QUIZ MCQ

Question 1

The appropriate irrigation for crucifers and low-lying vegetable crops

Answer 1

sprinkler/drip irrigation

Question 2

Calculate the pump power for a discharge of 5 Lps against a total head of 20 m.

Answer 2

981 W

Question 3

Applicator used in drip, subsurface or bubbler irrigation designed to discharge small uniform flow of water at constant rate and dissipated pressure

Answer 3

emitter

Question 4

At optimal emitter spacing, drip emitter spacing is of the wetted diameter estimated from field tests

Answer 4

0.8

Question 5

The type of drainage system layout suitable for concave areas is

Answer 5

random

Question 6

Which classification of pump delivers the same amount of water regardless of pressure head?

Answer 6

positive displacement pump

Question 7

What is a disadvantage of the W ditch drainage system?

Answer 7

it cannot be used as a turn row

Question 8

A sprinkler irrigation system composed of portable or buried pipe with valve outlets at intervals for attaching the portable laterals

Answer 8

hand - move system

Question 9

What is the appropriate irrigation system for irrigating a 10-hectare cabbage crop?

Answer 9

sprinkler irrgation

Question 10

Which pump is appropriate for pumping muddy water from a tilapia fish pond?

Answer 10

centrifugal pump

Question 11

A 29-meter deep pump uses a centrifugal pump and exhibits gassing when turned on and cannot produce water. The pump elevation is 620 meters above mean sea level. As an evaluator, what is technically wrong with the pump?

Answer 11

site elevation is high

Question 12

A centrifugal irrigation pump, installed 30 meters above an unconfined aquifer, exhibits gassing when turned on and cannot produce water. The pump elevation is 575 meters above mean sea level. What is your recommendation to make pumping operational?

Answer 12

replace pump with a submersible pump

Question 13

Laterals enter the submain from one side only to minimize the double drainage that occurs near the submain

Answer 13

herringbone

Question 14

You need to select a pump for use in the automation of water pumping in a sprinkler system. What pump will you use?

Answer 14

electric pump

Question 15

The depth of water to be removed from a drainage area in 24 hrs is called

Answer 15

drainage coefficient

Question 16

You are assigned to carry out irrigation planning of a 200 hectare banana plantation. What is the appropriate irrigation system?

Answer 16

drip irrigation

Question 17

A pump operates at 1800 rpm, delivering 800 L/s at a head of 150 m. If the impeller speed is increased to 2200 rpm, what will be the approximate new flow rate?

Answer 17

978 L/s

Question 18

Which of the following statements best describes a dynamic pump?

Answer 18

its discharge decreases as pressure head increase

Question 19

How many sprinklers with spacing of 7mx7m are needed to irrigate a rectangular field of 150m x200m if the laterals are set parallel to the larger side of the field?

Answer 19

588

Question 20

Which of the following is a major effect of excess water on plant growth?

Answer 20

promotes diseases and parasites

Question 21

The repeated pumping of the newly constructed well in order to remove the fine materials so as to prevent entry of muddy water, minimize head and well losses and the maximize the effective hydraulic radius of the well is

Answer 21

well development

Question 22

Which indicator suggests that the soil has been waterlogged at certain times of the year?

Answer 22

rusty and mottled soil

Question 23

What is a key disadvantage of centrifugal pumps?

Answer 23

cannot self - prime

Question 24

It involves irrigating alternate furrows rather than every furrow. Small amounts applied frequently in this way are usually better for the crop than large amounts applied after longer intervals of time.

Answer 24

alternate furrow irrigation

Question 25

Using your knowledge in pumps, which of the following pumps is best for pumping water with algae from a 5.6-cubic meter hatchery tank into a series of milkfish larval rearing tanks?

Answer 25

centrifugal pump

Question 26

When the air temperature is above threshold, cooling down inside a lettuce greenhouse needs to be carried out. What is the appropriate method for cooling?

Answer 26

mist irrigation

Question 27

The most commonly used pump in sprinkler irrigation system

Answer 27

centrifugal pump

Question 28

The suction head of centrifugal pump should not exceed the

Answer 28

maximum practical suction lift

Question 29

If the impeller width of a pump is decreased by 40%, what will happen to the head required?

Answer 29

decrease by 64%

Question 30

In surface irrigation, intermittent application is done to

Answer 30

attain relatively uniform application

Question 31

As an Agricultural and Biosystems Engineer, you are tasked to plan an irrigation project for a 200 hectare lowland rice. What is the appropriate irrigation system?

Answer 31

flooding irrigation

Question 32

Portion of the pipe network between the mainline and the laterals.

Answer 32

manifold

Question 33

Which drainage system is most suitable for sloping land where soils have poor internal drainage, subsurface drainage is not economical, and the slope is too steep for bedding or ditch systems?

Answer 33

surface drains or open ditches

Question 34

The TDH of the sprinkler irrigation system is composed of the following, except

Answer 34

emitter pressure

Question 35

Irrigation method that is not suitable when the irrigation water has high salinity is

Answer 35

wild flooding

Question 36

Type or irrigation with water application rate of 2-20 Lps and with water applied close to plants near its root zone

Answer 36

drip