ME 200 Exam 1 questions and answers 2025

ME 200 EXAM 1 QUESTIONS AND ANSWERS
2025
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