AJ's Answers

Question 1

What is each component

Answer 1

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

Question 1

Velocity formula

Answer 1

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

Question 2

What is a double pole single switch

Answer 2

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

Question 3

What is the OSHA code for lock out tag out

Answer 3

29 CFR 1910.147

Question 4

Color signs on DOT truck blue, yellow, red

Answer 4

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

Red—stop or prohibition

Yellow—warning

Question 5

Answer 5

Sheet Bend Knot

Question 6

Answer 6

Clover Hitch Knot

Question 7

Answer 7

Double Half Hitch Knot

Question 8

Answer 8

Inside Bowline Knot

Question 9

Answer 9

Square Knot

Question 10

Zerk Fitting

Answer 10

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

Question 11

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

Answer 11

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

Question 12

Viscosity

Answer 12

Determines the thickness and health of the oil

Question 13

Tool that measures rpm

Answer 13

Tachometer

Question 14

Sodium Bicarbonate

Answer 14

Raises alkalinity in a pool

Question 15

How to change rotation of a motor

Answer 15

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

Question 16

Use Fan Guard

Answer 16

Provides a physical barrier around the spinning fan blades for safety

Question 17

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

Answer 17

All of them

Question 18

Cubic inches to cubic feet

Cubic feet to cubic inches

Answer 18

0.000578704 ft^3

1728 in^3

Question 19

Street elbow

Answer 19

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

Question 20

Trycocks use

Answer 20

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

Question 21

Handheld grease gun pressure

Answer 21

Capable of over 10,000 psi

Question 22

Positive displacement pump

Answer 22

Flow is created and pressure results

Question 23

Non-positive displacement pump

Answer 23

pressure is created and flow results

Question 24

Difference between positive and non-positive displacement pumps

Answer 24

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

Question 25

How many safety valves on a 950 pound boiler

Answer 25

2 one every 500 pounds (1175 lb has 3)

Question 26

Solenoid on circuit diagram

Answer 26

Looks like this with the bumps Or looks like a coil or loops because its a coil

Question 27

area of circle and circumference formulas and pi

Answer 27

A= πr^2 C= 2πr π= 3.141

Question 28

Flammability and toxicity of B2 refrigerant

Answer 28

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

Question 29

Pool well mixed water test sample

Answer 29

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

Question 30

Max turnover rate for main pool

Answer 30

8 hours

Question 31

2 types of packing

Answer 31

mechanical seal and packing gland

Question 32

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

Answer 32

caviation

Question 33

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

Answer 33

Warn bearings or broken packing ring

Question 34

Why should you never use compressed air in refrigeration lines

Answer 34

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

Question 35

what should you do first if you see an oil spill

Answer 35

Contain if possible OR notify engineering

Question 36

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

Answer 36

High Voltage use

Question 37

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

Answer 37

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

Question 38

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

Answer 38

lower when temperature rises

Question 39

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

Answer 39

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

Question 40

what type of metal is a wire rope made of

Answer 40

galvanized or stainless steel

Question 41

What is the spacing between the grinding wheel and pad

Answer 41

1/8th of an inch

Question 42

max temp for a spa

Answer 42

104 degree

Question 43

electric symbol for switch DPST or SPDT

Answer 43

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

Question 44

HVAC piping symbol

Answer 44

circle with an X in it

Question 45

What would be the main cause of stopping a boiler

Answer 45

high opacity

Question 46

3 types of lubricant feed systems

Answer 46

gravity, forced, ???

Question 47

What type of grease for A100 bearing

Answer 47

high maybe