Practice Pakistan's most useful MCQs for competitive exams

Cpμ/K is termed as the ______________ number?

• (A)  Grashoff
• (B)  Nusselt
• (C)  Prandtl
• (D)  Stanton

Answer

Submitted By :Ali Uppal

A black body does not ____________ radiation?

• (A)  Absorb or emit
• (B)  Refract
• (C)  Reflect
• (D)  Both

Answer

Submitted By :Ali Uppal

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a_________________?

• (A)  Boiler
• (B)  Heat exchanger
• (C)  Recuperator
• (D)  Regenerator

Answer

Submitted By :Ali Uppal

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is__________________?

• (A)  0.4
• (B)  0.5
• (C)  0.6
• (D)  0.7

Answer

Submitted By :Ali Uppal

Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around ______________ BTU?

• (A)  180
• (B)  970
• (C)  3.97
• (D)  Data insufficient, can’t be predicted

Answer

Submitted By :Ali Uppal

Stefan’s block body radiation law can also be derived from ______________ law?

• (A)  Kirchoff’s
• (B)  Planck’s
• (C)  Fourier’s
• (D)  None of these

Answer

Submitted By :Ali Uppal

What is the geometric mean of two heat transfer areas A1 and A2 ?

• (A)  √(A1 . A2)
• (B)  √(A1 + A2)
• (C)  ½ √(A1 . A2)
• (D)  2 √(A1 . A2)

Answer

Submitted By :Ali Uppal

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?

• (A)  2
• (B)  1/2
• (C)  4
• (D)  1/4

Answer

Submitted By :Ali Uppal

Which has the lowest Prandtl number ?

• (A)  Liquid metal
• (B)  Aqueous solution
• (C)  Water
• (D)  Lube oil

Answer

Submitted By :Ali Uppal

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________?

• (A)  Linear
• (B)  Hyperbolic
• (C)  Parabolic
• (D)  None of these

Answer

Submitted By :Ali Uppal