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MIC 121 Introduction what are microbes Objective Question
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Question

What is the key difference in operation between gravity convection and mechanical convection processes in a hot air oven?
Options
A Gravity convection uses a fan; mechanical convection relies on natural air movement.
B Gravity convection provides uniform temperature; mechanical convection has inconsistent temperature.
C Gravity convection relies on heated air rising and displacing cooler air; mechanical convection uses a blower to force air.
Correct Answer
D Gravity convection is for dry heat; mechanical convection is for moist heat.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 24, under 'PRINCIPLE OF HOT AIR OVEN', explains: 'a) Gravity convection process: Heated air expands and possesses less density than cooled air which rises up and displaces the cooler air (the cooler air descends). It produces inconsistent temperature within the chamber thus has a slow turnover.' and 'b) Mechanical convection: Use of fitted blower or fan that actively forces heated air throughout all areas of the chamber.'

Hint

Locate the 'PRINCIPLE OF HOT AIR OVEN' section and compare the descriptions of gravity and mechanical convection.

Question Info

Course: MIC 121
Topic: Introduction what are microbes
Type: Objective
Difficulty: Not specified
Question 646 of 984
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