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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 – Brayton Cycle

Posted on June 14, 2017 by Manish

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

1. A gas turbine works on?
a) Carnot cycle
b) Brayton cycle
c) Dual cycle
d) Rankine cycle
View Answer

Answer: b
Explanation: A gas turbine works on 2 isentropic and 2 isobaric processes which is nothing else but Brayton cycle.
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2. What is the range of Thermal efficiency in Brayton cycle?
a) 30-35%
b) 40-45%
c) 50-55%
d) 50-60%
View Answer

Answer: c
Explanation: Efficiency of Brayton cycle in actual working condition is found to be between 35 to 45%.

3. What is the maximum possible TIT(Turbine Inlet Temperature)?
a) 1000 K
b) 1500 K
c) 950 K
d) 1300 K
View Answer

Answer: d
Explanation: The maximum temperature is limited by metallurgical conditions.

4. A simple Brayton cycle uses Helium as the working fluid, has a maximum temperature of 1000 K, and a pressure ratio of 4. At the start of the compression, the Helium pressure and temperature are 50 kPa and 250 K. Based upon cold-air standard analysis assumptions, the thermal efficiency of the cycle is:
a) 0.13
b) 0.23
c) 0.43
d) 0.53
View Answer

Answer: d
Explanation: Using the pressure ratio = 1 – rp(1 – k) / k.
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5. A simple Brayton cycle has a pressure ratio of 5 and a maximum temperature of 900 K. Air enters the compressor at 100 kPa, 300 K. Based upon cold-air standard analysis assumptions, the back-work ratio of this cycle is:
a) 0.23
b) 0.53
c) 0.48
d) 0.36
View Answer

Answer: b
Explanation: Using the pressure ratio and isentropic process relations, T2 = T1rp(k – 1) / k = 475 K and T4 = T3rp(1 – k) / k = 568 K. Application of the first law to the compressor and turbine processes and substituting the results into the back-work ratio definition produces rb = (T2 -T1) / (T3 -T4) = 0.53.

6. Which of the following methods can be used to increase efficiency of a Brayton cycle?
a) Regeneration
b) Increasing pressure ratio
c) Heat exchanger
d) All of the mentioned
View Answer

Answer: d
Explanation: A heat exchanger that acts as a counter-flow energy recovery device positioned within the supply and exhaust air streams of an air handling system, in order to recover the waste heat.

7. For the same maximum pressure and heat input, the most efficient cycle is?
a) Brayton cycle
b) Carnot cycle
c) Rankine cycle
d) Dual cycle
View Answer

Answer: a
Explanation: Efficiency of a Brayton cycle is directly proportional to pressure ratio.
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8. The compression ratio is the ratio of?
a) Swept volume to total volume
b) Total volume to swept volume
c) Total volume to clearance volume
d) None of the mentioned
View Answer

Answer: a
Explanation: According to definition, compression ratio is the ratio of swept volume to total volume.

9. A Sterling engine uses an energy source whose temperature is 727°C and an energy sink whose temperature is 27°C. How much heat must be added to the engine to produce 1 unit of work?
a) 1.10
b) 1.19
c) 1.43
d) 2.0
View Answer

Answer: c
Explanation: Since the Sterling engine is totally reversible, its thermal efficiency is the same as that of a Carnot engine, η = 1 – Tl / Th = 0.7. Now, the definition of the thermal efficiency gives Qin / Wout = 1 / η = 1.43.

10. Which of the following is not a component of Brayton cycle?
a) Compressor
b) Combustion Chamber
c) Turbine
d) Pump
View Answer

Answer: d
Explanation: Pump is used in Rankine cycle to circulate water from Condenser to Boiler.

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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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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