1
AIEEE 2007
+4
-1
Out of Syllabus
A Carnot engine, having an efficiency of $$\eta = 1/10$$ as heat engine, is used as a refrigerator . If the work done on the system is $$10$$ $$J$$, the amount of energy absorbed from the reservoir at lower temperature is
A
$$100$$ $$J$$
B
$$99$$ $$J$$
C
$$90$$ $$J$$
D
$$1$$ $$J$$
2
AIEEE 2007
+4
-1
If $${C_p}$$ and $${C_v}$$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
A
$${C_p} - {C_v} = 28R$$
B
$${C_p} - {C_v} = R/28$$
C
$${C_p} - {C_v} = R/14$$
D
$${C_p} - {C_v} = R$$
3
AIEEE 2007
+4
-1
When a system is taken from state $$i$$ to state $$f$$ along the path iaf, it is found that $$Q=50$$ cal and $$W=20$$ $$cal$$. Along the path $$ibf$$ $$Q=36$$ $$cal.$$ $$W$$ along the path $$ibf$$ is
A
$$14$$ $$cal$$
B
$$6$$ $$cal$$
C
$$16$$ $$cal$$
D
$$66$$ $$cal$$
4
AIEEE 2007
+4
-1
One end of a thermally insulated rod is kept at a temperature $${T_1}$$ and the other at $${T_2}$$. The rod is composed of two sections of length $${L_1}$$ and $${L_2}$$ and thermal conductivities $${K_1}$$ and $${K_2}$$ respectively. The temperature at the interface of the two section is
A
$${{\left( {{K_1}{L_1}{T_1} + {K_2}{L_2}{T_2}} \right)} \over {\left( {{K_1}{L_1} + {K_2}{L_2}} \right)}}$$
B
$${{\left( {{K_2}{L_2}{T_1} + {K_1}{L_1}{T_2}} \right)} \over {\left( {{K_1}{L_1} + {K_2}{L_2}} \right)}}$$
C
$${{\left( {{K_2}{L_1}{T_1} + {K_1}{L_2}{T_2}} \right)} \over {\left( {{K_2}{L_1} + {K_1}{L_2}} \right)}}$$
D
$${{\left( {{K_1}{L_2}{T_1} + {K_2}{L_1}{T_2}} \right)} \over {\left( {{K_1}{L_2} + {K_2}{L_1}} \right)}}$$
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