250+ TOP MCQs on Classification based on Application, Cycle and Fuel – 2 and Answers

tricky Steam and Gas Turbines questions and answers on “Classification based on Application, Cycle and Fuel – 2”.

1. This turbine receives steam at high pressure of 600 to 900 psi and discharges it at pressure suitable for supplying to existing low pressure plant. Identify the turbine?
a) Topping Turbine
b) Back-Pressure Turbine
c) Condensing Turbine
d) Extraction Turbine
Answer: a
Clarification: Topping turbine are specially designed turbine for this application in industry.

2. Arjun underwent industrial training in his 2nd year at National Thermal Power Plant. But he was surprised to know that a special turbine is used to meet the electrical energy requirement in the plant itself. Can you identify which turbine did he observe?
a) High Pressure Condensing Turbine
b) House Turbine
c) Gas Turbine
d) Mixed Pressure Turbine
Answer: b
Clarification: Exhaust or extraction steam may be used for feedwater heater.

3. Tanuj and Shyam have a strong discussion over the advantages of Induction-Extraction turbine.
Tanuj: They are employed when a particular manufacturing process require a large quantity of steam at a particular pressure.
Shyam: They are employed when an abundance of waste steam is available at the same pressure. Which one the two you think is correct?
a) Tanuj
b) Shyam
c) Tanuj & Shyam
d) None of the mentioned
Answer: c
Clarification: They are used in both situations.

4. Where in industries do we find back-pressure turbines?
a) At a point in industry where waste steam has to be employed
b) When pressure needs to be applied at rear end
c) When one turbine bolster other
d) There is a requirement of process steam at single pressure
Answer: d
Clarification: These discharge steam into a pressurized piping system to be used for process heating.

5. This turbine is an ingenious method for accomplishing multi velocity staging in a single wheel. Name this turbine?
a) Tangential Turbine
b) Single Stage Impulse Turbine
c) Multi Stage Impulse Turbine
d) None of the mentioned
Answer: a
Clarification: They have reversing chamber equipped with stationary blades which reverses the direction of the steam leaving the moving blades.

6. A marine officer asks you to design a turbine for marine propulsion. Which of the below would be your best choice?
a) Mixed pressure turbine
b) Condensing high pressure regenerative turbine
c) Gas Turbine
d) Tandem-Compound double flow turbine
Answer: b
Clarification: Due to high pressure generated by them.

7. A multipass turbine is a prime mover.
a) True
b) False
Answer: a
Clarification: Prime mover includes every engine that can convert the chemical energy of fuel into useful work.

8. In Europe special types of turbines are used that do not have fixed blades so that pressure drop are necessary in all blade passages. Which turbine is it?
a) Tangential Turbine
b) Axial Flow Turbine
c) Radial Turbine
d) None of the mentioned above
Answer: c
Clarification: They have blades rotating in the opposite direction with two concentric shafts and two generators.

9. You own an industry in which the boiler generates a lot of waste steam which you think could be utilized. Which turbine will you utilize?
a) Mixed Pressure Turbine
b) Back Pressure Turbine
c) Twin-Shaft Gas Turbine
d) Induction-Extraction Turbine
Answer: d
Clarification: They have the capability to admit steam at a given pressure when available.

10. Mac doubts that why do we use House Turbine in National Thermal Power Plants. Can you clear his doubts?
a) The exhaust steam or extraction steam is used for feedwater heating or to supply steam for small turbines serving as auxiliary drives
b) Have huge capacity sufficient enough to run the plant
c) Have minimum losses
d) They can be vertical compounded
Answer: a
Clarification: Their ability to heat feedwater using extraction or exhaust steam.

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