USN MEE51

New Horizon College of Engineering, BangaloreAutonomous College affiliated to VTU, Accredited by NAAC with .A' Grade& llBA

Makeup Examinatian Jan 2020

MACHII{E THEORY & MECHANISM DESIGNDuration: 3 hrs Max. Marks: 100

question from each module.Answer five full questions choosing one complete

Module II a) Write the classification of Kinematic pairs based on different criteria. Also explain the 10

working of any straight line motion mechanism.

b) Compute the mobility of the following mechanisms by Gruebler's criterion. Also, 10

illustrate Grashoff s law.C D3

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2 a\ With neat sketches, Describe i) Whitworth's quick return motion mechanism. ii) 10

Oldham's Coupling.b) Derive the expression for Condition for Correct steering in a 4 wheeler travelling in a 10

curved path. Also explain Ackermann's Steering Mechanism.Module 2

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3 a) Describe in detail, the Algebraic position analysis of a slider crank mechanism.

b) With neat sketch, Establish the Freudenstein's equation for a 4 bar mechanism.

OR4 a) In a slider uank mechanism, the crank length is 50mm and Connecting rod is of 10

200mm length. The crank is rotating at a uniform speed of 3000rpm in clockwisedirection. Determine the velocity and acceleration of the piston and angularacceleration of the connecting rod when the crank is 30o inclined to the horizontal.

b) Explain in detail, the velocity and acceleration analysis of a 4 bar mechanism using r0

Complex Algebra.Module 3

5 a) A shaft carries 4 masses A,B,C and D of magnitude 200kg, 300kg, 400kg and 200kg t4respectively and revolving at radii 80mm, 70mm, 60mm, and 80mm in planesmeasured from A at 300mm, 400mm and 700mm.The angles between the cranksmeasured anticlockwise are A to B 450, B to C 700 and C to D 1200. The balancingmasses are to be placed in planes X and Y. The distance between planes A and X is100mm, X and Y is 400mm and between Y and D is 200mm. If the balancing masses' revolve at a radius of l00mm, find their magnitude and angular positions.

b) Why balancing of forces required in rotating parts of machine. Describe briefly static 06

and dynamic balancing.

OR

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A shaft running in bearings carries masses 20,3A and 40kg in planes A, B and C with 20

C.G from the axis of the shaft 30mm,20mm and 15mm respectively. The distances ofB and C from A re l000mm and 2000mm to the right of A. The relative angular

positions of the CG of the unbalanced masses are such that they are in static balance.

Determine these.

To obtain complete dynamic balance, suitable masses are introduced in planes D and E

with CG 100mm from the axis. D is 500mm to the left of A and E 500mm to the rightof C. Estimate the position and magnitude of the balancing masses.

Module 4

What is meant sensitivity and hunting of the governor . Find the expressions for the 10

speed ofthe porter governor.

In an engine governor of the porter type, the upper and lower arrns are 200mm and 10

250mm respectively and pivoted on the axis of rotation. The mass of the central load is

15kg, the mass of each ball is 2kg and friction of the sleeve together with the resistance

of the operating gear is equal to a load of 24N at the sleeve. If the limiting inclinationsof the upper arms to the vertical are 30o and 40o, find, taking friction into account,

range ofspeed ofthe governorOR

Derive the expression to find the stiffness of Hartnell governor 10

A hartnell govemor having central sleeve spring and two right-angled bell crank levers 10

moves between 290 rym and 310 rpm for a sleeve lift of l5mm. The sleeve arms and

the ball arrns are 80mm 120mm respectively. The levers are pivoted at 120mm fromthe governor axis and mass of each ball is 2.5 kg. The ball arrns are parallel to thegovernor axis at the lowest equilibrium speed. Determine (i) Loads on the spring at the

lowest and highest equilibrium speeds, and (ii) stiffness of the spring.Module 5

An aero plane makes a complete half circle of 50 meters radius, towards left, when 10

flying at200 km per hr. The rotary engine and the propeller of the plane has a mass of400 kg and a radius of gyration of 0.3 m. The engine rotates at2400 rpm. Clockwisewhen viewed from the rear. Find the gyroscopic couple on the aircraft and state itseffect on it.

Identify the effect of gyroscope couple on naval ship with usual notations. l0

OR

Derive an expression for the effect of gyroscopic couple on the four wheels of the l0

vehicle negotiating a curve.

Each wheel of a motor cycle is of 600mm dia and has a moment of inertia of l.2kgm2. l0

The total mass of the motorcycle and the rider is 180 kg and the combined centre ofmass is 580 mm above the ground level when the motor cycle is upright. The momentof inertia of the rotating parts of the engine is 0.2 kgm2. The engine speed is 5 timesthe speed of the wheels and it is in the same sense. Identify the angel of heel necessary

when the motor cycle takes a turn of 35 m radius at a speed of 54kmph.

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USN MEE54

New Horizon College of Engineering, BangaloreAutonomous College affiliated to VTU, Accredited by NAAC with 'A' Grade& NBA

Makeup Examination Jan 2020

DESIGN OF MACHINE ELEMENTS - 1

Duration:3 hrs Max' Marks: 100

Note: Use of Design Data hand book is Permiued

Answer five full questions choosing one complete question from each module.

Module I

1 a) A point in a structural member subjected to plane stress is shown in figure.

Determine i) Normal and tangential stress intensities on plane EF inclined at an

angle of 300 , ii) Principal stresses and their direction, iii) Maximum shear stress

and the direction of the planes on which it occurs.

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b) A circular rod of diameter 50mm is subjected to loads as shou'n in figure

Determine the nature and magnitude of stresses at the critical point.

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Derive an expression for instantaneous stress due axial impact.

A plate of C45 steel (oy6 :353MPa) is subjected to the following stress o, =750MPa, oy = 700MPa,and t :50MPa, Find the factor of safety by (i)

Maximum principle stress theory (ii) Maximum shear stress theory (iii) Hencky

Mises theory.Module 2

List the factors that affect the endurance limit of the material and explain two ofit in detail.

Determine the maximum stress in the following cases taking stress concentration

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i) A rectangular plate of 50mm x 80mm with a hole of l0mmdiameter in the

centre is loaded axial tension of 10kN. Thickness of the plate is 10mm.

ii) A circular shaft of 45mm diameter stepped down to 30mm diameter having afillet radius of 6mm subjected to a twisted moment of l50Nm.

ORExplain the methods of reducing stress concentration with relevant sketches.

A cantilever beam ofcircular cross section is subjected to an alternating bending

stress at a point on the outer fiber in the plane of the support that varies from21MPa( compression) to 28 MPa (tension). At the same time there is an

alternating stress due to axial loading that varies from 14 MPa( compression) to28MPa ( tension). The material has an ultimate strength of 412 MPa, yieldstrength of 309MPa. Assume that the actual stress concentration factorl, size

correction factorO.85 and surface correction factor :0.9. determine l)equivalent normal stress due to axial loading

2) equivalent normal stress due to bending

3) total equivalent normal stress due to axial loading and bending

Module 3

The structural connection as shown in figure is subjected to an eccentric load Pof 10kN with an eccentricity of 500mm. the centre distance between bolts at 1

and 3 is 150mm and the centre distance between bolts at I and2 is 200mmm. Allbolts are identical and are made of plain carbon steel having yield strength intension of 400MPa and the FOS is 2.5. determine size of bolts.

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b) Ml0 steel bolt of l25long subjected to impact load. The kinetic energy absorbed

by the bolt is 2.5Joule, determine (i) Stress in the shank of the bolt if there is no

threaded postion between nut and bolt head (ii) stress in the shank if the entirelength of the bolt is threaded.

OR6 a) A 16mm thick plate is welded to vertical support by two fillet wels as shown in

figure. Determinethe size of weld if the permissible shear stress for the weldmaterial is 75MPa.

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b) Determine the safe value of P for a joint loaded as shown in fig. limiting the l0 L5 CO2,6maximum normal stress induced to 80 MPa and maximum shear stressinduced to 60 MPa.

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Module 47a) Design a socket and spigot type cotter joint to sustain an axial load of 100 10

kN.The material selected for the joint has the following design stresses. o 1 :100

MPa; o":150 MPa and t:60 MPa.

b) Design a knuckle joint to connect two mild steel rods subjected to an axial pull of l0100 kN.The allowable stresses for rods and pin are 100MPa, 130MPa and

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60MPa in tension, crushing and shear respectively. The bending of the pin is

prevented by selection ofproper fit.

OR

8 a) Derive an equation for torque required to raise the load on a square threaded

screw and also explain self locking and overhauling in power scre\\is.

b) A square threaded power screw has a nominal diameter of 30 mm and a pitch of

6mm with double threads. The load on the screw is 6 kN and the mean diameter

of the thrust collar is 40 mm. The coefficient of friction for the screw is 0.1 and

the collar is 0.09.Determine.

(i) Torque required to raise the screw against load'

(ii) Torque required to lower the screw with the load'

(iii) Overall efficiencY.

(iv) ls this screw self -locking?

Module 5

9 a) A pair of carefully cut spur gears with 200 full depth involute profile is used to

transmit 12 kW at 1200 rprn of pinion. The gear has to rotate at 300 rpm.The

material used for both pinion and gear is medium carbon steel whose allowable

bending stress may be taken as 230 MPa.Detennine the rnodule and face width

of the spur pinion and gear. Suggest suitable hardness. Take 24 teeth on

pinion.Modulus of elasticity may be taken as 21OGPa'

OR

Design a pair of helical gears to transmit power of 15 kW at 3200 rpm with

speed reduction 4:1.Pinion is made of cast steel 0.4% C untreated. Gear is made

1 0a) of high grade CI. Helix angle is limited to 260 and not less than 20 teeth are to be

used on either gear. Suggest suitable surface hardness for the gear pair.

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New Horizon College of Engineering, BangaloreAutonomous College affiIiated to VTU, Accredited by NAAC with'A'Grade& NBA

Makeup Examinatio n J an 2020PROJECT MANAGEMENT &ENTREPRENEURSHIP

Duration:3 hrs Max. Marks: 100Answer five full questions choosing one complete question from each module.

Module 1

I a) Describe the roles and responsibilities of project manager. 10 Llb) Illustrate the various phases of project life cycle management. 10 L2

OR2 a) Explain various tools and techniques used in project management. 10 Llb) Discuss the impact of delays in projects. 10 Lz

Module 23 a) Examine the various communication methods used in projects. 10 L3b) Describe the role of stake holders for projects. 10 L4

OR4 a) Describe briefly various steps to be followed in construction of work breakdown structure (UIBS). 10 L3b) Explain the various methods to evaluate project profitability. l0 L4

Module 35 a) Draw purchase cycle diagram and explain different processes of it. 10 L4b) Describe briefly about GANTT charts with a neat sketch. l0 L5

OR6 a) Illustrate the role of Management Information System in project control (MIS). 10 L4b) The table lists the obs of a network with their estimates 10 L5

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i) Draw the project networkii) Calculate the length and variance of critical projectiii) What is the approximate probability that the jobs on the criticalpath will be completed in 4ldays

Module rlIllustrate the balanced score card approach with an example.What make up activities are required during the course of project closure.

ORExplain the role of entrepreneurs in economic development of a country.lllustrate the various barriers of entrepreneurship.

Module 5

Define the small scale industry and state the characteristics of SSI.Explain the steps to start an SSI.

ORWrite a short note on GATT. Also explain the functions of WTO.Explain the impact of liberalization and privatization on small scale industry.

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New Horizon College of Engineering, BangaloreAutonomous College afliliated to VTU, Accredited by NAAC with'A' Grade& NBA

Makeup Examinati on J an 2020

MECHATRONICS & MICROPROffi SSORSDuration:3 hrs Max. Marks: 100

Answer five full questions choosing one complete question from each module.Module I

1 a) Make use of microprocessor base control system; illustrate with neat sketch how automatic washing l0 L2machine is working.

b) Explain the working of a microprocessor controlled automatic camera with neat block diagram. 10 L2OR

2a) Illustrate with block diagram; show how automatic room AC is working as closed loop control system. 10 L2b) What is hall effect? Explain with neat sketch the principle of hall effect sensor in automobile fuel tank. l0 L2

Module 23 a) Explain the basic properties of ideal op-amp (operational amplifier). 6 L2b) Define signal conditioning, explain need for signal conditioning. 7 L2c) Construct a wheat stone bridge to show that change in output is proportional to change in resistance. 7 L4

OR4 a) Explain inverting and non-inverting amplifier with neat circuit. 6 Lzb) Define filters and list out the different types of filters. 7 L2c) Construct sumrning amplifier circuit and derive the expression for voltage gain. 7 L4

Module 35 a) With block diagram explain elecfonic stability control. 6 L2b) Explain telematics with neat block diagram. 7 L2c) Illustrate with block diagram show how cruise control is working and explain its components. 7 L2

OR6 a) With block diagram explain antilock braking system and its components. 6 L2b) Explain supplemental restraint system (SRS) with neat sketch. 7 L2c) Explain traction control system with neat layout. 7 L2

7a)Module 4

Illustrate with neat block diagram; show how mechatronics is used inDeicing temperature controlsystem.

With a neat block diagram, show how mechatronics product car park barriersare working.OR

Illustrate with neat block diagram; show how mechatronics is used in control of thermal cyclefatigue of a ceramic plate.

With a neat block diagram, design of mechatronics product of pick and place robot.Module 5

Illustrate with neat block diagram; explain pin configuration of 8085 microprocessor.Explain with block diagram the flow of instructions word and flow of data word in amicroprocessor.

ORIllustrate with neat block diagram; explain various registers of 8085 microprocessor.Explain different types of addressing modes of 8085 microprocessor

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