Practice Pakistan's most useful MCQs for competitive exams

Baffle spacing is generally _________________ the I.D. of the shell ?

• (A)  More than
• (B)  Not greater than
• (C)  Not less than one fifth of
• (D)  Both

Answer

Submitted By :Ali Uppal

In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?

• (A)  4(P2 – πd2/4)/πd
• (B)  (P2 – rd2/4)/rd
• (C)  4P2/πd
• (D)  πd/4P2

Answer

Submitted By :Ali Uppal

For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following?

• (A)  Sieve
• (B)  Valve
• (C)  Counter flow
• (D)  Bubble cap

Answer

Submitted By :Ali Uppal

Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?

• (A)  Same
• (B)  Less
• (C)  About 3 times
• (D)  About 0.33 times

Answer

Submitted By :Ali Uppal

Wind load consideration in the design of a support can be neglected, when the vessel is___________________?

• (A)  Tall (say 30 metres), but is full of liquid
• (B)  Tall but empty
• (C)  Short (< 2 m) and housed indoor
• (D)  None of these

Answer

Submitted By :Ali Uppal

Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?

• (A)  5-10
• (B)  15-20
• (C)  30-35
• (D)  35-40

Answer

Submitted By :Ali Uppal

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _____________ stress?

• (A)  Yield point
• (B)  Breaking
• (C)  Ultimate
• (D)  None of these

Answer

Submitted By :Ali Uppal

A/an _______________ is used for changing the direction of a pipeline?

• (A)  Elbow
• (B)  Union
• (C)  Flange
• (D)  Disc compensator

Answer

Submitted By :Ali Uppal

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?

• (A)  Same as that for fluid flow
• (B)  Less than that for fluid flow
• (C)  More than that for fluid flow
• (D)  D2 – D1 (D1 and D2 are I.

Answer

Submitted By :Ali Uppal

At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?

• (A)  Increases
• (B)  Decreases
• (C)  Remain same
• (D)  May increase or decrease depending upon the solubility of the gas in the liquid

Answer

Submitted By :Ali Uppal