Process Equipment and Plant Design MCQs

Sensible heat changes for vapour & liquid are negligibly small.

Reflux is not a saturated liquid.

Molar latent heat of the two components are equal.

Heat of mixing of normal liquid is assumed to be zero.

practical limit reached, due to low heat transfer rate because of inadequate temperature difference.

economic limit reached, when the plant cost exceeds the saving of steam.

both (a) & (b).

neither (a) nor (b).

is always less than arithmetic average value.

is always more than arithmetic mean value and the geometric mean value.

is always less than arithmetic mean value, but more than geometric mean value.

may be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current.

rivets

a hold down bar

bolts

both (b) and (c)

clearance of 25-75 mm.

cap pitch of 1.3-2 times the cap diameter.

either ‘a’ or ‘b’.

neither ‘a’ nor ‘b’.

need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.

for carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm.

for internal cover and tube sheet is provided on both the sides.

all (a), (b) & (c).

0.5″ -1.25″.

2″-3.5″.

5″.

half the tray spacing.

Segmental baffle

Flat plate extending across the wall

Disk type baffle

Helical type baffle

1/10th

1/20th

1/30th

1/50th

0.5 to 1

1 to 1.5

1.5 to 2

2 to 2.5