Practice Pakistan's most useful MCQs for competitive exams

____________________ strain is measured using a ‘strain rosetter’ ?

• (A)  Volumetric
• (B)  Shear
• (C)  Linear
• (D)  None of these

Answer

Submitted By :Ali Uppal

The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches?

• (A)  6
• (B)  12
• (C)  18
• (D)  36

Answer

Submitted By :Ali Uppal

_______________ shaped roof is most commonly used for cylindrical tanks ?

• (A)  Cone
• (B)  Dome
• (C)  Umbrella
• (D)  Flat

Answer

Submitted By :Ali Uppal

(Le/D) for fully open gate valves would be __________________?

• (A)  Much more than that for fully open globe valves
• (B)  Much less (say 2% than that for fully open globe valves)
• (C)  Around 7
• (D)  Both

Answer

Submitted By :Ali Uppal

Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?

• (A)  Relative volatility is close to one (e.g., separation of close boiling isomers)
• (B)  Feed is not at its bubble point
• (C)  Number of equilibrium stages in only stripping section is to be calculated
• (D)  Number of equilibrium stages required is likely to be very small

Answer

Submitted By :Ali Uppal

In actual operation of a bubble cap distillation tower, the ______________ at the bottom of the tower is more than that at the top of the tower?

• (A)  Molal flow rate of vapour
• (B)  Vapour molecular weight
• (C)  Pressure and temperature
• (D)  All

Answer

Submitted By :Ali Uppal

In a ______________ riveted joint, the rivets in the various rows are opposite to each other?

• (A)  Zig-zag
• (B)  Chain
• (C)  Diamond
• (D)  None of these

Answer

Submitted By :Ali Uppal

Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?

• (A)  η = 17 – 61.1 log μ
• (B)  η = 24.6 (Δp/μ)
• (C)  η = 1.66 – 0.25 log μ
• (D)  η = 0.25 log μ – 1.67

Answer

Submitted By :Ali Uppal

Thickness of the frame of a plate and frame filter as compared to that of plates is___________________?

• (A)  Less
• (B)  Same
• (C)  More
• (D)  Either

Answer

Submitted By :Ali Uppal

Lap joints are preferred for plates having thickness _______________ mm?

• (A)  < 12.5
• (B)  > 3
• (C)  > 5
• (D)  5-10

Answer

Submitted By :Ali Uppal