Electrical #1
Before you can avoid and control electrical hazards you must first ___________?
A. Recognize them
B. Mitigate them
C. List them
D. Understand them
A. Recognize them
In an AC unit, dirty air filters will cause
A. Low suction pressure
B. High suction pressure
C. High discharge pressure
D. Low oil pressure
A. Low suction pressure
What PPE will always be worn in the shop area?
What is "Safety Glasses"?
GFCIs detect any difference in __________ between two circuit wires (the black wires and white wires).
A. Impedance
B. Voltage
C. Current
D. Resistance
C. Current
The reversing valve is commonly used
A. When the code requires a check valve
B. On commercial systems that involve two different temperatures
C. On all heat pumps
D. On multiple compressor systems
C. On all heat pumps
Electrical currents above ________ milliamperes may have a paralyzing or "freezing" effects on muscles.
A. 1
B. 10
C. 100
D. 1000
B. 10
Crankcase heaters are energized?
A. While the compressor is running
B. When the compressor is off
C. To prevent compressor freeze-up
D. To allow easy compressor start-up
B. When the compressor is off
What is the name of the federal agency that protects the health and safety of workers?
OSHA
Tripped circuit breakers and blown fuses show that __________?
A. The voltage is high
B. Too little resistance
C. Too much current is flowing
D. The a.c. frequency is too high
When brazing a line set, nitrogen is run through the piping to
A. Prevent combustibles in the line from exploding
B. Reduce oxidation on the brazed parts
C. Keep the pipe cool
D. None of the above
B. Reduce oxidation on the brazed parts
An electrical shock is received when electrical ________ passes through the body.
A. Current
B. Voltage
C. Resistance
D. Potential
A. Current
On a TXV, the purpose of an external equalizer is to?
A. Increase the pressure on top of the power head diaphragm
B. Balance the evaporator load
C. Compensate for a pressure drop across the evaporator coil
D. Allow a greater adjustment span
C. Compensate for a pressure drop across the evaporator coil
More than 800 people die in a work environment every year. With this in mind, how many of these deaths are the result of accidents involving falls?
A. 1 out of 4
B. 1 out of 3
C. 2 out of 7
D. 4 out of 5
B. 1 out of 3
What is the cause of more then half of all electrocutions?
A. Direct worker contact with energized powerlines
B. Improper transformer wiring
C. Defective power tools
D. Improperly grounded equipment
A. Direct worker contact with energized powerlines
If the suction pressure is low and the evaporator temperature high, the cause will be a?
A. Compressor suction valve stuck open
B. Starved evaporator
C. Too small evaporator
D. Overcharge
B. Starved evaporator
OSHA classifies any use of Electrical service ____________ as high voltage.
A. 50 volts or greater
B. Above 120 volts
C. Between 50 and 480 volts
D. Over 600 volts
D. Over 600 volts
On a central air conditioning system, a frosted suction line at the compressor inlet indicates?
A. Improper insulation at the suction line
B. Low back pressure
C. High humidity
D. Low load in the space
B. Low back pressure
Any worker can lockout or tagout a machine. True or false?
False
Ungrounded or "hot" electrical conductors are usually colored ___________?
A. Blue or Pink
B. Black or Blue
C. Black or Red
D. Red or Blue
C. Black or Red
What is the suction gas temperature of R-22 if the pressure is measured as 68 psig?
A. 68°F
B. 40°F
C. 117°F
D. 125°F
B. 40°F
Cardiac arrest, severe burns, and death is probable if a worker receives an electrical shock of ________?
A. 1 Microamp
B. 5 Milliamps
C. 2 Amps
D. 10 Amps
D. 10 Amps
What terminals on a conventional thermostat can be jumped to prove the circuit to the blower?
A. R and G
B. R and Y
C. R and W
D. R and C
A. R and G
While utilizing a ladder to gain rooftop access, how much should the ladder reach above the rooftop?
A. 1 Foot
B. 40 Inches
C. 20 Inches
D. 36 Inches
D. 36 Inches
The severity of injury from electrical shock depends on which two factors?
A. Resistance and Voltage
B. Current and Duration
C. Duration and Voltage
D. Resistance and Current
What component in a thermostat will cut off the heating unit before it reaches setpoint?
A. Bi-metal strip
B. Fan switch
C. Mercury bulb
D. Heat anticipator
D. Heat anticipator