This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Energy Balances – Heat”.
1. Heat transfer can occur by
a) Conduction
b) Convection
c) Radiation
d) All of the mentioned
View Answer
Explanation: Conduction, Convection and Radiation are the usually as the three categories of heat transfer.
2. Two state are given as following
I: Heat is a substance
II: Heat is proportional to temperature
a) Both I and II are correct
b) Both I and II are incorrect
c) Only I is correct
d) Only II is correct
View Answer
Explanation: Heat is not a substance and It is not mandatory for heat to be proportional to temperature.
3. Heating always results in an increase in temperature. The statement is
a) Correct
b) Incorrect
c) Always correct
d) None of the mentioned
View Answer
Explanation: Heating always does not result in an increase in temperature.
4. When the rate of heat transfer (Q) is negative (Q < 0), what does it indicate?
a) Heat is transferred from system
b) Heat is transferred from surrounding
c) Heat is gained by system
d) None of the mentioned
View Answer
Explanation: Q < 0, means T2-T1 < 0; Heat is transferred from system.
5. What does it mean when heat is gained by the system?
a) Q < 0
b) Q > 0
c) Q = 0
d) None of the mentioned
View Answer
Explanation: Heat transferred from the surrounding, T2-T1> 0 so Q > 0.
6. When Q = 0, which of the following is possible?
a) Temperature of system and surrounding are same
b) System is an adiabatic system
c) Both a and b
d) Neither a nor b
View Answer
Explanation: For Q = 0, System may be insulated or there is no temperature difference.
7. If the rate of heat transfer (Q) is 45 W, and the values of U and A are 10 and 2.5, respectively, what is the temperature difference between the system and the surrounding?
a) 1.8 Degree Celsius
b) 1.8 Degree Fahrenheit
c) 1.8 Degree Rankine
d) None of the mentioned
View Answer
Explanation: T2-T1 = 1.8 Degree Celsius, Q = UA(T2-T1).
8. If Q = 45 W, what does this indicate?
a) Heat is transferred from the system
b) Heat is transferred from surrounding
c) Heat is gained by the surrounding
d) None of the mentioned
View Answer
Explanation: Q > 0,Heat is gained by the system and transferred from the surrounding.
9. A cold body contains no heat. The statement is
a) Correct
b) Incorrect
c) Always correct
d) None of the mentioned
View Answer
Explanation: Heat can be contained by a cold body.
10. Heat can travel only
a) Upwards
b) Downwards
c) Upwards and Downwards
d) None of the mentioned
View Answer
Explanation: It is not mandatory to travel in only in upward an downward direction.
Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.
