ME 200 Exam 1 Questions With All Correct &
Verified Answers
For a substance near saturation dome (on either side of it/under it), phase can always be determined
knowing pressure and temperature. (True or False) Correct answer-False
For a substance near saturation dome (on either side of it/under it), phase can always be determined
knowing pressure and specific volume. (True or False) Correct answer-True
At critical point, the specific internal energy of saturated liquid is equal to specific internal energy of
saturated vapor. (True or False) Correct answer-True
A constant mass system, having negligible changes in KE and PE, is supplied with 20 kJ of work and
heat transfer of 50 kJ occurs from the system to surroundings. Does the energy of the system
(Decrease or Increase or Remain the same)? Correct answer-Energy Decreases
A closed, rigid tank contains a saturated liquid-vapor mixture (V < Vcritical). When the tank is heated
to a pressure below critical pressure, the possible final phase(s) is/are (Saturated liquid-vapor
mixture, Saturated liquid, Saturated vapor, Compressed liquid, Superheated vapor). Correct
answer-Saturated liquid-vapor mixture, Saturated liquid, or Compressed liquid
Consider a lightbulb powered by electricity. Assume positive sign for heat transfer into the system
and for work output from the system. which of the following is true considering lightbulb as the
system?
W > 0, Q > 0
W > 0, Q < 0
W < 0, Q < 0
W < 0, Q > 0 Correct answer-W < 0, Q < 0
Which of the following is (are) true for a fixed state containing only vapor?
T < Tsat
T > Tsat
P < Psat
P > Psat Correct answer-T > Tsat
P < Psat
What is the quality for a saturated liquid-vapor mixture? Correct answer-Ratio of mass occupied by
vapor phase to total mass of the mixture.
A steel ball at 300C is initially held stationary 100 m above the ground. The ball is then released, and
the ball accelerates and cools during its fall to the ground. Assume air friction to be negligible. When
is the total energy of the ball highest? Correct answer-The instant it is released.
Which of the following is (are) not true for change in specific internal energy during a process with
initial and final states having only liquid?
dU = U2(P2,T2) - U1(P1,T1)
dU = Uf(P2) - Uf(P1)
dU = C(T2 - T1)
dU = Uf(T2) - Uf(T1) Correct answer-dU = Uf(P2) - Uf(P1)
Verified Answers
For a substance near saturation dome (on either side of it/under it), phase can always be determined
knowing pressure and temperature. (True or False) Correct answer-False
For a substance near saturation dome (on either side of it/under it), phase can always be determined
knowing pressure and specific volume. (True or False) Correct answer-True
At critical point, the specific internal energy of saturated liquid is equal to specific internal energy of
saturated vapor. (True or False) Correct answer-True
A constant mass system, having negligible changes in KE and PE, is supplied with 20 kJ of work and
heat transfer of 50 kJ occurs from the system to surroundings. Does the energy of the system
(Decrease or Increase or Remain the same)? Correct answer-Energy Decreases
A closed, rigid tank contains a saturated liquid-vapor mixture (V < Vcritical). When the tank is heated
to a pressure below critical pressure, the possible final phase(s) is/are (Saturated liquid-vapor
mixture, Saturated liquid, Saturated vapor, Compressed liquid, Superheated vapor). Correct
answer-Saturated liquid-vapor mixture, Saturated liquid, or Compressed liquid
Consider a lightbulb powered by electricity. Assume positive sign for heat transfer into the system
and for work output from the system. which of the following is true considering lightbulb as the
system?
W > 0, Q > 0
W > 0, Q < 0
W < 0, Q < 0
W < 0, Q > 0 Correct answer-W < 0, Q < 0
Which of the following is (are) true for a fixed state containing only vapor?
T < Tsat
T > Tsat
P < Psat
P > Psat Correct answer-T > Tsat
P < Psat
What is the quality for a saturated liquid-vapor mixture? Correct answer-Ratio of mass occupied by
vapor phase to total mass of the mixture.
A steel ball at 300C is initially held stationary 100 m above the ground. The ball is then released, and
the ball accelerates and cools during its fall to the ground. Assume air friction to be negligible. When
is the total energy of the ball highest? Correct answer-The instant it is released.
Which of the following is (are) not true for change in specific internal energy during a process with
initial and final states having only liquid?
dU = U2(P2,T2) - U1(P1,T1)
dU = Uf(P2) - Uf(P1)
dU = C(T2 - T1)
dU = Uf(T2) - Uf(T1) Correct answer-dU = Uf(P2) - Uf(P1)
