Chemical Engineering Mcqs Practice Test

Question 1

The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

Accepted Answer

D. 0.13

Question 2

In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________________?

Accepted Answer

B. 60.3

Question 3

Volume occupied by one gm mole of a gas at S.T.P. is ____________________?

Accepted Answer

A. 22.4 litres

Question 4

Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

Accepted Answer

C. Pressure

Question 5

According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

Accepted Answer

B. T0.5

Question 6

The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole?

Accepted Answer

B. 0

Question 7

Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

Accepted Answer

A. Carbonate (monohydrate)

Question 8

A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

Accepted Answer

B. 630

Question 9

500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _____________ mm Hg?

Accepted Answer

A. 650

Question 10

A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

Accepted Answer

C. -136.5°C

Question 11

A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?

Accepted Answer

C. 30.6

Question 12

1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?

Accepted Answer

A. 1

Question 13

For the gaseous phase reaction, N2 + O2 ⇌ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by____________________?

Accepted Answer

B. Decrease in temperature

Question 14

In _______________ process, ions of salts react with water to produce acidity or alkalinity ?

Accepted Answer

B. Hydrolysis

Question 15

The value of (Cp – Cv) for a real gas obeying Vander Wall’s equation is____________________?

Accepted Answer

B. > R

Question 16

One ‘Therm’ is equivalent to___________________?

Accepted Answer

A. 105 BTU

Question 17

Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?

Accepted Answer

B. 0.58

Question 18

How much O2 can be obtained from 90 kg of water ?

Accepted Answer

B. 80 kg

Question 19

What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?

Accepted Answer

A. AB3

Question 20

Which of the following has the smallest least effect on the solubility of a solute into the solvent ?

Accepted Answer

D. Pressure