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Power Plant Engineering Multiple Choice Questions | MCQs | Quiz

Power Plant Engineering Interview Questions and Answers
Practice Power Plant Engineering questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Steam Power Plant
•   Rankine & Carnot Cycle
•   Rankine Cycle
•   Brayton Cycle
•   Heat Mean Temperature - 1
•   Heat Mean Temperature - 2
•   Thermal Efficiuency
•   Steam Reheaters - 1
•   Steam Reheaters - 2
•   Regeneration - 1
•   Regeneration - 2
•   Regenerative Feedwater
•   Feedwater Heaters - 1
•   Feedwater Heaters - 2
•   Rankine Carnotinization
•   Optimum Regeneration
•   Stem Power Plant
•   Power Plant Appraisal
•   Deaerator - 1
•   Deaerator - 2
•   Power Plant Efficiencies-1
•   Power Plant Efficiencies-2
•   Power & Process Heat
•   Vapor Cycle Characteristics
•   Binary Vapour Cycle - 1
•   Binary Vapour Cycle - 2
•   Coupled Cycles
•   Power Generation
•   Gas Turbine Power Plant - 1
•   Gas Turbine Power Plant - 2
•   Gas Turbine Power Plant - 3
•   Fuel Oil
•   Coal Oil & Water Mixtures-1
•   Coal Oil & Water Mixtures-2
•   Synthetic Fuels & Biomass
•   Draught System
•   Heat Combustion - 1
•   Heat Combustion - 2
•   Heat Combustion - 3
•   Nuclear Reactions - 1
•   Nuclear Reactions - 2
•   Nuclear Fission
•   Chain Reaction
•   Radioactive Decay - 1
•   Radioactive Decay - 2
•   Fission Analysis - 1
•   Fission Analysis - 2
•   Pelton Wheel Turbine
•   Francis & Deriaz Turbines-1
•   Francis & Deriaz Turbines-2
•   Diesel Engine Basics
•   Diesel Engine Types - 1
•   Diesel Engine Types - 2
•   Diesel Engine Analysis
•   Pulverisation & Gasifiers
•   Kinetic & Diffusion Control-1
•   Kinetic & Diffusion Control-2
•   Coal Firing Systems - 1
•   Coal Firing Systems - 2
•   Combined Cycles
•   Brayton Rankine Plant - 1
•   Brayton Rankine Plant - 2
•   Rankine Cycle Advantages
•   Steam Turbines Basics - 1
•   Steam Turbines Basics - 2
•   Turbine & Nozzles - 1
•   Turbine & Nozzles - 2
•   Turbine & Nozzles Types
•   Turbine Blading - 1
•   Turbine Blading - 2
•   Electricity Generation - 1
•   Electricity Generation - 2
•   Steam Generators
•   Steam Generator Types - 1
•   Steam Generator Types - 2
•   Fire Tube Boilers - 1
•   Fire Tube Boilers - 2
•   Water Tube Boilers
•   Superheaters & Reheaters
•   Preheaters & Deareration
•   Evaporation & Steam Purity
•   Plant Basics
•   Power Plant Generation
•   Fuel Cell
•   Energy Sources
•   Miscellaneous
•   Environmental Degradation1
•   Environmental Degradation2

Best Reference Books

Power Plant Engineering Books

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Power Plant Questions and Answers – Reheating of Steam-2

Posted on June 14, 2017 by Manish

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Reheating of Steam”.

1. The product of steam rate & network when the steam rate is expressed in kg/kWh is equal to?
a) 36
b) 360
c) 3600
d) 60
View Answer

Answer: c
Explanation: The Steam Rate in terms of kJ/kWh is given by the expression,
Steam Rate = (3600/Wnet) kg/kWh.
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2. The product of heat rate & efficiency when the heat rate is expressed in kJ/kWh is equal to?
a) 60
b) 36
c) 360
d) 3600
View Answer

Answer: d
Explanation: The heat rate in terms of kJ/kWh is given by the expression,
Heat Rate = (3600/n) kJ/kWh
where, n = efficiency.

3. What is the effect of reheat pressure on mean temperature of heat addition Tml?
a) Reheat pressure is directly proportional to Tml
b) Reheat pressure is inversely proportional to Tml
c) Reheat pressure is equal to Tml
d) Tml is independent of reheat pressure
View Answer

Answer: a
Explanation: As cycle efficiency is reduced with a decrease in reheat pressure. Hence, the mean temperature of heat addition also decreases.

4. Why is the steam not allowed to expand deep into the two phase region before it is taken to reheating?
a) to control flow rate
b) to control phase change
c) to protect reheat tubes
d) none of the mentioned
View Answer

Answer: c
Explanation: The steam is not allowed to expand deep into the two phase region before it is taken to reheating, because the moisture particles in the steam while evaporating would leave behind solid deposits in the form of scale which is difficult to remove. Hence, when the steam expands, the reheat tubes are damaged.

5. Net Work output of the plant __________ with reheat.
a) decreases
b) increases
c) remains same
d) none of the mentioned
View Answer

Answer: b
Explanation: With reheat, the area under the curve increases in comparison to what it was without reheat. Hence, Net Work output of the plant increases.
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6. Which of the following problems are posed by increasing the number of reheats?
a) Cost & Fabrication problems arise
b) Heat transfer problems arise
c) Frictional losses arise
d) None of the mentioned
View Answer

Answer: a
Explanation: Higher the number of Reheats, still higher steam pressures could be used, but mechanical stresses increase at a higher proportion than the increase in pressure, because of the prevailing high temperature. The cost & fabrication difficulties will also increase.

7. What is the effect of decrease of reheat pressure on the quality of steam at turbine exhaust?
a) decreases
b) increases
c) remains same
d) none of the mentioned
View Answer

Answer: b
Explanation: For too low a reheat pressure, the exhaust steam may even be in the superheated state which isn’t good.

8. The optimum reheat pressure for most of the power plants is how many times of the initial steam pressure?
a) 0.1-0.15
b) 0.2-0.20
c) 0.2-0.25
d) 0.1-0.10
View Answer

Answer: c
Explanation: The efficiency increases as the reheat pressure is lowered & reaches a peak at a pressure ratio between 0.2-0.25.

9. What is the most preferable dryness fraction of the exhaust steam?
a) 0.99
b) 0.77
c) 0.66
d) 0.88
View Answer

Answer: d
Explanation: The dryness fraction of the exhaust steam is in the range of 0.86-0.88 for modern turbines.

10. For pressure ratio = 1, efficiency = 0,
a) reheat is used
b) reheat is not used
c) only reheat is used
d) none of the mentioned
View Answer

Answer: b
Explanation: There cannot be any reheat cycle employed when the cycle efficiency is zero and the pressure ratio is equal to 1.
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Sanfoundry Global Education & Learning Series – Power Plant Engineering.

To practice all areas of Power Plant Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Power Plant Questions and Answers – Regeneration – 1 »
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Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

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