I'm pretty sure I'm right, but please check to see if these are correct:

1. Which of the following lathe operations cuts an angled surface between two diameters on a workpiece?
a. chamfering
b. tapering
c. threading
d. knurling

A
2. The three basic groups of saws according to the type of blade used by the sawing machine are: circular, band, and,
a. radial saws.
b. scroll saws.
c. table saws.
d. power saws.

B
3. In an internal combustion engine, during which stroke is the fuel-air mixture forced into the cylinder?
a. intake
b. compression
c. power
d. exhaust

A
Thanks

To check if your answers are correct, let's go through each question and explain the reasoning behind the correct answer:

1. Which of the following lathe operations cuts an angled surface between two diameters on a workpiece?
a. chamfering
b. tapering
c. threading
d. knurling

Correct Answer: a. chamfering

Explanation: Chamfering is the process of cutting or shaping an angled or beveled surface at the end or edge of a workpiece. This operation is used to create angled surfaces between two diameters on a workpiece.

2. The three basic groups of saws according to the type of blade used by the sawing machine are: circular, band, and,
a. radial saws
b. scroll saws
c. table saws
d. power saws

Correct Answer: b. scroll saws

Explanation: The three basic groups of saws are circular saws, band saws, and scroll saws. The term "sawing machine" refers to these three types of saws. Therefore, the correct answer is b. scroll saws.

3. In an internal combustion engine, during which stroke is the fuel-air mixture forced into the cylinder?
a. intake
b. compression
c. power
d. exhaust

Correct Answer: a. intake

Explanation: In a four-stroke internal combustion engine, the fuel-air mixture is forced into the cylinder during the intake stroke. This stroke is responsible for drawing in the fuel-air mixture into the cylinder for combustion. Therefore, the correct answer is a. intake.

Based on the explanations provided, it seems that your answers are correct:
1. (a) chamfering
2. (b) scroll saws
3. (a) intake

Well done!