Thermodynamics Questions and Answers – Brayton Cycle-2

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Brayton Cycle-2”.

1. How can regeneration be used to improve the efficiency of Brayton cycle?
a) the energy of exhaust gas can be used to heat up the air which leaves the compressor
b) heat supplied from external source thus decreases
c) the amount of heat rejected also decreases
d) all of the mentioned
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2. The temperature of air leaving turbine is less than that of air leaving compressor.
a) true
b) false
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3. In the regenerator,
a) temperature of air leaving the compressor is raised
b) temperature of air leaving the turbine is raised
c) both of the mentioned
d) none of the mentioned
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4. Which of the following statement is true for a regenerator?
a) mean temperature of heat addition decreases
b) mean temperature of heat rejection decreases
c) both of the mentioned
d) none of the mentioned
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5. By using a regenerator,
a) efficiency increases, work output decreases
b) both efficiency and work output increases
c) efficiency increases, work output remains unchanged
d) efficiency remains same, work output increases
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6. Which of the following is true about a regenerator?
a) it is costly
b) it is heavy and bulky
c) it causes pressure losses
d) all of the mentioned
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7. When we add a regenerator, cycle efficiency always increases.
a) true
b) false
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8. When the turbine efficiency and compressor efficiency decreases, the cycle efficiency ____
a) decreases
b) increases
c) remains same
d) none of the mentioned
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9. The ____ the pressure ratio, the ____ will be efficiency.
a) less, more
b) less, less
c) more, more
d) more, less
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10. As the pressure ratio increases, the efficiency steadily ____
a) decreases
b) increases
c) remains constant
d) none of the mentioned
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11. The maximum pressure ratio is given by
a) (Tmin/Tmax)^((ɣ-1)/ɣ)
b) (Tmin/Tmax)^(ɣ/(ɣ-1))
c) (Tmax/Tmin)^((ɣ-1)/ɣ)
d) (Tmax/Tmin)^(ɣ/(ɣ-1))
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12. The optimum value of pressure ratio at which work capacity becomes maximum is given by
a) (Tmin/Tmax)^((ɣ-1)/2ɣ)
b) (Tmax/Tmin)^(ɣ/2(ɣ-1))
c) (Tmax/Tmin)^(2(ɣ-1)/ɣ)
d) (Tmax/Tmin)^(2ɣ/(ɣ-1))
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13. The relation between maximum pressure ratio and optimum pressure ratio is given by
a) optimum pressure ratio = (maximum pressure ratio)/2
b) optimum pressure ratio = maximum pressure ratio
c) optimum pressure ratio = sqrt(maximum pressure ratio)
d) optimum pressure ratio = (maximum pressure ratio)^2
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14. Which of the following statement is true?
a) maximum work done = (specific heat at constant preferred)*(sqrt(Tmax) – sqrt(Tmin))^2
b) efficiency of cycle = 1- sqrt(Tmin/Tmax)
c) both of the mentioned
d) none of the mentioned
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15. The efficiency of Brayton cycle can be increased by using staged heat supply or by use of staged compression with intercooling.
a) true
b) false
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Sanfoundry Global Education & Learning Series – Thermodynamics.
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