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1.

Consider the following statements:
1. Mass transfer refers to mass in transit due to a species concentration gradient in a mixture.
2. Must have a mixture of two or more species for mass transfer to occur.
3. The species concentration gradient is the driving potential for mass transfer.
4. Mass transfer by diffusion is analogous to heat transfer by conduction.
Which of the above statements are correct?
(a) 1, 2 and 3
(b) 1, 2 and 4
(c) 2, 3 and 4
(d) 1,2, 3 and 4

asked in Mechanical Paper-1, 2009

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2.

Assertion (A): Lumped capacity analysis of unsteady heat conduction assumes a constant uniform temperature throughout a solid body.
Reason (R): The surface convection resistance is very large compared with the internal conduction resistance.
Which of the following statements is correct?
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d)A is false but R is true

asked in Mechanical Paper-1, 2010

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3.

Upto the critical radius of insulation
(a) convection heat loss will be less than conduction heat loss
(b) heat flux will decrease
(c) added insulation will increase heat loss
(d) added insulation will decrease heat loss

asked in Mechanical Paper-1, 2010

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4.

In MLTθ system (T being time and θ temperature), what is the dimension of thermal conductivity?
a. ML^-1T^-1θ^-3
b. MLT^-1θ^-1
c. MLT^-3θ^-1
d. ML^-1T^-2θ^-1

asked in Mechanical Paper-1, 2009

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5.

A steel plate of thermal conductivity 50 W/m-K and thickness 10 cm passes a heat flux by conduction of 25 kW/m². If the temperature of the hot surface of the plate is 100°C, then what is the temperature of the cooler side of the plate?
a. 30°C
b. 40°C
c. 50°C
d. 60°C

asked in Mechanical Paper-1, 2009

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6.

A composite slab has two layers of different materials having internal conductivities K₁ and K₂.If each layer has the same thickness, then what is the equivalent thermal conductivity of the slab?
a. K₁K₂/(K₁+K₂)
b. K₁K₂/[2(K₁+K₂)]
c. 2K₁/(K₁+K₂)
d. 2K₁K₂/(K₁+K₂)

asked in Mechanical Paper-1, 2009

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