Chemical Engineering Basics MCQs

Question 1

In fluid flow and heat & mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are

Accepted Answer

α and θ have units of m 2 /s, while μ has unit of m/s

Answer

μ, α and θ all have units of m/s

Answer

μ, α and θ all have units of m 2 /s

Answer

α and θ have units of m/s, while μ has unit of m 2 /s

Question 2

The critical pressure at which the latent heat of vaporization of steam becomes zero is __________ Kg/cm 2 .

Accepted Answer

225.65

Answer

273.15

Answer

100.03

Answer

373.15

Question 3

Ganister contains maximum percentage of

Accepted Answer

SiO 2

Answer

FeO

Answer

MgO

Answer

MnO 2

Question 4

Tip of the match stick contains a mixture of

Accepted Answer

S + K 2 Cr 2 O 7 + White P

Answer

K + S

Answer

K + S + K 2 Cr 2 O 7

Answer

None of these

Question 5

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm 2 .

Accepted Answer

18

Answer

6

Answer

38

Answer

52

Question 6

At absolute zero temperature, for any reaction involving condensed phases

Accepted Answer

Δ S° = 0, Δ E° = 0

Answer

Δ G° = 0, Δ H° = 0

Answer

Δ H° = 0, Δ S° = 0

Answer

Δ S° = 0, Δ C p ° = 0

Question 7

The Al 2 O 3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

Accepted Answer

2 - 5

Answer

18 - 20

Answer

12 - 15

Answer

6 - 12

Question 8

Drossing is a __________ operation.

Accepted Answer

Roasting

Answer

Smelting

Answer

Dressing

Answer

Dressing

Question 9

Glass reacts with

Accepted Answer

HF

Answer

H 2 SO 3

Answer

HNO 3

Answer

K 2 Cr 2 O 7