1
GATE ME 2005
MCQ (Single Correct Answer)
+1
-0.3
The following four figures have been drawn to represent a fictitious thermodynamic cycle, on the $$P$$-$$v$$ and $$T$$-$$S$$ plates GATE ME 2005 Thermodynamics - Second Law of Thermodynamics Question 17 English 1 GATE ME 2005 Thermodynamics - Second Law of Thermodynamics Question 17 English 2

According to the first law of thermodynamics, equal areas are enclosed by

A
figures $$1$$ and $$2$$
B
figures $$1$$ and $$3$$
C
Figures $$1$$ and $$4$$
D
figures $$2$$ and $$3$$
2
GATE ME 2003
MCQ (Single Correct Answer)
+1
-0.3
An industrial heat pump operates between the temperatures of $${27^ \circ }C$$ and $$ - {13^ \circ }C.$$ The rates of heat addition and heat rejection are $$750$$ $$W$$ and $$1000$$ $$W,$$ respectively. The $$COP$$ for the heat pump is
A
$$7.5$$
B
$$6.5$$
C
$$4.0$$
D
$$3.0$$
3
GATE ME 1995
MCQ (Single Correct Answer)
+1
-0.3
Consider a refrigerator and a heat pump working on the reversed Carnot cycle between the same temperature limits. Which of the following is correct?
A
$$COP$$ refrigerator $$= COP$$ of heat pump
B
$$COP$$ of refrigerator $$= COP$$ of heat pump $$+ 1$$
C
$$COP$$ of refrigerator $$= COP$$ of heat pump $$- 1$$
D
$$COP$$ of refrigerator $$=$$ inverse $$COP$$ of heat pump
4
GATE ME 1995
Fill in the Blanks
+1
-0
In the case of a refrigeration system undergoing an irreversible cycle, $$\oint {{{SQ} \over T}} $$ is _____________$$\left( { < 0/ = 0/ > 0} \right)$$
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