Mechanical Engineering - Steam Boilers and Engines

21. 

The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called

A. induced steam jet draught
B. chimney draught
C. forced steam jet draught
D. none of these

Answer: Option C

Explanation:

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22. 

Which of the following statement is wrong ?

A. The factor of evaporation for all boilers is always greater than unity.
B. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
C. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
D. none of the above

Answer: Option D

Explanation:

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23. 

The function of a crosshead is to guide motion of the __________ and to prevent it from bending.

A. piston rod
B. connecting rod
C. eccentric rod
D. valve rod

Answer: Option A

Explanation:

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24. 

The cylinder dimensions of a compound engine may be designed on the basis of

A. equal power developed in each cylinder for uniform turning moment
B. equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
C. equal temperature drop in each cylinder for economy of steam
D. all of the above

Answer: Option D

Explanation:

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25. 

The function of a piston rod is

A. to guide motion of the piston rod and to prevent it from bending
B. to transfer motion from the piston to the cross head
C. to convert heat energy of the steam into mechanical work
D. to exhust steam from the cylinder at proper moment

Answer: Option B

Explanation:

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