Mechanical Engineering - Steam Boilers and Engines

1. 

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

A. 50° C and normal atmospheric pressure
B. 50° C and 1.1 bar pressure
C. 100° C and normal atmospheric pressure
D. 100° C and 1.1 bar pressure

Answer: Option C

Explanation:

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2. 

A condenser maintains a low pressure (below atmospheric) so as to obtain the maximum possible energy from steam and thus to secure a high efficiency.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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3. 

The amount of water evaporated from and at 100° C into dry and saturated steam is called evaporative capacity of a boiler.

A. Yes
B. No

Answer: Option B

Explanation:

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4. 

The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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5. 

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

A. 0.007 bar
B. 0.053 bar
C. 0.06 bar
D. 0.067 bar

Answer: Option D

Explanation:

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