You are here

Topic wise Paper Solution

Examination:
Que.No Question/Problem marks
Q )

State one application of each : v-belt drive, flat belt drive, chain drive and gear drive.

4

Q 3 a )

State the norms of Bharat stage III and IV.

4

Q 4a)(iii)

State the effect of keyway on the strength of the shaft.............

4

Q 5 c )

Draw psychrometric chart with all the property lines and represent following psychrometric.....

8

Q 6 b )

Define.............

4

Examination: 2017 SUMMER
Que.No Question/Problem marks
Q 1 a )

Define inversion with example.

2

Q 1a)(a)

Enlist uses of compressed air (any four).

4

Q 1a)(a)

What is function of (i) oil reservoir (ii) pressure relief valve, (iii) direction control valve, (iv) filters ?

4

Q 1a)(b)

What are the advantages of multistaging ?

4

Q 1a)(b)

Draw and explain working of pressure reducing valve.........

4

Q 1a)(c)

Classify gas turbines

4

Q 1a)(c)

Explain piston pump with neat sketch.............

4

Q 1a)(d)

Define : i) Tonnage of refrigeration........

4

Q 1a)(d)

What is an accumulator ? Why accumulator is necessary for huge hydraulic pressers ?

4

Q 1a)(ii)

Cotter Joint

8

Q 1a)(iii)

A hollow shaft for a rotary compressor is to be designed to transmit maximum torque of 4750 N-m. The shear stress in the shaft is limited to 50 MPa. Determine the inside outside diameter of the shaft if the ratio of inside to outside diameter of the shaft

8

Q 1 b )

List the inversions for double slider crank mechanism.​

2

Q 1b)(a)

Write the causes and remedies for the following..............

6

Q 1b)(a)

Give classification of IC engines (any six)..........

6

Q 1b)(b)

What is pressure compensated flow control valve ? Explain with sketch............

6

Q 1b)(b)

Morse Test

6

Q 1b)(i)

What are the factors to be considered for selection of materials for design of machine elements?

6

Q 1b)(ii)

Design a bushed pin type flexible coupling for connecting a motor shaft to a pump shaft for the following service conditions. Power to be transmitted = 40 KW. Speed of the motor shaft = 1000 RPM. Diameter of the motor shaft = 50 mm Diameter of the pump sh

6

Q 1 c )

Define sliding pair with example.

2

Q 1 d )

Define centripetal and tangential acceleration.

2

Q 1 e )

Find the velocity of point B and midpoint C of link AB shown in Figure

2

Q 1 f )

Classify the cam

2

Q 1 g )

Define following terms with respect to cam and follower

2

Q 1 h )

What are the limitations of knife edge follower ?

2

Q 1 i )

Define self-energizing and self-locking brake.

2

Q 1 i )

Write down the formula of length of belt for open belt drive and cross belt drive.

2

Q 1 i )

List the methods to reduce the slip in belt and pulley.

2

Q 1 k )

Define law of gearing.

2

Q 1 l )

What is factor of safety? State its importance in design of machine elements.

8

Q 1 m )

What are the limitations of shoe brake ?

2

Q 1 n )

Define uniform wear theory and uniform pressure theory.

2

Q 1 o )

State effects of imbalance in machine.

2

Q 2 a )

Compare meter-in-circuit with meter-out-circuit.............

8

Q 2 a )

Design a knuckle joint to transmit 150 KN. The design stresses may be taken as 75 MPa in tension, 60 MPa in shear and 150 MPa in compression.

8

Q 2 a )

Draw a neat sketch and explain working of beam engine.

4

Q 2 a )

In an Ideal ottocycle the air at the beginning of isentropic compression is at 1.01325 bar and......

8

Q 2 b )

Explain vapour compression refrigeration cycle on T-S and p-h charts..

8

Q 2 b )

Explain with neat sketch how to find the velocity of a slider in slider crank mechanism by Klein’s construction.

2

Q 2 b )

The following data refers to a trial conducted on 4-stroke petrol engine Air-fuel ratio (by mass)......

8

Q 2b)(ii)

Draw neat sketch of a protected type flanged coupling showing all details.

8

Q 2b)(l)

State and explain two most important reasons for adopting involute curves for a gear tooth profile

8

Q 2 c )

What is function of filters ? Classify the filters and draw any two types of filter.......................

8

Q 2 c )

Draw and explain in short, types of followers used in cam and follower.

4

Q 2 c )

Differentiate between reciprocating air compressor and rotary air compressor.

8

Q 2c)(i)

Why are bushes of softer material inserted in the eyes of levers?

8

Q 2c)(ii)

Explain the following types of stresses a) Transverse shear stress b) Compressive stress c) Torsional shear stress

8

Q 2 d )

Explain condition for maximum power transmission.

4

Q 2 e )

Explain the compound gear train with neat sketch and write down the velocity ratio’s equation.

4

Q 2 f )

A multiplate clutch has three pairs of contact surfaces. The outer and inner radii .......

4

Q 3 )

Represent Brayton cycle on PV and TS diagram.......

4

Q 3 a )

Explain 4-way-3 position direction control valve used in hydraulic system..........

4

Q 3 a )

Differentiate between mechanism and machine.

4

Q 3 b )

Explain gear pump with neat sketch.........

4

Q 3 b )

Explain the working of Whitworth quick return mechanism.

4

Q 3 b )

Design a foot brake lever from the following data: Length of lever from C.G. of the spindle to the point of application of the load = 1 meter. Max. load on the foot plate = 800 N Overhang from the nearest bearing = 100 mm Permissible tensile and shear str

4

Q 3 b )

A petrol engine has a cylinder of diameter 60 mm and stroke 100 mm.......

4

Q 3 c )

Explain any four criteria for selection of hydraulic pump in hydraulic system.

4

Q 3 c )

In slider crank mechanism, the length of crank OB and...............

4

Q 3 c )

Explain with neat sketch two way catalytic converter.

4

Q 3 d )

Differentiate between closed cycle and open cycle gas turbine

4

Q 3 d )

Find the width of the belt, necessary to transmit 7.5 kW.............

4

Q 3 d )

Name any four components of pneumatic system......................

4

Q 3 d )

Compare welded joints with screwed joints. (Any six points)

4

Q 3 e )

Explain the effect of superheating and subcooling on the performance of vapour compression cycle......

4

Q 3 e )

Explain the working of Watt governor with neat diagram.

4

Q 3 e )

Draw labelled sketch of air lubricator..............

4

Q 3 e )

A shaft 30 mm. diameter is transmitting power.....................

4

Q 3 f )

Centrifugal Clutch

4

Q 4 a )

Explain the working of freewheel mechanism of bicycle with sketch.

4

Q 4a)(a)

a) Define : i) Stroke ii) Bore

6

Q 4a)(a)

What are actuators ? Draw a double acting cylinder.

4

Q 4a)(b)

Explain with sketch working of screw compressor.

4

Q 4a)(b)

Explain pressure relief valve in pneumatic system.

4

Q 4a)(c)

Classify gas turbines on the following basis.....

4

Q 4a)(c)

Explain with sketch, a pneumatic circuit for speed control of bidirectional motor.

4

Q 4a)(d)

Name the refrigerants used for..

4

Q 4a)(d)

State any two applications of 3 × 2 DC valve. Draw symbol for the same.

4

Q 4a)(i)

(i) Give the composition of : 1) 35Mn 2 Mo28 2) 30Ni 4 Crl and 3) 25 Cr 3 Mo 55

4

Q 4a)(ii)

Define following terms with respect to springs : 1) Free length 2) Solid height 3) Spring rate 4) Spring index

4

Q 4a)(iii)

Explain effect of keyways on strength of shaft. Name one type of key which does not affect strength of shaft

4

Q 4a)(iv)

Define following terms w.r.t. bolts: 1) Major diameter 2) Minor diameter 3) Pitch 4) Lead

4

Q 4 b )

In a four bar mechanism ABCD link AD is fixed and the crank AB rotates at 10 rad.......

4

Q 4b)(a)

Explain with neat sketch the working of variable displacement vane pump.

6

Q 4b)(b)

Compare pressure relief valve and pressure reducing valve.

6

Q 4b)(i)

(i) Explain different causes of gear tooth failure and suggest possible remedies to avoid such failures

6

Q 4b)(ii)

Explain the importance of Aesthetic considerations in design by giving any two examples.

6

Q 4b)(ii)

Explain the working of two stage reciprocating compressor.......

6

Q 4b)(l)

Explain how the heat balance sheet for an IC engine is prepared............

6

Q 4 c )

What are the advantages of ‘V’ belt drive over flat belt drive ?

4

Q 4 d )

Explain the working of flywheel with the help of turning moment diagram.

4

Q 4 e )

Explain the working of internal expanding brake with neat sketch.

4

Q 4 f )

A shaft has number of collars integral with it...........

4

Q 5 a )

List the factors to be considered for selecting the pipe while designing the pneumatic system. Give specification of pipes for the pneumatic system.

8

Q 5 a )

A cam with 40 mm minimum diameter rotates in clockwise...........

8

Q 5 a )

4 Stroke petrol engine

8

Q 5a)(i)

(i) Show that the efficiency of a self locking screw is less than 50%

8

Q 5a)(ii)

What is self locking property of threads and where it is necessary?

8

Q 5 b )

Draw and explain pneumatic meter in circuit to control of speed extension.

8

Q 5 b )

In the toggle mechanism as shown in Fig. (2), D is constrained......

8

Q 5 b )

State the methods used to improve thermal efficiency of gas turbine and explain any one.

8

Q 5b)(i)

(i) The extension springs are in considerably less use than compression springs. Why?

8

Q 5b)(ii)

Explain the terms self locking and overhauling of screw.

8

Q 5 c )

Explain with neat sketch (position based) working of sequencing circuit for two double acting Air cylinders.

8

Q 5 c )

A leather belt is required to transmit 7.5 kW from a pulley...........

8

Q 5c)(i)

Define following terms as applied to rolling contact bearings: 1) Basic static load rating 2) Basic dynamic load rating 3) Limiting speed

8

Q 5c)(ii)

List important physical characteristics of good bearing material.

8

Q 6 a )

Draw speed control of single acting cylinder pneumatic circuit using 3 × 2 DC valve

4

Q 6 a )

Draw profiles to square and Acme threads with full details. Which one is stronger?

4

Q 6 a )

Draw a neat sketch of Oldham’s coupling and explain the working of it.

4

Q 6 a )

The following results were obtained during Morse test on 4 stroke petrol engine

4

Q 6 b )

State any four reasons of failure of pneumatic seals.

4

Q 6 b )

State any four reasons of failure of pneumatic seals.

4

Q 6 b )

A helical valve spring is to be designed for an operating load range of approximately 135 N. The deflection of the spring for the load range is 7.5 mm. Assume spring index of 10. Permissible shear stress for the material of the spring = 480 MPa and its mo

4

Q 6 b )

Define following terms Fluctuation of energy, co-efficient of fluctuation of energy, co-efficient of fluctuation speed, maximum fluctuation of energy

4

Q 6 b )

What is the necessity of purification of air ? How to remove oil, moisture and dust from air.......

4

Q 6 c )

Draw the schematic diagram of turbojet engine.......

4

Q 6 c )

What are the advantages of pneumatic system over hydraulic systems ?

4

Q 6 c )

Explain the working of rope brake dynamometer with neat sketch

4

Q 6 c )

A bracket as shown in Figure No. 1 is fixed to a vertical steel column by means of five standard bolts.

4

Q 6 d )

Define : i) WBT ii) DPT.

4

Q 6 d )

Compare positive displacement pump with Rotodynamic pump.

4

Q 6 d )

Explain the working of single plate clutch with neat diagram.

4

Q 6 d )

What are rolling contact bearings? State their advantages over sliding contact bearings.

4

Q 6 e )

Explain the working of simple vapour absorption refrigeration system...........

4

Q 6 e )

What are the various types of Hoses used in pneumatic system

4

Q 6 e )

State reasons for balancing of rotating elements of machine. Explain balancing concept.

4

Q 6 e )

State the strength equation of double parallel fillet weld and single transverse fillet weld with neat sketches

4

Q 6 f )

Four masses A, B, C and D are attached to a shaft and revolve in the same plane..........

4

Examination: 2017 WINTER
Que.No Question/Problem marks
Q 1 a )

Define machine design.

2

Q 1a)(a)

State the four advantages and disadvantages of screw pump.

4

Q 1a)(a)

Define kinematic link and kinematic chain.

2

Q 1a)(a)

Draw p-v and T-S diagram for Diesel cycle. Name the processes involved in it.

4

Q 1a)(a)

Define kinematic link and kinematic chain.

2

Q 1a)(b)

Explain the construction of 4/2 poppet valve with neat sketch & symbol.

4

Q 1a)(b)

State types of cams.

2

Q 1a)(b)

Draw actual valve timing diagram for 4-stroke petrol engine.

4

Q 1a)(c)

State the essential properties of hydraulic fluids..........

4

Q 1a)(c)

State law of gearing.

2

Q 1a)(c)

Classify air compressors

4

Q 1a)(d)

Classify gas turbine on the basis of

4

Q 1a)(d)

Explain any two mounting methods of cylinder. ................

4

Q 1a)(d)

State the types of chains & sprockets.

2

Q 1a)(e)

State the function of flywheel in I.C. Engine.

2

Q 1a)(f)

State the function of governor.

2

Q 1a)(g)

Compare brakes and dynamometers. (any two points)

2

Q 1a)(h)

Why is balancing of rotating parts necessary for high speed engines ?

2

Q 1a)(i)

(a) Define : (i) Spherical pair (ii) Higher pair

2

Q 1 b )

Give the composition of

2

Q 1 b )

(b) Define : (i) Radial follower (ii) Off-set follower

2

Q 1 b )

State any four types of friction clutch, along with its application each.

4

Q 1 b )

Define slip and creep with reference to belt drive. Also state their effect on velocity ratio.

4

Q 1b)(a)

Draw a neat labelled sketch of fuel injection pump. Give its function.

6

Q 1b)(a)

Draw general layout of hydraulic system and explain its working. .................

6

Q 1b)(a)

Define completely constrained motion and successfully constrained motion with neat sketch. State one example of each.

4

Q 1b)(b)

Explain regeneration method to improve thermal efficiency of gas turbine with the help...

6

Q 1b)(b)

With a neat sketch explain pressure compensated flow control valve...............

6

Q 1b)(b)

State function of clutch. Explain working principle of clutch.

4

Q 1b)(ii)

2) Define : a) Ductility b) Toughness c) Creep

8

Q 1 c )

State four types of loads acting on machine elements

2

Q 1 c )

What do you mean by crowning of pulleys in flat belt drive ? State its use.

2

Q 1 d )

What do you mean by creep?

2

Q 1 d )

Define initial tension in belt drive & state its effect.

2

Q 1 e )

Define Ergonomics.

2

Q 1 e )

Define fluctuation of speed and fluctuation of energy in case of flywheel.

2

Q 1 f )

Give two applications of knuckle joint.

2

Q 1 f )

Define the sensitivity in relation to governer. State its significance.

2

Q 1 g )

Define following terms of spring:

2

Q 1 h )

How do you express the life of bearings?

2

Q 1 h )

State the adverse effect of imbalance of rotating elements of machine.

2

Q 1 i )

Draw the different thread profiles used for power screws.(Draw any four thread profiles)

2

Q 1 j )

State four types of keys.

2

Q 1 k )

Give two examples, where screwed joints are preferred over welded joints.

2

Q 1 l )

State any four applications of rolling contact bearings.

2

Q 1 m )

What are the requirement of a good coupling?

2

Q 1 n )

Draw stress – strain diagram for brittle material.

2

Q 2 a )

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

4

Q 2 a )

Reciprocating air compressor draws 6 kg of air per minute at 25°C. It compresses the air....

8

Q 2 a )

Explain various failures to be considered in designing a cotter joint along with the necessary sketches and strength equations.

8

Q 2 a )

Explain with neat sketch the working of hydraulic circuit for milling machine. ...........

8

Q 2 a )

Differentiate between machine and structure.

4

Q 2 b )

Describe with neat sketch the working of scotch yoke mechanism.

4

Q 2 b )

Name any eight pipe or tube fitting with their application..............

8

Q 2 b )

State the theories of elastic failure. Explain maximum normal stress theory and maximum shear stress theory with equations.

8

Q 2 b )

List various types of air motors. Explain vane type air motor with neat sketch...........

8

Q 2 b )

Explain with the neat sketch working of crank and slotted lever quick return mechanism.

4

Q 2 c )

Explain the inter-relation between linear and angular velocity, linear and angular acceleration with suitable example.

4

Q 2 c )

The following results were obtained during Morse test on 4-stroke petrol engine....

8

Q 2 c )

What is seal ? Classify seals according to shape. State the factors for seal selection.........

8

Q 2 c )

Define linear velocity, angular velocity, absolute velocity and state the relation between linear velocity and angular velocity.

4

Q 2c)(i)

(i) State and describe in brief about four ergonomic considerations in the designing of machine elements.

8

Q 2c)(ii)

(ii) How will select bearing from manufacturer catalogue?

8

Q 2 d )

Explain the Klein’s construction to determine velocity and acceleration of a link in an I.C. engine mechanism.

4

Q 2 d )

Explain the Klein’s construction to determine velocity and acceleration of single slider crank mechanism

4

Q 2 e )

Draw the labelled displacement, velocity and acceleration diagrams for a follower when it moves with simple harmonic motion.

4

Q 2 e )

Draw the labelled displacement, velocity and acceleration diagrams for a follower when it moves with uniform velocity.

4

Pages