Series OSS                                                                                                                        Code No. 106
                                                                       MECHANICAL ENGINEERING 
                                                                                     (Theory)

Time Allowed: 3 Hours                                                                                           Maximum Marks : 60
Instructions :
(i) Attempt any five questions.
(ii) All questions carry equal marks.

 

1. (a) Why are pulleys crowned ?    3
    (b) Explain a simple gear train.    3
    (c) Explain the working of a single plate clutch.    6

 

2. (a) Give the uses of steam turbines.    6
    (b) Explain the working of a Babcock & Wilcox boiler.    6

 

3. Explain, with the help of neat sketches, the working of a four-stroke diesel engine.    12

 

4. (a) Explain the working principle of a water turbine.    6
    (b) Explain air-cooling system of I.C. engines.    6

 

5. (a) Describe the construction and working of a concrete mixer.    6
    (b) Give the function and use of an economiser.    6

 

6. (a) Give the uses of compressed air.    6
    (b) Sketch a speed cone pulley.            6

 

7. Explain the functions of the following:         6
   (a) Safety valve 
   (b) Screw jack

 

8. Briefly answer the following:     3 x 4
(a) Define velocity ratio.
(b) Give the uses of a chain drive.
(c) Give the location of steam stop valve in a boiler.
(d) Define compression ratio.