1. What is the maximum efficiency possible for a heat engine operating while con
ID: 2127974 • Letter: 1
Question
1. What is the maximum efficiency possible for a heat engine operating while connected to a cold reservoir at 400K and a hot reservoir of 600K?
0%
16%
33%
50%
67%
75%
100%
2. Which of the following is true for the adiabatic expansion of a gas?
pressure is constant
pressure increases
pressure decreases
3. One of the assumptions made about the molecules in an ideal gas is
the molecules do not interact
the molecules interact only through very short range forces
the molecules can interact over long range forces only
4. The cross sectional area of the pipe is A1 at the entrance and A2 at the exit. If a fluid enters the pipe with a speed v1, the velocity v2 at the exit will be,
a.
All the given answers are wrong
b.
v1 = v2
c.
v1 > v2
d.
It cannot be determined from the given information
e.
v1 > v2
5. Which of the following represents the heat (Q) for a substance going from its gas or vapor phase to its solid phase (deposition or frost)?
m Lf
-m Lf
m Ls
-m Ls
m Lv
-m Lv
0%
16%
33%
50%
67%
75%
100%
Explanation / Answer
efficiency, n = 1 - 400/600 = 33%
2.) pressure decreases
3.) molecules do not interact
4.) It cannot be determined from the given information
5.) -m Ls
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