|
Q 2 a ) |
Differentiate vapour compression and vapour absorption refrigeration system......... |
8 |
|
Q 2 a ) |
Explain a scotch yoke mechanism with a neat sketch. |
4 |
|
Q 2 b ) |
Explain with the help of neat sketches, the design procedure of a square sunk key |
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 c ) |
Explain the construction and working of doubled acting reciprocating compressor with neat sketch. |
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 ) |
A four stroke gas engine has a cylinder diameter of 25 cm and stroke 45 cm... |
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 ) |
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 a ) |
State the composition of the materials 30 Ni 16 Cr5, 40C8, FeE230 X15Cr25Ni 12 |
4 |
|
Q 3 a ) |
List any four pollutants in exhaust gases of I.C. engine with their effects. |
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 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 ) |
Compare closed cycle and open cycle gas turbine. |
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 c ) |
State the ‘Lewis equation’ for spur gear design. State SI unit of each term in the equation. |
4 |
|
Q 3 c ) |
Define i) Humidity ratio, ii) Specific humidity |
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 ) |
Explain why bolts of uniform strength are preferred. Draw sketches of two different types of bolts of uniform strength |
4 |
|
Q 3 d ) |
Name four sensors used in I.C. engine and explain working of any one. |
4 |
|
Q 3 d ) |
Three masses 10 kg, 20 kg and 15kg are attached at a point ........ |
4 |
|
Q 3 e ) |
Draw pilot operated DA cylinder circuit ............. |
4 |
|
Q 3 e ) |
Prove that for a square key sc = 2t where sc = crushing stress t = shear stress. |
4 |
|
Q 3 e ) |
What is scavenging in I.C. engine ? State its types. |
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)
|
State four disadvantages of screwed joints. |
4 |
|
Q 4a)(iv)
|
Draw symbol of............. |
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 ) |
Explain with neat sketch construction and working of ice plant. |
8 |
|
Q 5 a ) |
In a slider crank mechanism the length of crank and connecting rod are 100mm .......... |
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 ) |
Explain construction and working of gear pump. |
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 ) |
A single cylinder reciprocating compressor has a bore of 120 mm and a stroke of 150 mm... |
8 |
|
Q 5 b ) |
Draw profile of cam to raise the valve with S.H.M. through 5cm.......... |
8 |
|
Q 5 c ) |
Explain working of directly operated......... |
8 |
|
Q 5 c ) |
Explain with neat sketch construction and working of constant volume gas turbine. |
8 |
|
Q 5 c ) |
In a band and block brake shown in Fig....... |
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 ) |
In cold climate why oil tank is equipped with oil heaters? Explain. |
4 |
|
Q 6 a ) |
What is the necessity of purification of air in compressor and how it is done ? |
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 ) |
Compare meter in circuit and meter out circuit |
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 ) |
PQRS is a four bar chain with link PS fixed.......... |
8 |
|
Q 6 b ) |
State two applications of leaf spring. Draw neat sketch of leaf spring |
4 |
|
Q 6 c ) |
Draw the hydraulic circuit for shaping machine........ |
4 |
|
Q 6 c ) |
Define (i) Dew point temp. (ii) Wet bulb temp |
4 |
|
Q 6 c ) |
Determine the power lost in a footstep bearing........... |
8 |
|
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 d ) |
Draw constructional details of pneumatic hose........ |
4 |
|
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 e ) |
How can the speed control of any actuator be achieved........ |
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 |
