B. Aquaculture Engineering

Question 1

A culture system that is built in shallow waters and is made of bamboo poles surrounded by a fish net.

a. Fish pond
b. Fish pen
c. Fish cage
d. Fish tank

Answer 1

b. Fish pen

Question 2

A culture system that is built in deep waters. It uses fiberglass, plastic or steel and nets held up by floaters.

a. Fish pond
b. Fish pen
c. Fish cage
d. Fish tank

Answer 2

c. Fish cage

Question 3

A culture system that is enclose (earthen or concrete) built to retain water for the purpose of growing fish.

a. Fish pond
b. Fish pen
c. Fish cage
d. Fish tank

Answer 3

a. Fish pond

Question 4

These are floating structures in open water and are usually located within a pond, lake, reservoir, river, estuary, or open ocean environments.

a. Fish pond
b. Fish pen
c. Fish cage
d. Fish tank
e. b or c

Answer 4

e. b or c

Question 5

Part of cage structure that keeps the cage at the surface of the water and helps maintain the shape of the cage in the vertical and horizontal planes. It can be made of large diameter rubber hose or high-density polyethylene tubes or pipes.

a. Floats
b. Collar
c. Nets
d. Mooring

Answer 5

a. Floats

Question 6

Part of cage structure that maintains the shape of the cage in the horizontal plane. It may simply be a ring of metal placed at the bottom of the cage to weigh the cage down in the required shape or it can be a complicated design involving flotation and weights.

a. Floats
b. Collar
c. Nets
d. Mooring

Answer 6

b. Collar

Question 7

A type of net in cages that holds the cultured stock.

a. Main net
b. Covering net
c. Predator net
d. Jump net

Answer 7

a. Main net

Question 8

This net in cage system keeps sea-borne predators away from the cultured stock to reduce predation. It is placed outside the main net.

a. Main net
b. Covering net
c. Predator net
d. Jump net

Answer 8

c. Predator net

Question 9

This net in cage system is placed over the top of the cages to prevent birds landing, fouling, scavenging and preying on cultured stock.

a. Main net
b. Covering net
c. Predator net
d. Jump net

Answer 9

b. Covering net

Question 10

This net in cage system projects vertically out of the water around the main net, preventing fish escaping.

a. Main net
b. Covering net
c. Predator net
d. Jump net

Answer 10

d. Jump net

Question 11

These are used to secure the cage at the selected site.

a. Floats
b. Collar
c. Nets
d. Moorings

Answer 11

d. Moorings

Question 12

Aquaculture facilities associated with reproduction, larval rearing and supply of juveniles to farms.

a. Nursery
b. Grow-out
c. Hatchery
d. None of the above

Answer 12

c. Hatchery

Question 13

A measure of the amount of oxygen that bacteria will consume while decomposing organic matter under aerobic conditions.

a. BOD – Biochemical Oxygen Demand
b. COD – Chemical Oxygen Demand
c. DO – Dissolved oxygen
d. EC – Electrical conductivity

Answer 13

a. BOD

Question 14

A measure of the total quantity of oxygen required to oxidize all organic material into carbon dioxide and water.

a. BOD – Biochemical Oxygen Demand
b. COD – Chemical Oxygen Demand
c. DO – Dissolved oxygen
d. EC – Electrical conductivity

Answer 14

b. COD

COD values are always greater than BOD values, but COD measurements can be made in a few hours while BOD measurements take five days

Question 15

A measure of the amount of free hydrogen ions in water.

a. EC
b. pH
c. DO
d. EC

Answer 15

b. pH

Specifically, pH is the negative logarithm of the molar concentration of hydrogen ions
.
pH = -log[H+]

above 7 = alkanine
7 neural
below 7 = acidic

Question 16

Part of a pond dike (main dike) that provides additional stability and it slopes towards the dike wall to trap eroded soil particles during rains. It also serves as small ditch that conveys runoffs towards the outlet gate especially when acidity of exposed dike is a management problem.

a. Crown
b. Base
c. Berm
d. Side slope

Answer 16

c. Berm

Question 17

It refers to the vertical distance from the surface of water (including drawdown) to centerline of the pump impeller.

a. Total dynamic head
b. Discharge head
c. Suction head
d. None of the above

Answer 17

c. Suction head

Question 18

It refers to the vertical distance from the centerline of the impeller to point of discharge.

a. Total dynamic head
b. Discharge head
c. Suction head
d. None of the above

Answer 18

b. Discharge head

Question 19

The sum of the suction head, discharge head, hydraulic head losses and the velocity head.

a. Total dynamic head
b. Discharge head
c. Suction head
d. None of the above

Answer 19

a. Total dynamic head

Question 20

The lowering of water surface below the static level during pumping.

a. Total dynamic head
b. Discharge head
c. Suction head
d. None of the above

Answer 20

d. None of the above

Answer: drawdown

Question 21

Refers to the water level before pumping begins.

a. Drawdown
b. Static level
c. Hydraulic loss
d. None of the above

Answer 21

b. Static level

Question 22

Refers to the loss due to pipe wall friction, elbow design, joints, gate valves, sudden reduction or enlargement of pipe size. This is expressed in its equivalent height or head of water loss.

a. Hydraulic loss
b. Friction loss
c. Discharge loss
d. None of the above

Answer 22

a. Hydraulic loss

Question 23

Refers to the rate of flow or the volume of water pumped per unit time such as gallons per minute; cubic feet per second; cubic meters per minute; liters per second; etc.

a. Discharge
b. Velocity
c. Suction
d. None of the above

Answer 23

a. Discharge

Question 24

In pump terminologies, NPSH means

a. Net positive suction head
b. Net possible suction head
c. Negative/positve suction head
d. None of the above

Answer 24

a. Net positive suction head