Test Your knowledge on Cooling Tower – Online Quiz

Cooling tower is an essential piece in most of the Chemical Process Industries and in HVAC applications. Chemical Engineering Site already published articles on Cooling Tower Components and Cooling Tower Efficiency Calculations. This Cooling Tower Quiz module covers the Design, Calculations, Operations and Cooling Water treatment etc which will be a refresher for the experience and an eyeopener for the fresh chemical engineers. This cooling tower quiz also explains about some myths and facts, which you will find after completing the Quiz.

Approach of a Cooling Tower is

Difference between Cold water outlet temperature and Wet bulb temperature

Difference between Hot water Inlet temperature and Wet bulb temperature

Difference between Hot water Inlet temperature and Cold Water Outlet temperature

Difference between Atmoshpheric temperature and Wet bulb temperature

Purpose of Louver is

To change the direction of Air inlet flow in the uniform manner

To prevent the water droplets splashing out of the tower

Both of the Above

None of the Above

Range of the Cooling tower is

Difference between Cold water outlet temperature and Wet bulb temperature

Difference between Hot water Inlet temperature and Wet bulb temperature

Difference between Hot water Inlet temperature and Cold Water Outlet temperature

Difference between Atmoshpheric temperature and Wet bulb temperature

Purpose of Drift Eliminator is

To reduce the entrainment of Water droplets in Air

To prevent the water droplets splashing out of the tower

To provide the required surface area for heat transfer

All of these

The ratio of dissolved solids in circulating water to dissolved solids in makeup water is called as

Evaporation ratio

Cycle of Concentration

L/G Ratio

Efficiency

Purpose of blowdown is to

Remove the heat from Hot water

Maintain the Cold Water outlet temperature

Limit the increase in the concentration of solids in the water due to evaporation

To increase the efficiency

Cooling tower acceptance testing procedures are recommeded by

CTI

API

ASME

ISO

Natural Draft or Hyperbolic towers have been used for

Large Capacity of water

Small Capacity of Water

High Efficiency

Low capital cost

Purpose of Cooling tower basin is

To serve as receptacle for Cooled water

To provide the storage capacity during Makeup water failure

To act as a reservoir for the cooling water pumps

All of these

10.

The type of Cooling tower used in Power plants is

Hyperbolic Natural Draft Towers

Forced Draft Counterflow Towers

Induced Draft Counterflow Towers

Dry Towers

11.

A better Performance indicator of the Cooling tower is its

Dry bulb temperature

Approach

Range

Wet bulb Temperature

12.

L / G ratio in cooling tower is the ratio between

Load and Temperature gradient

Length and girth

Air mass flow rate and water flow rate

Water flow rate and Air mass flow rate

13.

Cooling Tower Efficiency =

Range/ (Range + Approach) x 100

Range/ Approach x 100

Approach/ Range x 100

Cold Water Temperature/ Hot water Temperature x 100

14.

In practice, Common efficiency range achieved in the cooling tower is

98 to 100 %

90 to 95 %

95 to 98 %

70 to 75 %

15.

The cycle of concentration normally varies from

0 to 3

3 to 7

10 to 15

15 to 100

16.

To reduce the makeup water requirement of the cooling tower, Cycle of Concentration to be kept

Very High

As High As Possible

Low

Very Low

17.

Calculate the blow down loss of the Cooling tower from the following data. a) Evaporation Loss is 500 m3/hr, b) Cycle of Concentration is 5

100 m3/hr

2500 m3/hr

125 m3/hr

Data Insufficient

18.

Instrument used for Measuring Wet bulb Temperature is

Thermometer

Sling Psychrometer

Thermocouple

RTD

19.

The temperature selection normally chosen for designing of cooling tower is

Average maximum wet bulb for winter months

Average maximum wet bulb for summer months

Average minimum wet bulb for winter months

Average minimum wet bulb for summer months

20.

In a Daily Variation, Wet bulb temperature is maximum at

4 AM

4 PM

8 AM

8 PM

21.

Which of the following is helpful in designing Cooling tower orientation?

Wind rose Diagram

Topographic map

Rain gauge recorder chart

Seismic Scale

22.

The Purpose of fill is

To prevent the water droplets splashing out of the tower

To provide the required surface area for heat transfer between air and the water

To reduce the entrainment of Water droplets in Air

To change the direction of Air inlet flow in the uniform manner

23.

The purpose of Torque tube is

To Transmit the power from the motor

To Give permanent alignment of the motor, driveshaft & gear reducer

To reduce the speed of the depending on the fan requirement

None of these

24.

The purpose of Open disengaging stack is

To send the hot air from Cooling water out

To prevent the water droplets splashing out of the tower

To prevent tower from damage because of large gases in hot cooling water

None of these

25.

Cooling towers operate on the principle of

Evaporative Cooling (Merkel Theory)

Henry's law

Stefan-Boltzmann Law

All of these

26.

In which of the following fill Surface Area is more?

Splash Fill

Film Fill

27.

FRP fan blades are used in Cooling tower applications because

It needs low starting torque

Easy handling and maintenance

Energy Efficient than Metal blades

All of these

28.

Poor water distribution in a tower results in

Scale formation on fill

Ice formation in cold climates

wastage of Energy

All of these

29.

Type of Level Measuring instrument used in Cooling Tower Basin is

Wet Leg DP Type

Gauge Glasses

Bubbler Type DP Cell

None of these

30.

To prevent Scaling Silica level in Cooling water must be

Less than 500 ppm

Less than 150 ppm

Less than 1000 ppm

Less than 1500 ppm