Chemical Engineering Basics MCQs

Question 1

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is

Accepted Answer

Very low which prevents their ignition by compression

Answer

Very high which prevents their ignition by compression

Answer

Zero

Answer

None of these

Question 2

During brazing, if the fluxes are entrapped, it results in the

Accepted Answer

Corrosion

Answer

Distortion of brazed joints

Answer

Cracking of joints

Answer

Presence of gas pockets

Question 3

Which of the following is a disaccharide?

Accepted Answer

Lactose

Answer

Starch

Answer

Cellulose

Answer

Fructose

Question 4

Which one of the following is incombustible?

Accepted Answer

CCl4

Answer

H2

Answer

C2H2

Answer

S

Question 5

The entropy change for a spontaneous process is

Accepted Answer

< 0 for the system & the surrounding

Answer

> 0 for the system

Answer

< 0 for the system

Answer

> 0 for the system & the surrounding

Question 6

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

Accepted Answer

1127

Answer

768

Answer

1359

Answer

1480

Question 7

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

Accepted Answer

Both A & B

Answer

Providing support for the tubes

Answer

Improving heat transfer

Answer

Preventing the fouling of tubes & stagnation of shell side fluid

Question 8

Iron content in Indian iron ore is about __________ percent.

Accepted Answer

60-65

Answer

80-85

Answer

40-45

Answer

20-25

Question 9

Suitability of steel for its use in cable is judged by its strength in

Accepted Answer

Tension

Answer

Compression

Answer

Torsion

Answer

Shear