Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Local 30 Test Review > AJ's Answers > Flashcards

AJ's Answers Flashcards

1
Q

What is each component

A

Red: Resistor, zigzags
Blue: Diode, triangle
Green: Capacitor, 2 lines with gap between

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Velocity formula

A

V = I x R
R = V/I
I = V/R

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a double pole single switch

A

Two separate lines that are opened and closed by the same switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the OSHA code for lock out tag out

A

29 CFR 1910.147

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Color signs on DOT truck blue, yellow, red

A

Blue—road user services guidance, tourist information, and evacuation route

Red—stop or prohibition

Yellow—warning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
A

Sheet Bend Knot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
A

Clover Hitch Knot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
A

Double Half Hitch Knot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
A

Inside Bowline Knot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
A

Square Knot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Zerk Fitting

A

feeds lubricants like lubricating grease into a bearing using a grease gun

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Degrees’ for 3, 4, 5, and 6 rings of packing

A

3 rings- 120°
4 rings- 90°
5 rings- 72°
6 rings- 60°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Viscosity

A

Determines the thickness and health of the oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Tool that measures rpm

A

Tachometer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Sodium Bicarbonate

A

Raises alkalinity in a pool

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How to change rotation of a motor

A

Change the connections of two of the power lines to the motor leads/change the polarity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Use Fan Guard

A

Provides a physical barrier around the spinning fan blades for safety

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

1 fan belt breaks on a 3 belt pulley, how many do you change

A

All of them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Cubic inches to cubic feet

Cubic feet to cubic inches

A

0.000578704 ft^3

1728 in^3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Street elbow

A

Bent to connect two pipes at an angle. One end male and one end female

20
Q

Trycocks use

A

3 on the boiler that show the state of the steam: dry, wet, and wet steam (most likely locate on the tank)

21
Q

Handheld grease gun pressure

A

Capable of over 10,000 psi

22
Q

Positive displacement pump

A

Flow is created and pressure results

23
Q

Non-positive displacement pump

A

pressure is created and flow results

24
Q

Difference between positive and non-positive displacement pumps

A

The pressure flow thing and also

positive displacement pumps, efficiency increases with increasing viscosity. On the other hand, efficiency of non-displacement pumps decreases with increasing viscosity due to frictional losses inside the pump

25
Q

How many safety valves on a 950 pound boiler

A

2

one every 500 pounds
(1175 lb has 3)

26
Q

Solenoid on circuit diagram

A

Looks like this with the bumps

Or looks like a coil or loops because its a coil

27
Q

area of circle and circumference formulas and pi

A

A= πr^2

C= 2πr

π= 3.141

28
Q

Flammability and toxicity of B2 refrigerant

A

B refrigerants are highly toxic (A is low toxic), 2 is highly flammable (is less flammable)

29
Q

Pool well mixed water test sample

A

Acceptable PH 7.2 - 7.8, minimum 18” from the surface

30
Q

Max turnover rate for main pool

A

8 hours

31
Q

2 types of packing

A

mechanical seal and packing gland

32
Q

What isn’t a cause of foaming in hydronic centrifugal pump

A

caviation

33
Q

If a centrifugal pump shaft is worn out what’s the likely cause

A

Warn bearings or broken packing ring

34
Q

Why should you never use compressed air in refrigeration lines

A

because they contain moisture, and moisture reacts with oil in the system

35
Q

what should you do first if you see an oil spill

A

Contain if possible OR notify engineering

36
Q

What is one of the negative effects of having high voltage AHU

A

High Voltage use

37
Q

what is the likely cause if a boiler is constantly turning on and off hvac

A

High or low water pressure, damaged heat exchanger, a faulty thermostat or a malfunctioning heat pump

38
Q

The relationship between lubricating oil viscosities and temperature is that the viscosties

A

lower when temperature rises

39
Q

A 3 part belt pulley
1: 10”
2: 5”
3: 10”
1 rotates 10 times, how many times does 3 rotate

A

20 times, 2 is half of 1 so it rotates double and 3 is directly connected to 2 so it rotates the same amount as 2

40
Q

what type of metal is a wire rope made of

A

galvanized or stainless steel

41
Q

What is the spacing between the grinding wheel and pad

A

1/8th of an inch

42
Q

max temp for a spa

A

104 degree

43
Q

electric symbol for switch DPST or SPDT

A

Single Pole Double Throw is one line that switches up to one line or down to another

Double Pole Single Throw is two lines that are controlled by the same switch that go into their own respective lines when closed

44
Q

HVAC piping symbol

A

circle with an X in it

45
Q

What would be the main cause of stopping a boiler

A

high opacity

46
Q

3 types of lubricant feed systems

A

gravity, forced, ???

47
Q

What type of grease for A100 bearing

A

high maybe

Local 30 Test Review (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions