Chemical Process Calculation Questions and Answer

Heat

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Heating always results in an increase in temperature. The statement is
Correct
Incorrect
Always correct
None of the mentioned
Explanation:
Heating always does not result in an increase in temperature.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
If Q = 45 W and The values of U and A are 10 and 2.5 with their respective SI units. What is the temperature difference between system and surrounding?
1.8 Degree Celsius
1.8 Degree Fahrenheit
1.8 Degree Rankine
None of the mentioned
Explanation:
T2-T1 = 1.8 Degree Celsius, Q = UA(T2-T1).
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Heat can travel only
Upwards
Downwards
Upwards and Downwards
None of the mentioned
Explanation:
It is not mandatory to travel in only in upward an downward direction.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
A cold body contains no heat. The statement is
Correct
Incorrect
Always correct
None of the mentioned
Explanation:
Heat can be contained by a cold body.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Heat transfer can occur by
Conduction
Convection
Radiation
All of the mentioned
Explanation:
Conduction, Convection and Radiation are the usually as the three categories of heat transfer.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Two state are given as following
Both I and II are correct
Both I and II are incorrect
Only I is correct
Only II is correct
Explanation:
Heat is not a substance and It is not mandatory for heat to be proportional to temperature.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
When Q = 0, there is possibility that
Temperature of system and surrounding are same
System is an adiabatic system
Both a and b
Neither a nor b
Explanation:
For Q = 0, System may be insulated or there is no temperature difference.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
When Heat is gained by the system
Q < 0
Q > 0
Q = 0
None of the mentioned
Explanation:
Heat transferred from the surrounding, T2-T1> 0 so Q > 0.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Q = 45 means
Heat is transferred from the system
Heat is transferred from surrounding
Heat is gained by the surrounding
None of the mentioned
Explanation:
Q > 0,Heat is gained by the system and transferred from the surrounding.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Q = UA(T2-T1); A formula for heat transfer is given
Heat is transferred from system
Heat is transferred from surrounding
Heat is gained by system
None of the mentioned
Explanation:
Q < 0, means T2-T1 < 0; Heat is transferred from system.