301 Quiz_3_Solution

301 Quiz_3_Solution - True ______ False ___X___ 4. (20...

This preview shows page 1. Sign up to view the full content.

SOLUTIONS 1 MAE 301: Engineering Thermodynamics I Spring 2010 Quiz 3 April 8, 2010 (Total 100 points, closed books and closed notes) 1. (20 points). The efficiency of a reversible heat engine operating between two temperature reservoirs is maximized when: (a) 1 H L T T (b) 0 H L T T 2. (20 points). Select a correct relation for an irreversible heat engine cycle operating between two temperature reservoirs: (a) 0 > L L H H T Q T Q (b) 0 = L L H H T Q T Q (c) 0 < L L H H T Q T Q 3. (20 points). The COP of an irreversible refrigeration cycle is always less than the COP of a reversible refrigeration cycle.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: True ______ False ___X___ 4. (20 points). The efficiency of a reversible heat engine operating between two thermal reservoirs is equal to 40%. The efficiency will be doubled when: (a) T H is increased 2 times (b) T L is reduced 3 times (c) T H is increased 5 times (d) none of the above 5. (20 points). The COP of a reversible heat pump operating between two thermal reservoirs is equal to 4. What is the efficiency of a reversible heat engine operating between the same temperature reservoirs? ________ 25 . ____ = HE...
View Full Document

This note was uploaded on 05/19/2010 for the course MAE 301 taught by Professor Hassan during the Spring '08 term at N.C. State.

Ask a homework question - tutors are online