EASA Part 66 – Physics Module Questions with Verified Answers (Thermodynamics, Heat Transfer, Gas Laws)

EASA Part 66: Physics Questions with verified
answers
Question Number. 1. For a heat pump to internally heat it uses a.
Option A. inside evaporator.
Option B. inside condenser.
Option C. outside condenser. Ans✓✓✓ Correct Answer is. inside
condenser.
Explanation. NIL. http://en.wikipedia.org/wiki/Heat_pump


Question Number. 2. The heat required to change a liquid to a gas is
called the heat of.
Option A. condensation.
Option B. fusion.
Option C. vapourisation. Ans✓✓✓ Correct Answer is. vapourisation.
Explanation. Liquid to gas is vapourisation. Solid to liquid is fusion
(another term for melting - like fusion welding).


Question Number. 3. What is the SI units for specific heat capacity?.
Option A. Jkg-1k-1.
Option B. J/S/C.
Option C. J/ kg. Ans✓✓✓ Correct Answer is. Jkg-1k-1.


Question Number. 4. The most common refrigerants are.

,Option A. water, ammonia, freon.
Option B. water, freon, carbon dioxide.
Option C. ammonia, freon, methyl bromide. Ans✓✓✓ Correct Answer
is. water, ammonia, freon.
Explanation. All are refrigerants - water is used in cooling towers.
Methyl bromide is almost completely phased out due to safety and
environmental reasons. Carbon dioxide has been used but no more due
to availability of better refrigerants such as ammonia.


Question Number. 5. How is heat transferred in a vacuum?.
Option A. Convection.
Option B. Conduction.
Option C. Radiation. Ans✓✓✓ Correct Answer is. Radiation.


Question Number. 6. The specific heat capacity of a gas heated at
constant pressure, when compared to the specific heat capacity of a
gas heated at constant volume, is.
Option A. more.
Option B. less.
Option C. the same. Ans✓✓✓ Correct Answer is. more.
Explanation. Cp is slightly higher than Cv. Usually it only applies to
gases. For example the Cp for air is 1.4 times more than its Cv.


Question Number. 7. Adiabatic compression is when.

, Option A. no heat is lost or gained.
Option B. kinetic energy is gained.
Option C. heat is given off to the surroundings. Ans✓✓✓ Correct
Answer is. no heat is lost or gained.


Question Number. 8. The heat required to change a solid to a liquid is
called the heat of.
Option A. vapourisation.
Option B. condensation.
Option C. fusion. Ans✓✓✓ Correct Answer is. fusion.
Explanation. Another word for melting is 'fusion' (as in fusion welding -
or... 'a fuse').


Question Number. 9. Latent heat is the.
Option A. heat required to raise the temperature of a body by 1 °C.
Option B. heat required to raise 1kg of matter by 1K.
Option C. heat required to change the state of a body. Ans✓✓✓
Correct Answer is. heat required to change the state of a body.
Explanation. Latent' means 'hidden'. It is the heat energy required to
change the state (melt or vapourise). No rise in temperature is
pruduced whilst doing so - hence the 'hidden' bit.


Question Number. 10. The intensity of radiated heat is.