1
GATE ME 1999
+2
-0.6
It is proposed to coat a $$1mm$$ diameter wire with enamel paint $$\left( {k\,\,\,\, = 0.1W/m} \right.$$ - $$\left. K \right)$$ to increase heat transfer with air. If the air side heat transfer co-efficiency is $$100$$ $$W/{m^2}K,$$ the optimum thickness of enamel paint should be
A
$$0.25$$ $$mm$$
B
$$0.5$$ $$mm$$
C
$$1$$ $$mm$$
D
$$2$$ $$mm$$
2
GATE ME 1998
+2
-0.6
The temp variation under steady heat conduction across a composite slab of two materials with thermal conductivies $${K_1}$$ and $${K_2}$$ is shown in fig. then, which one of the following statements holds?
A
$${K_1} > {K_2}$$
B
$${K_1} = {K_2}$$
C
$${K_1} = 0$$
D
$${K_1} < {K_2}$$
3
GATE ME 1996
+2
-0.6
For a current carrying wire of $$20$$ $$mm$$ diameter and having $$k=0.5W/mK$$ is exposed to air $$\left( {h = 20W/{m^2}K} \right),$$ maximum heat dissiption occurs when thickness of insulation is
A
$$30$$ $$mm$$
B
$$25$$ $$mm$$
C
$$20$$ $$mm$$
D
$$15$$ $$mm$$
4
GATE ME 1991
Subjective
+2
-0
Match the property with their units

Property
$$A.$$ Bulk modulus
$$B.$$ Thermal conductivity
$$C.$$ Heat transfer coefficient
$$D.$$ Heart flow rate

Units
$$1.$$ $$W/s$$
$$2.$$ $$N/{m^2}$$
$$3.$$ $$N/{m^3}$$
$$4.$$ $$W$$
$$5.$$ $$W/mK$$
$$6.$$ $$W/{m^2}K$$

GATE ME Subjects
EXAM MAP
Medical
NEET