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MCQs

Total Questions : 368 | Page 5 of 37 pages
Question 41. What is the energy balance to open system?
  1.    Energy in the system is constant
  2.    Matter in the system is constant
  3.    Matter is constant energy is variable
  4.    Both matter and energy are variable
 Discuss Question
Answer: Option D. -> Both matter and energy are variable
Answer: (d).Both matter and energy are variable
Question 42. 1 Kg of water is pumped to a height of 1 m, the enthalpy is changed by 5 J/Kg, and work done by the motor is 25 J/Kg, assuming system is insulated what is the change in internal energy of water?
  1.    10 J
  2.    25 J
  3.    35 J
  4.    50 J
 Discuss Question
Answer: Option A. -> 10 J
Answer: (a).10 J
Question 43. 10 Kg of water is pumped to a height of 2 m, the enthalpy is changed by 15 J/Kg, and work done by the motor is 50 J/Kg, assuming system is insulated what is the change in internal energy of water?
  1.    50 J
  2.    100 J
  3.    150 J
  4.    200 J
 Discuss Question
Answer: Option C. -> 150 J
Answer: (c).150 J
Question 44. 1 Kg of water is pumped to a height of 10 m, the enthalpy is changed by 50 J/Kg, and work done by the motor is 300 J/Kg, assuming system is insulated what is the change in internal energy of water?
  1.    100 J
  2.    150 J
  3.    200 J
  4.    300 J
 Discuss Question
Answer: Option B. -> 150 J
Answer: (b).150 J
Question 45. 5 Kg of water is pumped to a height of 5 m, the enthalpy is changed by 10 J/Kg, and work done by the motor is 100 J/Kg, assuming system is insulated what is the change in internal energy of water?
  1.    50 J
  2.    100 J
  3.    150 J
  4.    200 J
 Discuss Question
Answer: Option D. -> 200 J
Answer: (d).200 J
Question 46. 2 Kg of water (CP = 0.15 J/Kg°C) is pumped to a height of 0.1 m, work done by the motor is 10 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 27°C?
  1.    10°C
  2.    19°C
  3.    27°C
  4.    37°C
 Discuss Question
Answer: Option D. -> 37°C
Answer: (d).37°C
Question 47. 5 Kg of water (CP = 1 J/Kg°C) is pumped to a height of 0.5 m, work done by the motor is 50 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 0°C?
  1.    2°C
  2.    4°C
  3.    6°C
  4.    8°C
 Discuss Question
Answer: Option C. -> 6°C
Answer: (c).6°C
Question 48. 1 Kg of water (CP = 0.4 J/Kg°C) is pumped to a height of 2 m, work done by the motor is 50 J/Kg, and heat liberated by it is 10 J/Kg, what is the final temperature of water if the initial temperature was 25°C?
  1.    25°C
  2.    45°C
  3.    60°C
  4.    75°C
 Discuss Question
Answer: Option D. -> 75°C
Answer: (d).75°C
Question 49. 1 Kg of water (CP = 0.5 J/Kg°C) is pumped to a height of 1 m, work done by the motor is 20 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 20°C?
  1.    20°C
  2.    30°C
  3.    40°C
  4.    50°C
 Discuss Question
Answer: Option B. -> 30°C
Answer: (b).30°C
Question 50. 1 Kg of water (CP = 0.5 J/Kg°C) is pumped to a height of 0.5 m, work done by the motor is 40 J/Kg, and heat liberated by it is 10 J/Kg, what is the final temperature of water if the initial temperature was 10°C?
  1.    10°C
  2.    30°C
  3.    40°C
  4.    60°C
 Discuss Question
Answer: Option D. -> 60°C
Answer: (d).60°C

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