MCQs
Total Questions : 65
| Page 2 of 7 pages
Question 11. Hot water having specific heat 4200 J/kg K flows through a heat exchanger at the rate of 4 kg/min with an inlet temperature of 100 degree Celsius. A cold fluid having a specific heat 2400 J/kg K flows in at a rate of 8 kg/min and with inlet temperature 20 degree Celsius. Make calculations for maximum possible effectiveness if the fluid flow conforms to parallel flow arrangement
Answer: Option A. -> 0.533
Answer: (a).0.533
Answer: (a).0.533
Answer: Option A. -> 1, 2 and 3
Answer: (a).1, 2 and 3
Answer: (a).1, 2 and 3
Question 13. In a food processing plant, a brine solution is heated from – 12 degree Celsius to – 65 degree Celsius in a double pipe parallel flow heat exchanger by water entering at 35 degree Celsius and leaving at 20.5 degree Celsius. Let the rate of flow is 9 kg/min. Estimate the area of heat exchanger for an overall heat transfer coefficient of 860 W/m² K. For water c P = 4.186 * 10³ J/kg K
Answer: Option B. -> 0.293 m²
Answer: (b).0.293 m²
Answer: (b).0.293 m²
Question 14. A cold fluid (specific heat 2.95 k J/kg K) at 10 kg/min is to be heated from 25 degree Celsius to 55 degree Celsius in a heat exchanger. The task is accomplished by extracting heat from hot water (specific heat 4.186 k J /kg K) available at mass flow rate 5 kg/min and inlet temperature 85 degree Celsius. Identify the type of arrangement of the heat exchanger
Answer: Option C. -> Counter flow
Answer: (c).Counter flow
Answer: (c).Counter flow
Question 15. A counter flow heat exchanger is used to col 2000 kg/hr of oil (c p = 2.5 k J/kg K) from 105 degree Celsius to 30 degree Celsius by the use of water entering at 15 degree Celsius. If the overall heat transfer coefficient is expected to be 1.5 k W/m² K, find out the water flow rate. Presume that the exit temperature of the water is not to exceed 80 degree Celsius
Answer: Option D. -> 1380.2 kg/hr
Answer: (d).1380.2 kg/hr
Answer: (d).1380.2 kg/hr
Answer: Option D. -> Concrete
Answer: (d).Concrete
Answer: (d).Concrete
Answer: Option B. -> Feed water heaters
Answer: (b).Feed water heaters
Answer: (b).Feed water heaters
Answer: Option A. -> 1260
Answer: (a).1260
Answer: (a).1260
Answer: Option D. -> 1300
Answer: (d).1300
Answer: (d).1300
Answer: Option A. -> 800
Answer: (a).800
Answer: (a).800