Steam Nozzles and Turbines - Mechanical Engineering Questions and Answers

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

6.25 mm

62.5 mm

72.5 mm

92.5 mm

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The fire tubes in a Locomotive boiler has __________ diameter.

4.75 mm

5.47 mm

7.45 mm

47.5 mm

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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)

pa = pm/K

pa = pm × K

pa = K/pm

pa = pm + K

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The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [2/(n - 1)] n/(n + 1)

(p₂/p₁) = [2/(n + 1)] n/(n-1)

(p₂/p₁) = [(n - 1)/2] n + (1/n)

(p₂/p₁) = [(n + 1)/2] n - (1/n)

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The main object of a boiler trial is

To determine the generating capacity of the boiler

To determine the thermal efficiency of the boiler when working at a definite pressure

To prepare heat balance sheet for the boiler

All of the above

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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

Feed pump

Injector

Feed check valve

Pressure gauge

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The function of a safety valve is

To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

To indicate the water level inside the boiler to an observer

To measure pressure of steam inside the steam boiler

None of the above

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The function of a piston in a steam engine is

To guide motion of the piston rod and to prevent it from bending

To transfer motion from the piston to the cross-head

To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

None of these

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Adiabatic process is

Essentially an isentropic process

Non-heat transfer process

Reversible process

Constant temperature process