Chemical Engineering Basics MCQs

Question 1

Out of the following, which will fracture most readity, when hit with a hard hammer ?

Accepted Answer

Cast iron

Answer

Brass

Answer

Bronze

Answer

German silver

Question 2

Dezincification is a form of corrosion, which specifically applies to

Accepted Answer

Brass

Answer

Steel

Answer

Stainless steel

Answer

Babbit metal

Question 3

Oxyacetylene reducing flame is used while carrying out welding on

Accepted Answer

Mild steel

Answer

Alloy steel

Answer

Grey cast iron

Answer

High carbon steel

Question 4

Oxyacetylene reducing flame is used while carrying out welding on

Accepted Answer

Mild steel

Answer

Alloy steel

Answer

Grey cast iron

Answer

High carbon steel

Question 5

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

Accepted Answer

$${2^{\frac{3}{2}}}$$

Answer

$${2^3}$$

Answer

$${2^{\frac{5}{2}}}$$

Answer

$${2^{\frac{1}{3}}}$$

Question 6

Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

Accepted Answer

1:1

Answer

1:2

Answer

2:1

Answer

1:4

Question 7

__________ of air does not increase with increase in temperature.

Accepted Answer

Density

Answer

Thermal diffusivity

Answer

Viscosity

Answer

Thermal conductivity

Question 8

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

Accepted Answer

Re0.8, Re0.5

Answer

Re0.5, Re0.8

Answer

Re0.8, Re-0.5

Answer

Re-0.8, Re0.5

Question 9

Oxygen cylinders used for autogenous (cutting/welding) purposes are

Accepted Answer

Seamless & made of steel

Answer

Heat treated before use

Answer

Made by sand casting

Answer

Welded steel cylinders