MCQs
Total Questions : 65
| Page 6 of 7 pages
Answer: Option A. -> 28.25 degree Celsius
Answer: (a).28.25 degree Celsius
Answer: (a).28.25 degree Celsius
Question 52. Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m² hr degree, what heat exchanger area is required to handle the load for parallel flow arrangement?
Answer: Option D. -> 4.547 m²
Answer: (d).4.547 m²
Answer: (d).4.547 m²
Answer: Option A. -> 200%
Answer: (a).200%
Answer: (a).200%
Answer: Option C. -> 2.2
Answer: (c).2.2
Answer: (c).2.2
Question 55. A steam condenser is transferring 250 k W of thermal energy at a condensing temperature of 65 degree Celsius. The cooling water enters the condenser at 20 degree Celsius with a flow rate of 7500 kg/hr. If overall heat transfer coefficient for the condenser surface is 1250 W/m² K, what surface area is required to handle this load?
Answer: Option D. -> 7.08 m²
Answer: (d).7.08 m²
Answer: (d).7.08 m²
Question 56. Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m² hr degree, what heat exchanger area is required to handle the load for counter flow arrangement?
Answer: Option B. -> 3.758 m²
Answer: (b).3.758 m²
Answer: (b).3.758 m²
Answer: Option C. -> 1465
Answer: (c).1465
Answer: (c).1465
Answer: Option A. -> 920
Answer: (a).920
Answer: (a).920
Answer: Option B. -> Bakelite
Answer: (b).Bakelite
Answer: (b).Bakelite
Answer: Option A. -> 835
Answer: (a).835
Answer: (a).835