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1st 6 Month Final > Basic Mechanics > Flashcards

Basic Mechanics Flashcards

1
Q

25 ft/s East is an example of what?

A

Velocity

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2
Q

Every applied force is matched by a force that:

A

Is opposite in direction and equal in magnitude.

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3
Q

Give an example of thermal expansion:

A

Road buckling due to freezing water

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4
Q

In the English system, forces are measured in _________

A

Pounds

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5
Q

A vector is used to designate ______ and ___________

A

Size and direction

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6
Q

One equation for work?

A

Force x distance

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7
Q

What is energy?

A

The ability to do work

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8
Q

How much power is used when lifting a 30lb object a distance of 12 ft in 10 seconds?

A

Work = 30(12); 360/10= 36ft lb/sec

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9
Q

BTU is a measure of what?

A

Heat (British thermal unit)

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10
Q

In a machine that is 90% efficient, 10% shows up as what?

A

Heat (friction)

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11
Q

PSIA stands for:

A

Pounds per square inch, absolute

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12
Q

Lengthening the tubing in fluid power systems __________ the friction head.

A

Increases

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13
Q

One important difference between gas and liquids?

A

Gas can be compressed

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14
Q

The source of pressure exerted on an unconfined liquid is:

A

Gravity

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15
Q

How do you figure out absolute pressure from gauge pressure?

A

Add 14.7psi

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16
Q

A cam and follower mechanism changes rotary or linear motion to:

A

Reciprocating motion

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17
Q

When a simple machine is used to gain speed, it is at the expense of:

A

Force or effort

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18
Q

Name the 6 simple machines:

A

Lever, pulley, wedge, wheel and axel, inclined plane, screw.

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19
Q

Which class of lever changes the direction of force?

A

Class 1 (see-saw)

20
Q

Actual mechanical advantage is less than ideal because of:

A

Internal friction

21
Q

A combo of 2 or more machine parts is called a:

A

Mechanism

22
Q

A bell crank has ___ fixed point(s) and ___ movable pivot point(s)

A

1;2

23
Q

The input motions of a cam and follower are either:

A

Rotary or linear

24
Q

The electric motor is the ________________ of a machine

A

Prime mover

25
Q

The most useful type of motion for mixers/cutters is:

A

Oscillating

26
Q

Stroboscopic light is often used for:

A

Rotational speed

27
Q

Ultrasonic flow meters cannot be used u less the fluid:

A

Contains bubbles or suspended solids

28
Q

If an instrument has accuracy of plus or minus 1% and a temp of 500°, what temps could it actually be?

A

495°-505°

29
Q

What instrument measures airflow?

A

Anemometer

30
Q

The probe of a vibration meter uses ____________ to take measurements.

A

Electric current

31
Q

What tool is used to cut heavy-gauge sheet metal?

A

Bulldog snips

32
Q

One use for pliers is:

A

Bending metal

33
Q

To clamp 2 pieces of metal together for welding, use:

A

Locking pliers

34
Q

Another name for a machinists hammer?

A

Ballpeen hammer

35
Q

What tool is it okay to strike with a hammer?

A

Punches

36
Q

To minimize risk of shock, you should stand on a(n) _____________ platform.

A

Insulated

37
Q

You must wear ______ protection when grinding, chipping, hammering.

A

Eye

38
Q

Before changing a bit or blade, you must:

A

Disconnect power

39
Q

For safety, when using an electric drill, ___________ the chuck key before using

A

Remove

40
Q

Prevailing torque nut vs free spinning lock nut?

A

?

41
Q

Machine screws are used for:

A

Light duty applications

42
Q

The distance from one crest to the next on a screw thread is called the:

A

Pitch

43
Q

What type of nut is used when screwing nut and bolt with cotter pin?

A

Castle

44
Q

Sliding friction causes:

A

Wear, energy loss, and heat

45
Q

What type of friction prevents motion of an object at rest?

A

Static friction

46
Q

Name 3 types of kinetic friction:

A

Sliding, rolling, and fluid

47
Q

What type of wear leaves blotchy, mottled appearance in metal?

A

Corrosive wear

1st 6 Month Final (9 decks)

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