CPT CPT Heat Transfer & Thermodynamics

Question 1

Which mode of heat transfer occurs through direct contact between two solid objects?

Accepted Answer

Conduction

Answer

Conduction transfers heat through direct molecular contact within or between solid materials without bulk movement of matter.

Question 2

What is the purpose of a heat exchanger in an industrial process system?

Accepted Answer

Transfer thermal energy between two fluid streams without mixing them

Answer

A heat exchanger allows heat to flow from a hotter fluid to a cooler fluid through a separating wall, controlling process temperatures without the fluids contacting each other.

Question 3

In a shell-and-tube heat exchanger, which fluid typically flows through the tubes?

Accepted Answer

The fluid requiring more pressure containment or that is more corrosive

Answer

The tube-side fluid is selected when it requires higher pressure containment, is corrosive (limiting corrosion to tubes rather than the entire shell), or needs easier cleaning access.

Question 4

What does the term 'LMTD' represent in heat exchanger calculations?

Accepted Answer

Log Mean Temperature Difference

Answer

LMTD (Log Mean Temperature Difference) is the logarithmic average of temperature differences between hot and cold streams at each end, used to calculate heat exchanger duty.

Question 5

A process fluid temperature rises from 60°F to 160°F. What is the temperature rise in degrees Celsius?

Accepted Answer

55.6°C

Answer

A 100°F rise equals 100 × 5/9 = 55.6°C rise (temperature differences convert at 5/9 ratio, not using the offset formula).

(CPT) Certified Process Technician Practice Test

(CPT) Certified Process Technician Practice Test

CPT CPT Heat Transfer & Thermodynamics