Test 2 Flashcards
The minimum required clearance from overhead high-voltage (600-50,000 V) conductors for boom-type lifting or hoisting equipment being dismantled is:
A. 4' B. 6' C. 7.5' D. 10'
D. 10’
The minimum required clearance from overhead high-voltage (600-50,000 V) conductors for boom-type lifting and hoisting equipment in transit is:
A. 4' B. 6' C. 7.5' D. 10'
B. 6’
When do the required clearances from overhead high-voltage conductors not apply?
A. when the overhead lines are on private property B. when the power company installs the lines C. when the overhead electrical distribution and transmission lines have been de-energized and visibly grounded. D. when the power lines are in a wooded area
C. when the overhead electrical distribution and transmission lines have been de-energized and visibly grounded.
How often should the boom-angle indicator on a crane be inspected?
A. every day B. every week C. every month D. every year
A. every day
What is the minimum distance a metal ladder should be from exposed energized electrical parts?
A. do not use a metal ladder B. 4' C. 6' D. 10'
A. do not use a metal ladder
Non-metal ladders should be kept 6’ away.
What is the longest length ladder approved by Cal/OSHA?
A. 34' B. 44' C. 48' D. 50'
B. 44’
How often should a fire extinguisher be maintained and tested?
A. every 6 months B. every year C. every 18 months D. every 2 years
B. every year
If a person is electrocuted, the most likely appropriate response is to:
A. administer CPR B. give a lumbar massage C. administer Heimlich maneuver D. attempt to get the victim to drink water
A. administer CPR
Where must you provide a disconnecting means in circuits of any voltage?
A. on the supply side of cartridge fuses B. at the service drop C. within 10 feet of the panel D. a disconnecting means is not required
A. on the supply side of cartridge fuses
Which of the following colors may not be used for current-carrying wires?
A. black B. white C. red D. green
D. green
Green = ground
Which of the following types of conductors may be used as an overhead feeder to a garage?
A. THHN B. THWN C. MTW D. UF
B. THWN
Treat all burns with:
A. cool water B. milk C. baking soda D. ointments or salves
A. cool water
A gentle flow of cool water: Too forceful a flow will cause damage to the burned tissue.
The symptoms of shock are:
A. cool, sweaty, pale, and bluish skin B. rapid and weak pulse and shallow breathing C. nausea, vomiting, and dizziness D. all of the above
D. all of the above
For a 125-amp main service panel, what size and how many wires would be connected to a 100-amp sub-panel?
A. three No. 4 Al B. three No. 6 Cu C. four No. 4 Al D. four No. 2 Cu
D. four No. 2 Cu
Which of the following types of extinguishers is most effective on an electrical fire?
A. high-pressure water B. sand C. dry powder (carbon dioxide) D. carbon tetrachloride
C. dry powder (carbon dioxide)
If current leads the voltage in an AC circuit, which of the following would be the most likely cause?
A. resistance B. inductive reactance C. capacitive reactance D. inductive capacitance
C. capacitive reactance
Capacitive reactance is another name for the opposition set up by a capacitor to AC or pulsating DC current. “Current leads the voltage” means that the peak of the current wave occurs before the peak of the voltage wave.
The ideal power factor is:
A. 0.0 B. 0.1 C. 1.0 D. 1.2
C. 1.0
A unity (1.0) power factor is achieved when the current and voltage are exactly in phase. That is, the peaks of current and voltage occur at the same time.
If current leads the voltage in an AC circuit, which of the following would be the most likely cause?
A. resistance B. inductive reactance C. capacitive reactance D. inductive capacitance
C. capacitive reactance
Capacitive reactance is another name for the opposition set up by a capacitor to AC or pulsating DC current. “Current leads the voltage” means that the peak of the current wave occurs before the peak of the voltage wave.
If current lags behind the voltage in an AC circuit, which of the following would be the most likely cause?
A. resistance B. inductive reactance C. capacitive reactance D. conductive reactance
B. inductive reactance
Inductive reactance is the opposition set up by an inductor to the flow of AC or pulsating DC current. “Current lags behind the voltage” means that the peak of the current wave occurs after the peak of the voltage wave.
Given a circuit with equal inductive reactance and capacitive reactance, what happens when you modify either reactance?
A. inductance increases B. inductance decreases C. power factor increases D. power factor decreases
D. power factor decreases
Inductive and capacitive reactance act in opposition to keep a circuit in phase–i.e., to balance out current lag and current lead. If one type of reactance is changed in a balanced circuit, the power factor will decrease because the circuit will become out-of-phase.
In an inductive reactance circuit, adding capacitive reactance will:
A. decrease power factor B. decrease efficiency C. increase true power D. increase apparent power
C. increase true power
If capacitive reactance is added to an inductive reactance circuit, the circuit will come more into phase, which will increase the power factor. If the power factor increases, then true power will increase relative to apparent power.
In a circuit less than 50 volts, the minimum size receptacle for a hand-held 4-volt lamp is:
A. 10 amps B. 15 amps C. 20 amps D. 30 amps
B. 15 amps
The amperage rating for No. 6 RH cable at 20°C ambient is:
A. 55 amps B. 65 amps C. 70 amps D. 85 amps
B. 65 amps
At up to 30°C ambient temperature, No. 6 RH cable is rated at 65A. The ampacity increases as temperature decreases, and at 20°C the wire is technically rated at 68.25A. However, since this was not offered as an answer choice, 65A is the best option.
How do you connect electrical cable to a box?
A. electrical connectors B. set screws C. electrical tape D. fish tape
A. electrical connectors
