Pre-Board

Question 1

Gives the monochromatic emissive power for black body radiaton

Answer 1

Plank’s law

Question 2

In case of evaporators, liquid entrainment results primarily due to

Answer 2

Foaming of the solution

Question 3

Cylindrical storage tanks used for the storage of volatile liquids (eg naphtha) have __________ roofs

Answer 3

floating

Question 4

A 0.5% solution is used for microbial cleaning. Which of the following is most appropriate?

Answer 4

Organic chlorine

Question 5

What is the most commonly used elutriating agent in adsorption

Answer 5

methane

Question 6

Viscose rayon is chemically

Answer 6

Regenerated cellulose acetate

Question 7

In isothermal flow of gases through pipelines, the pressure drop is primarily proportional to

Answer 7

Mass velocity

Question 8

Actual work delivered divided by the corresponding ideal work is known as ___________ efficiency

Answer 8

turbine

Question 9

The shell side pressure drop in a shell and tube heat exchanger is maximum for ________ baffle

Answer 9

orifice

Question 10

In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Answer 10

Liquid gradient on the tray

Question 11

Fluidised bed reactor is characterized by

Answer 11

Uniformity of temperature

Question 12

The critical radius of insulation for spherical shell is (where K=thermal conductivity of insulating material, h= heat transfer coefficient at the outer surface)

Answer 12

2k/h

Question 13

If produced from stationary phase, rate of protogon synthesis

Answer 13

0

Question 14

A reciprocating internal combustion engine has a clearance volume of 0.0001m3 and a compression
ratio (volume ratio) of 10. The pressure and temperature of the combustion gases when the piston
is at top dead centre are 4000 kN/m2 and 1800ºC respectively.

Assuming that the expansion process follows PV1.3 = constant, calculate:

a) the work transfer in this process, and
b) the temperature of the gases at the end of the process.

Answer 14

A. 66.7J
B. 1039 K

Question 15

The region of an airlift bioreactor in which the liquid travels in a downward direction

Answer 15

downcomer

Question 16

In heat transfer between a metal surface and a fluid, the major thermal resistance is typically found

Answer 16

At the boundary layer near the metal

Question 17

Which enzyme catalyzes the conversion of pyruvate to lactate using NADH as a cofactor

Answer 17

Lactate dehydrogenase

Question 18

For high pressure process equipments/vessels, the connected nozzle should be

Answer 18

flanged

Question 19

The temperature of tampering oil baths maintained at 400 C during heat treatment of steel is measured by ________ thermocouple

Answer 19

iron-constantan

Question 20

For a cyclone of a diameter 0.2m with a tangential velocity of 15m/s at the wall, the separation factor is

Answer 20

230

Question 21

Cavitation is most likely to occur under which of the following conditions

Answer 21

Big velocity change

Question 22

What is the reflux ratio at total reflux

Answer 22

infinity

Question 23

column support for the roof of cylindrical storage tank must be provided for

Answer 23

Large diameter tanks

Question 24

The filtrate flow rate in constant pressure filtration

Answer 24

Continuously decreases

Question 25

Milk initially at 30ºC is to be kept in a chilled tank at 5ºC. If the total volume of milk is 100 litres, its density is 1100kg/m3 and the specific heat capacity of 4.2kJ/kgK. a) Determine the heat extraction rate assuming the chiller to be **perfectly insulated** b) What would be the chiller consumption if heat transfer through the chiller body is? i. + 5kW gain in summer, ii) -5kW loss in winter

Answer 25

A. 11.55 KW (insulated) B. 16.55 KW (summer) C. 6.55 KW (winter)

Question 26

Which separation method is most suitable when dealing w/ mixtures that have **high liquid hold-up**

Answer 26

filtration

Question 27

For a cylindrical shell (subject to the thickness of uppermost course being more than the minimum for the diameter of the tank in question), the thickness of the course of shell

Answer 27

decreases upwards

Question 28

Bulk diffusion in catalyst pore ___________ with increase in pressure

Answer 28

decrease

Question 29

In an ideal PFR at steady state conditions

Answer 29

The conversion of the reactant varies from point to point along a flow path

Question 30

A metal surface has a 5cm **hole** the must be addressed to ensure structural integrity, which is most appropriate action?

Answer 30

reinforce

Question 31

The ratio of **average fluid velocity** to the **maximum velocity** in case of **laminar flow** of a **Newtonian fluid** in a **circular pipe** is

Answer 31

0.5