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Nutrition 214 > Microwave cooking > Flashcards

Flashcards in Microwave cooking Deck (41)
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1

What does RADAR stand for?

RAdio Detection And Ranging

2

Micorwave radio signals were used in WW2 as

a track of the enemy

3

What is the approximate frequency of the microwave?

10^10 Hz

4

The definition of the microwave

Nonionizing waves of energy that create thermal changes
Do not cause dangerous chemical changes( as do ionizing rays)

5

What can be done with micro waves( 3 things)

Absorbed
Transferred
Reflected

6

In the microwave the heat is transferred via

Electromagnetic radiation

7

What is the driver of the waves in the microwaves

Magnetron

8

How does the microwave work?

-Vacuum electron tube that converts the electricity into microwaves
-The microwaves are set in motion by a fan.
-The waves are bouncing from the walls of the microwave
-Turntable helps to cook evenly

9

What is the power of the microwave?

500-750 watts

10

How is the food heated with the microwave?

The polarity is reversed 5 billion times a second
-Two major interactions ( with water and ionic conduction ( like Na+Cl-))
-Generation of the heat by fraction and transfer to other molecules by conduction

11

What are the appropriate materials for the containers?

Glassware,china,ceramic,plastic( heat tempered), paper towel( not for long), other that are labeled microwave safe

12

Why would you place round container in the microwave rather than rectangular?

Round- equal opportunity
Rectangular- heating more in the corners

13

Why should you use shallow containers?

Because the depth of the micro wave is limited ( approximately 10 cm)

14

Why you should not put recycled paper/ brown bags or metal dishes( aluminum foil)

The paper can catch fire
Metal( especially pointy) can create an accumulation of charge and cause fire
From the metal the waves bounce off( the walls of the microwave are metal)

15

What are three guidelines if you still want to use the metal in the microwave?

-Reasonably large
-Kept away from the walls
-Metal/foil is grounded along the bottom of microwave

16

The foods in the microwave cook from the ____, that is why you need to place ___ portions on the outside

Outside
Denser

17

What is the arrangement of the objects if you heating multiple items

The center should be left empty, because it will not get the microwaves from the walls , but only from the top, but the time should be prolonged, do unequal cooking

18

What should you do with the potatoes and hot dogs before cooking in the microwave?

Pierce in skin/peel so they do not explode

19

What portions should you place in the microwave

Smaller pieces are cooked faster

20

Why you should not heat in plastic?

Can be endocrine disturbers , heating the plastic can transfer this particles, fat and cheese,fatty food are more vulnerable

21

Microwave is very drying, so what should be done to hold moisture, avoid spattering and retain heat

Use paper towels,waxed paper, plastic wrap, microwavable covers
-Cover loosely to let steam escape

22

What factors influences the difference in cooking different food?

-Density
– Volume
– Starting temp
– Shape of food( pointy vs round)
– Composition of food
-Container

23

How can you avoid uneven cooking?

-Stirring
-Rearranging/rotating
-Standing time (The amount of time it takes for food molecules to
stop vibrating after microwave process ends
• Cooking continues during this period of time, so it
is factored into the recipe’s time requirement)

24

Cooking vegetables in the microwave retains

Vitamins and minerals

25

What are cooking tips for cooking vegetables in the microwave?

-cooked quickly, covered, a little water added
(to prevent moisture loss)
– Pieces cut into similar-sized thin pieces;
arranged in single layer, or loose pile

26

Why cooking meat in the microwave is not ideal?

Dries out meat, no browning (flavour not developed),
temp not high enough to kill pathogens

27

Why you should not salt the meat until the end of the cooking when cooking in the microwave

-toughening effect

28

Better result in the microwave is produced by

Tender , small cuts

29

For cooking meat in the microwave you should

Cover the meat and add liquid

30

Why fish is ideal for cooking in the microwave?

Because of thin dimension /tenderness of
fillets and steaks (requires short cooking time)