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Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers | Mechanical Engineering

Learn Steam Boilers, Engines, Nozzles And Turbines MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Steam Boilers, Engines, Nozzles And Turbines MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-7 section-2

Each section contains 100 MCQs on Steam Boilers, Engines, Nozzles and Turbines .
61
In cross compounding, the cylinders are arranged
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Answer & Solution
Answer: Option B
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62
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called
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Answer & Solution
Answer: Option B
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63
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
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Answer & Solution
Answer: Option B
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64
The theoretical indicator diagram of a simple steam engine is based upon the assumption that
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Answer & Solution
Answer: Option D
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65
The clearance in the engine cylinder
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Answer & Solution
Answer: Option D
Solution:
Clearance in the engine cylinder is the volume left between the piston and the cylinder head when the piston is at top dead center.

This clearance is essential for mechanical reasons, such as preventing contact between piston and valves.

But increasing this clearance leads to:

✔ Lower Compression Ratio: More clearance means less compression, reducing engine power and efficiency.

✘ Mean Effective Pressure (MEP) does not increase: In fact, it decreases because the combustion gases expand over a larger volume with less pressure buildup.

✘ Work Done does not increase: With a lower pressure due to lower compression, the work output also drops.

✔ Overall, efficiency drops as more heat is wasted and less useful work is obtained.

Thus, only Option C is correct. Options A and B are incorrect, so D (All of these) is wrong.
66
When steam after doing work in the cylinder passes into a condenser, the engine is said to be a
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Answer & Solution
Answer: Option C
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67
Relative percentage of heat absorbed through the heat transfer of
(i) Furnace water wall
(ii) Boiler tank
(iii) Superheater
(iv) Economizer
(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of
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Answer & Solution
Answer: Option A
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68
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called
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Answer & Solution
Answer: Option D
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69
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
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Answer & Solution
Answer: Option A
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70
'Locomotive type' boiler is
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Answer & Solution
Answer: Option D
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