A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227°C and 27°C. His claim is
A. Theoretically possible
B. Not possible
C. May be possible with lot of sophistications
D. Cost will be very high
Answer: Option B
This Question Belongs to Mechanical Engineering >> Engineering Thermodynamics
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Addition of heat at constant pressure to a gas results in
A. Raising its temperature
B. Raising its pressure
C. Raising its volume
D. Raising its temperature and doing external work
Which of the following items is not a path function?
A. Heat
B. Work
C. Kinetic energy
D. Thermal conductivity
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
A. Feasible
B. Impossible
C. Possible
D. Possible, but with lot of sophistications
The absolute zero pressure can be attained at a temperature of
A. 0°C
B. -273°C
C. 273 K
D. None of these
hanna ck plz write the correct explanation
What vinodini murugan written completely wrong
Output = 20 h.p = 14.914 Kw ( 1hp = 0.746 kW)
input = 400 Kcal/min = 27.8932 (1k cal/min = 0.07 kW)
Higher temperature ( T ) = 227° C = 273 + 227 = 500°C
Lower temperature ( t ) = 27° C = 273 + 27 = 300°C
Ideal coeffiecient of performance = = 0.4
Actual cop = output /input = 14.914/27.8932 = 0.532
Here the actual cop is greater than ideal which is not possible.
Therefore his claim is false
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1hp = 746 watt
1 metric tonn= 1000kg
Ans B not possible
How