Mechanical Engineering - Steam Boilers and Engines

6. 

The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A. efficiency of the boiler
B. efficiency of the chimney
C. efficiency of the fan
D. power of the boiler

Answer: Option B

Explanation:

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7. 

The function of a piston in a steam engine 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 id) to exhaust steam from the cylinder at proper moment

Answer: Option C

Explanation:

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8. 

The high steam and low water safety valve is not used in

A. Cochran boiler
B. Cornish boiler
C. Lancashire boiler
D. Locomotive boiler

Answer: Option D

Explanation:

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9. 

In a Woolf type compound engine, the high pressure and low pressure cylinders

A. have common piston rod
B. are set at 90°
C. have separate piston rod
D. are set in V - arrangement

Answer: Option C

Explanation:

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10. 

The actual power generated in the engine cylinder is called

A. indicated power
B. brake power
C. frictional power
D. none of these

Answer: Option A

Explanation:

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