- 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
Steam Boilers, Engines, Nozzles and Turbines
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The main object of a boiler trial is_____.
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The performance of a boiler is measured by the_____.
- A. Amount of water evaporated per hour
- B. Steam produced in kg/h
- C. Steam produced in kg/kg of fuel burnt
- D. All of these
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The radius of a dished head is taken approximately as_____.
- A. One fourth
- B. Half
- C. One
- D. Two
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A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as_____.
- A. Blow off cock
- B. Fusible plug
- C. Superheater
- D. Stop valve
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When steam after doing work in the cylinder passes into a condenser, the engine is said to be a_____.
- A. Slow speed engine
- B. Vertical steam engine
- C. Condensing steam engine
- D. Non-condensing steam engine
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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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In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
- A. Velocity increases
- B. Velocity decreases
- C. Velocity remains constant
- D. Pressure remains constant
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The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle).
- A. sin²α
- B. cos²α
- C. tan²α
- D. cot²α
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Boiler parameters are expressed by_____.
- A. Tonnes/hr. of steam
- B. Pressure of steam in kg/cm²
- C. Temperature of steam in °C
- D. All of the above
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The diameter of fire tubes in Cochran boiler is of the order of_____.
- A. 2 cm
- B. 6 cm
- C. 8 cm
- D. 12 cm