Topic wise Paper Solution

Examination: 2016 WINTER
Que.No	Question/Problem	marks
Q 2 a )	Why pressure relief valve is used in hydraulic circuit............	8
Q 2 a )	Differentiate vapour compression and vapour absorption refrigeration system.........	8
Q 2 b )	A single stage reciprocating air compressor has a swept volume of 2000 cm3 and runs at 800 rpm.	8
Q 2 b )	What is machine ? Differentiate between a machine and a structure.	4
Q 2 b )	Explain with the help of neat sketches, the design procedure of a square sunk key	8
Q 2 c )	A four stroke gas engine has a cylinder diameter of 25 cm and stroke 45 cm...	8
Q 2 c )	Explain Klein’s construction to determine velocity and acceleration of different links in single slider crank mechanism.	4
Q 2 c )	Explain the construction and working of doubled acting reciprocating compressor with neat sketch.	8
Q 2c)(i)	State applications of maximum shear stress theory and principal normal stress theory	8
Q 2c)(ii)	State two applications each of cotter joint and knuckle joint.	8
Q 2 d )	Define the terms	4
Q 2 d )	Explain with neat sketch different types of follower.	4
Q 2 f )	A pulley is driven by the flat belt running at speed of......	4
Q 3 a )	List any four pollutants in exhaust gases of I.C. engine with their effects.	4
Q 3 a )	State the composition of the materials 30 Ni 16 Cr5, 40C8, FeE230 X15Cr25Ni 12	4
Q 3 a )	Write any four advantages of oil hydraulic system.	4
Q 3 a )	Discuss the following motion of the follower by drawing the displacement velocity and acceleration diagram.	4
Q 3 b )	Compare closed cycle and open cycle gas turbine.	4
Q 3 b )	Design single cotter joint to transmit 200 kN. Allowable stresses for the material are 75 MPa in tension and 50 MPa in shear.	4
Q 3 b )	Draw symbols of.......	4
Q 3 b )	The crank and connecting rod of steam engine are 0.5m .......	4
Q 3 c )	Define i) Humidity ratio, ii) Specific humidity	4
Q 3 c )	State the ‘Lewis equation’ for spur gear design. State SI unit of each term in the equation.	4
Q 3 c )	Explain the principle of regenerative circuit..................	4
Q 3 c )	Compare cross belt drive and open belt drive on the basis of.......	4
Q 3 d )	Name four sensors used in I.C. engine and explain working of any one.	4
Q 3 d )	Explain why bolts of uniform strength are preferred. Draw sketches of two different types of bolts of uniform strength	4
Q 3 d )	What is FRL unit? Explain its function	4
Q 3 d )	State the applications of (i) Band brake (ii) Disc brake (iii) Internal expanding shoe brake (iv) External shoe brake	4
Q 3 d )	Three masses 10 kg, 20 kg and 15kg are attached at a point ........	4
Q 3 e )	What is scavenging in I.C. engine ? State its types.	4
Q 3 e )	Prove that for a square key sc = 2t where sc = crushing stress t = shear stress.	4
Q 3 e )	Draw pilot operated DA cylinder circuit .............	4
Q 3 f )	Explain with neat sketch working principle of epicyclic gear train.	4
Q 4 a )	Generally, the lower side is kept “Tight side” and upper side is kept as “Slack side” with the belt drives having small driving pulley and big driven pulley. Why ?	4
Q 4a)(a)	Explain the process of combustion in diesel engine.	4
Q 4a)(b)	Explain battery ignition in S.I. engine.	4
Q 4a)(c)	State the norms of Bharat stage III and IV	4
Q 4a)(d)	State different methods for improving thermal efficiency of gas turbine and explain any one.	4
Q 4a)(i)	What is the use of direction control valve...	4
Q 4a)(i)	State four examples of ergonomic considerations in the design of a lathe machine.	4
Q 4a)(ii)	Draw bleed off circuit and label it	4
Q 4a)(ii)	Write the equation with Wahl’s factor, used for design of helical coil spring. State the SI unit of each term in the equation	4
Q 4a)(iii)	What are the limitations of pneumatic system?	4
Q 4a)(iii)	State four important modes of gear failure.	4
Q 4a)(iv)	Draw symbol of.............	4
Q 4a)(iv)	State four disadvantages of screwed joints.	4
Q 4 b )	Describe with neat sketch the working of Oldham’s coupling.	4
Q 4b)(a)	Define – (i) Indicated power, (ii) Mechanical efficiency, (iii) BSFC	6
Q 4b)(b)	List the additives of lubricant used in S.I engine and state their advantages.	6
Q 4b)(i)	Explain the design procedure of shaft on the basis of torsional rigidity. State the equation with SI units. State two applications of this approach.	6
Q 4b)(i)	What is the meaning of unidirectional air motor and bi directional air motor.........	6
Q 4b)(ii)	Draw S-N curve. Explain the concept of endurance limit and its need in design of machine elements	6
Q 4b)(ii)	Compare linear actuators and rotary actuators.	6
Q 4 c )	Distinguish between flywheel and governor.	4
Q 4 d )	Discuss the working of Rope brake dynamometer with the help of a neat sketch.	4
Q 4 e )	Explain the working of internal expanding shoe brake with the help of neat sketch.	4
Q 4 f )	Explain the process of balancing of single rotating mass by a single mass rotating in the same plane.	4
Q 5 a )	A power screw on a machine has single start square thread with a non rotating bronze nut. Axial force on the screw is 15 kN. Allowable stresses for screw material in compression and shear are 85 MPa and 37 MPa respectively. Allowable bearing pressure for	8
Q 5 a )	In a slider crank mechanism the length of crank and connecting rod are 100mm ..........	8
Q 5 a )	Explain with neat sketch construction and working of ice plant.	8
Q 5a)(i)	Draw symbol of any three types of Hydraulic motors.	8
Q 5a)(ii)	What is impulse circuit? Explain	8
Q 5 b )	Design a helical compression spring with ground ends. The spring index is 12. Maximum load on the spring is 100N and deflection under maximum load is 15 mm. Allowable shear stress of the material is 100 MPa and modulus of rigidity is 4 MPa. Find wire and	8
Q 5 b )	Explain construction and working of gear pump.	8
Q 5 b )	Draw profile of cam to raise the valve with S.H.M. through 5cm..........	8
Q 5 b )	A single cylinder reciprocating compressor has a bore of 120 mm and a stroke of 150 mm...	8
Q 5 c )	Explain working of directly operated.........	8
Q 5 c )	In a band and block brake shown in Fig.......	8
Q 5 c )	Explain with neat sketch construction and working of constant volume gas turbine.	8
Q 5c)(i)	(i) State the steps involved in selection of a proper ball bearing from a manufacturer’s catalogue.	8
Q 5c)(ii)	State two engineering applications of each of Acme and Buttress thread profiles with neat sketches.	8
Q 6 a )	What is the necessity of purification of air in compressor and how it is done ?	4
Q 6 a )	In cold climate why oil tank is equipped with oil heaters? Explain.	4
Q 6 a )	Derive strength equation for parallel fillet weld subjected to tensile load.	4
Q 6a)(i)	Define the following terms as applied to cam with neat sketch.	4
Q 6a)(ii)	Differentiate between disc brake and internally expanding brake.	4
Q 6 b )	A diesel engine has a compression ratio of 14 and cut-off takes place at 6% of stroke....	4
Q 6 b )	State two applications of leaf spring. Draw neat sketch of leaf spring	4
Q 6 b )	Compare meter in circuit and meter out circuit	4
Q 6 b )	PQRS is a four bar chain with link PS fixed..........	8
Q 6 c )	Define (i) Dew point temp. (ii) Wet bulb temp	4
Q 6 c )	A steam engine cylinder has effective diameter of 250 mm. It is subjected to maximum steam pressure of 1.5 MPa. The cylinder cover is fixed to the cylinder with the help of 12 bolts. The pitch circle diameter of bolts is 400 mm. Permissible tensile stress	4
Q 6 c )	Draw the hydraulic circuit for shaping machine........	4
Q 6 c )	Determine the power lost in a footstep bearing...........	8
Q 6 d )	Explain the principle of Ram jet with neat sketch	4
Q 6 d )	Differentiate between sliding contact and rolling contact type bearings.	4
Q 6 d )	Draw constructional details of pneumatic hose........	4
Q 6 e )	Draw neat sketch of split air conditioner and name the parts.	4
Q 6 e )	State one application each of (i) Deep groove ball bearing (ii) Taper roller bearing (iii) Thrust roller bearing (iv) Needle roller bearing	4
Q 6 e )	A taper roller bearing has a dynamic load capacity of 26 kN. The desired life for 90% of the bearing is 8000 hr. and speed is 300 rpm. Calculate equivalent radial load that the bearing can carry	4
Q 6 e )	How can the speed control of any actuator be achieved........	4

Examination: 2015 SUMMER
Que.No	Question/Problem	marks
Q 1a)(a)	Write the equations for air standard efficiency of otto cycle.......	4
Q 1a)(a)	Define kinematic link and kinematic chain.	2
Q 1a)(b)	Define : i) Compression ratio...	4
Q 1a)(b)	Enlist the different type of follower motion.	2
Q 1a)(c)	Define angle of lap and slip in belt drive.	2
Q 1a)(c)	Write uses of compressed air.	4
Q 1a)(d)	State four conditions under which the ‘V’ belt drive is selected.	2
Q 1a)(d)	Draw a neat sketch of vane compressor and label the different parts...........	4
Q 1a)(e)	State the function of Governor in an I.C. engine.	2
Q 1a)(f)	State four applications of flywheel.	2
Q 1a)(g)	Give the classification of dynamometer. State the function of it.	2
Q 1a)(h)	Why is balancing of rotating parts necessary for high speed engines ?	2
Q 1b)(a)	Define completely constrained motion and successfully constrained motion with neat sketch. State one example of each.	4
Q 1b)(a)	What is the necessity of I.C. Engine Testing	6
Q 1b)(b)	Explain working principle of clutch. State its location in transmission system of an automobile.	4
Q 1b)(b)	Explain the procedure for conducting Morse test............	6
Q 1b)(c)	Compare cross belt drive and open belt drive on the basis of .........	4
Q 2 a )	An I.C. Engine uses 6 kg of fuel having calorific value 44000 kJ/kg in one hour.....	8
Q 2 a )	Differentiate machine and structure on any four points.	4
Q 2 b )	What is the necessity of multistage compression.......	8
Q 2 b )	Explain with neat sketch working principle of Oldham’s coupling.	4
Q 2 c )	Explain vapour compression refrigeration........	8
Q 2 c )	Define linear velocity, angular velocity, absolute velocity and state the relation between linear velocity and angular velocity.	4
Q 2 d )	Describe stepwise procedure for determination of velocity and acceleration by Klein’s construction with suitable data.	4
Q 2 e )	Draw a neat sketch of radial cam with roller follower and show the following on it.........	4
Q 2 f )	The central distance between two shaft is 4 m having two pulleys..........	4
Q 3 a )	Draw actual valve timing diagram for 4-stroke petrol engine.	4
Q 3 a )	Draw a neat labelled sketch of “Multiplate Clutch”.	4
Q 3 b )	Explain turb charging with a neat sketch........	4
Q 3 b )	Why roller follower is preferred over a knife follower ? State two advantages and application of roller follower.	4
Q 3 c )	Explain three way catalytic convertor...........	4
Q 3 c )	Write the procedure for balancing of a single rotating mass by single masses rotating in the same plane.	4
Q 3 d )	Explain with a neat sketch turbo propeller w.r.to Jet propulsion	4
Q 3 d )	State the type of power transmission chains. Describe any one with its sketch.	4
Q 3 e )	Explain the concept of super heating and sub cooling with the help of P-h and T-s charts	4
Q 3 e )	PQRS is a four bar chain with PS fixed length of links are PQ = 62.5 mm, ........	4
Q 3 f )	Crank OA of a mechanism is hinged at ‘O’ and rotates at an angular velocity of 20 rad/sec.......	4
Q 4 a )	What are the causes of detonation in I.C. engine ?	4
Q 4 a )	Explain the phenomenon of slip and creep in a belt drive. State its effect on velocity ratio.	4
Q 4 b )	What are the effects of pollutants on environment ?	4
Q 4 b )	Explain with the diagram working of crank and slotted lever quick return mechanism.	4
Q 4b)(a)	Explain with neat sketch turning moment diagram for a four-stroke engine.	6
Q 4b)(b)	The following results were obtained during Morse test on 4-stroke petrol engine. B.P.......	6
Q 4 c )	What are the methods to improve thermal efficiency of gas turbine ? Explain any one method.	4
Q 4 c )	Explain with sketch working of hartnell governor.	4
Q 4 d )	What is jet propulsion ? Give the classification of jet propulsion system.	4
Q 4 d )	Explain working of hydraulic brake dynamometer with sketch.	4
Q 4 e )	Three masses 10 kg, 20 kg and 15 kg are attached at a point at radii of 20 cm.........	4
Q 4 f )	A thrust shaft of a ship has 6 collar of 600 mm ...................	4
Q 5 a )	In reciprocating engine the crank is 250 mm long and connecting rod is 1000 mm long. ..........	8
Q 5 a )	Differentiate between reciprocating and rotary compressors	8
Q 5 b )	Construct a cam profile with knife edge follower having an offset of 10 mm........	8
Q 5 b )	Explain intercooling and reheating in gas............	8
Q 5 c )	Draw a neat sketch of vapour compression refrigeration cycle. Describe its working	8
Q 5 c )	A belt is required to transmit 10 kW from a motor running at 600 rpm.........	8
Q 6 a )	What is MPFI ? Explain any one MPFI system with neat sketch	4
Q 6 a )	State the strength equations of double parallel...................	8
Q 6a)(i)	Define ‘Gear Train’. State its purpose and types of gear train.	4
Q 6a)(ii)	Explain the concept of fluctuation of energy related with turning moment diagram with sketch.	4
Q 6 b )	A simple band brake is operated by lever 40 cm long.......	8
Q 6 c )	Explain the working principle of jet propulsion with a neat sketch.	4
Q 6 c )	An engine of a car has a single plate clutch developed maximum torque 147 N-m.......	8
Q 6 d )	Difference Heat Pump Refrigerator	4
Q 6 e )	Explain the working of window air conditioner with neat sketch.	4

Examination: 2015 WINTER
Que.No	Question/Problem	marks
Q 1a)(a)	An engine of diameter 250 mm and 375 mm stroke works on otto cycle...........	4
Q 1a)(b)	State any four industrial uses of compressed air.	4
Q 1a)(c)	Define the following terms related to compressor....	4
Q 1a)(d)	What is pre-ignition ? State any two factors responsible for pre-ignition.	4
Q 1a)(i)	Define - 1. Mechanism 2.Inversion	2
Q 1a)(ii)	State any two types of motion of the follower.	2
Q 1a)(ii)	Differentiate between Knuckle joint and Cotter joint................	4
Q 1a)(iii)	Define slip and creep in the belt.	2
Q 1a)(iii)	Write Lewis equation for strength of gear tooth. State the meaning of each term	4
Q 1a)(iv)	State any two advantages of V belt drive over flat belt drive.	2
Q 1a)(iv)	State four different thread profiles used in power transmission. Draw neat sketches of any two of them.	4
Q 1a)(l)	What are the steps involved in general design procedure? Explain.	4
Q 1a)(l)	What is stress concentration? Explain any four methods to reduce it.	6
Q 1a)(v)	State the function of flywheel in IC engine.	2
Q 1a)(vi)	Define stability and hunting of governor.	2
Q 1a)(vii)	Compare brakes and dynamometers (two points).	2
Q 1a)(viii)	State any two adverse effects of imbalance.	2
Q 1b)(a)	A petrol engine working on otto cycle has compression ratio 8 ....	6
Q 1b)(b)	Write any three pollutants in exhaust gasses....	6
Q 1b)(i)	Draw neat labeled sketch of crank and slotted lever mechanism. Label all parts.	2
Q 1b)(ii)	A shaft 1000 mm long is supported between two bearings. A pulley of 250 mm ...........	6
Q 1b)(ii)	What is the necessity of clutch? State its types.	2
Q 1b)(iii)	Draw the neat sketch of epicyclic gear train and explain how it works.	4
Q 2 a )	Compare Reciprocating air compressor and Rotary air...	8
Q 2 a )	Explain the design procedure of handlever with neat sketch.	8
Q 2 a )	State and explain various types of constrained motions with suitable examples.	4
Q 2 b )	Draw the neat labeled sketch of Oldham’s coupling. State its applications.	4
Q 2 b )	Explain sensible heating and cooling with..	8
Q 2 b )	Explain the design procedure of bush pin type flexible coupling with neat sketch	8
Q 2 c )	Define the terms linear velocity, relative velocity, angular velocity and angular acceleration.	4
Q 2 c )	The following observations were made during the test on an oil engine BP	8
Q 2c)(i)	Explain with neat sketch the stress-strain diagram for ductile material.	8
Q 2c)(ii)	Design ‘‘C’’ clamp frame for a total clamping force of 20 kN............	8
Q 2 d )	For a single slider crank mechanism , state the formulae to calculate by analytical method – Also state the meaning of each term.	4
Q 2 e )	Define the following terms related to cams.	4
Q 2 f )	Numerical Problem-A casting weighing 9 kN hangs freely from a rope which makes 2.5 turns ............	4
Q 3 a )	State the composition of following materials................	4
Q 3 a )	Space diagram 01 Mark, Velocity Diagram 02 marks , Calculations 01 Mark	4
Q 3 a )	What is catalytic convertor ? Explain two way catalytic convertor with neat sketch	4
Q 3a)(d)	Describe the method to measure indicated power of I.C. engine.	4
Q 3 b )	Draw constant pressure closed cycle gas turbine on P.V and T-S planes.	4
Q 3 b )	Design an offset link for a load of 1000 N. Maximum permissible stress in tension for link material is 60 N/mm2. Assume b = 3t for rectangular cross section of the link.	4
Q 3 b )	A Single slider crank mechanism:	4
Q 3 c )	Prove that for square key equally strong in shear and crushing, ....................	4

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Topic wise Paper Solution

Why pressure relief valve is used in hydraulic circuit............

8

Differentiate vapour compression and vapour absorption refrigeration system.........

8

A single stage reciprocating air compressor has a swept volume of 2000 cm3 and runs at 800 rpm.

8

What is machine ? Differentiate between a machine and a structure.

4

Explain with the help of neat sketches, the design procedure of a square sunk key

8

A four stroke gas engine has a cylinder diameter of 25 cm and stroke 45 cm...

8

Explain Klein’s construction to determine velocity and acceleration of different links in single slider crank mechanism.

4

Explain the construction and working of doubled acting reciprocating compressor with neat sketch.

8

State applications of maximum shear stress theory and principal normal stress theory

8

State two applications each of cotter joint and knuckle joint.

8

Define the terms

4

Explain with neat sketch different types of follower.

4

A pulley is driven by the flat belt running at speed of......

4

List any four pollutants in exhaust gases of I.C. engine with their effects.

4

State the composition of the materials 30 Ni 16 Cr5, 40C8, FeE230 X15Cr25Ni 12

4

Write any four advantages of oil hydraulic system.

4

Discuss the following motion of the follower by drawing the displacement velocity and acceleration diagram.

4

Compare closed cycle and open cycle gas turbine.

4

Design single cotter joint to transmit 200 kN. Allowable stresses for the material are 75 MPa in tension and 50 MPa in shear.

4

Draw symbols of.......

4

The crank and connecting rod of steam engine are 0.5m .......

4

Define i) Humidity ratio, ii) Specific humidity

4

State the ‘Lewis equation’ for spur gear design. State SI unit of each term in the equation.

4

Explain the principle of regenerative circuit..................

4

Compare cross belt drive and open belt drive on the basis of.......

4

Name four sensors used in I.C. engine and explain working of any one.

4

Explain why bolts of uniform strength are preferred. Draw sketches of two different types of bolts of uniform strength

4

What is FRL unit? Explain its function

4

State the applications of (i) Band brake (ii) Disc brake (iii) Internal expanding shoe brake (iv) External shoe brake

4

Three masses 10 kg, 20 kg and 15kg are attached at a point ........

4

What is scavenging in I.C. engine ? State its types.

4

Prove that for a square key sc = 2t where sc = crushing stress t = shear stress.

4

Draw pilot operated DA cylinder circuit .............

4

Explain with neat sketch working principle of epicyclic gear train.

4

Generally, the lower side is kept “Tight side” and upper side is kept as “Slack side” with the belt drives having small driving pulley and big driven pulley. Why ?

4

Explain the process of combustion in diesel engine.

4

Explain battery ignition in S.I. engine.

4

State the norms of Bharat stage III and IV

4

State different methods for improving thermal efficiency of gas turbine and explain any one.

4