A heat engine operates between a high temperature reservoir at TH and a low temperature reservoir at TL. Its efficiency is given by 1 ? TL/TH :
A. only if the working substance is an ideal gas
B. only if the engine is reversible
C. only if the engine is quasi-static
D. only if the engine operates on a Stirling cycle
E. no matter what characteristics the engine has
Answer: B. only if the engine is reversible
You might also like to view...
Which of the following is true of the star clusters in the Milky Way?
A) Open clusters are widely scattered in the Milky Way. B) Globular clusters are concentrated along the disk of the Milky Way. C) Open clusters are more common toward the constellation Sagittarius. D) Globular clusters are much too far away to have measureable parallaxes.
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
?
?
Use this exhibit to answer the following question(s).
Refer to . A point or points at which the object has positive velocity and zero acceleration is(are)
a.
B
b.
C
c.
D
d.
B and D
e.
A and E
A bird sitting on a bare high voltage wire is not electrocuted because
a. of the high resistance of its body b. there is no electrical potential difference across its body c. its body is at a low electrical potential compared to the wire d. the high voltage across its feet produced a small current
During which of the following processes is latent heat released?
What will be an ideal response?