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-6 section-1

In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

A) 260 kW B) 282 kW C) 296 kW D) 302 kW

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Answer & Solution

Answer: Option B

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A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

A) Receiver type compound engine B) Tandem type compound engine C) Woolf type compound engine D) Both (A) and (B)

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Answer & Solution

Answer: Option A

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A compound steam engine in which piston rods of high pressure and low pressure cylinder's are attached to two different cranks set at 180° to each other, is called

A) Receiver type compound engine B) Tandem type compound engine C) Woolf type compound engine D) Both (A) and (B)

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Answer & Solution

Answer: Option C

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The temperature of flue gases at air heater outlet should be

A) 100°C B) Above dew point temperature of flue gases C) Below dew point temperature of flue gases D) Less than wet bulb temperature of flue gases

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Answer & Solution

Answer: Option B

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The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

A) 10 to 15% B) 15 to 20% C) 20 to 30% D) 30 to 40%

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Answer & Solution

Answer: Option A

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In a reaction turbine

A) The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades B) The expansion of steam takes place partly in the fixed blades and partly in the moving blades C) The steam is expanded from a high pressure to a condenser pressure in one or more nozzles D) The pressure and temperature of steam remains constant

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Answer & Solution

Answer: Option B

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The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be

A) 0.4 B) 0.56 C) 0.67 D) 1.67

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Answer & Solution

Answer: Option A

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The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

A) More B) Less C) Same D) None of these

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Answer & Solution

Answer: Option B

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In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

A) Low B) Very low C) High D) Very high

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Answer: Option D

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Expanding steam to a very low pressure (high vacuum) in steam engines is

A) Desirable B) Economical C) Essential D) Uneconomical

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Answer & Solution

Answer: Option D

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