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


x-x-x-x

Documents

Plan Your Semester in a Smarter Way Sem - 5: Mech / AutoHeat Transfer: R. K. Rajput Heat Transfer: Yunus Cengel ... The mass removed at holes 1 and 2 is 100 gm each and the mass removed