Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers

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-9 section-1

The number of water level indicators in a boiler are generally __________ in number.

A) One B) Two C) Three D) Four

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Answer & Solution

Answer: Option B

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The fire tubes in a Cochran boiler usually have _________ diameter.

A) 6.25 mm B) 62.5 mm C) 72.5 mm D) 92.5 mm

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Answer: Option B

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The fire tubes in a Locomotive boiler has __________ diameter.

A) 4.75 mm B) 5.47 mm C) 7.45 mm D) 47.5 mm

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Answer: Option D

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Which of the following is correct?
(Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure and K = Diagram factor)

A) $${\text{pa}} = \frac{{{\text{pm}}}}{{\text{K}}}$$ B) $${\text{pa}} = {\text{pm}} \times {\text{K}}$$ C) $${\text{pa}} = \frac{{\text{K}}}{{{\text{pm}}}}$$ D) $${\text{pa}} = {\text{pm}} + {\text{K}}$$

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Answer: Option B

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The critical pressure ratio $$\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)$$ is given by

A) $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = {\left( {\frac{2}{{{\text{n}} - 1}}} \right)^{\frac{{\text{n}}}{{{\text{n}} + 1}}}}$$ B) $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = {\left( {\frac{2}{{{\text{n}} + 1}}} \right)^{\frac{{\text{n}}}{{{\text{n}} - 1}}}}$$ C) $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = {\left( {\frac{{{\text{n}} - 1}}{2}} \right)^{{\text{n}} + \frac{1}{{\text{n}}}}}$$ D) $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = {\left( {\frac{{{\text{n}} + 1}}{2}} \right)^{{\text{n}} - \frac{1}{{\text{n}}}}}$$

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Answer: Option B

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The main object of a boiler trial is

A) To determine the generating capacity of the boiler B) To determine the thermal efficiency of the boiler when working at a definite pressure C) To prepare heat balance sheet for the boiler D) All of the above

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Answer: Option D

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The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

A) Feed pump B) Injector C) Feed check valve D) Pressure gauge

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Answer: Option A

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The function of a safety valve is

A) To blow off steam when the pressure of steam inside the boiler exceeds the working pressure B) To indicate the water level inside the boiler to an observer C) To measure pressure of steam inside the steam boiler D) None of the above

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Answer: Option A

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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 D) None of these

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Answer: Option C

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Adiabatic process is

A) Essentially an isentropic process B) Non-heat transfer process C) Reversible process D) Constant temperature process

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Answer: Option B

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