Electrical 1
Electrical Safety Quiz
Test your knowledge on electrical safety procedures and precautions with this comprehensive quiz designed for professionals and enthusiasts alike. Ensure you have a firm grasp on essential safety measures when working with high voltage circuits and electrical equipment.
This quiz covers:
- High voltage circuit safety
- Fire safety procedures
- Proper use of electrical tools
- Responding to electrical incidents
When working on a high voltage circuit, you should always have another person present with you. This person should have a good working knowledge of __________.
The circuit being worked on and the location of all switches and circuit breakers controlling it
First-aid techniques for treating electrical shock
Cardiopulmonary resuscitation (CPR
All of the above
Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component?
Wear rubber gloves and boots.
Open the supply circuits and tag the switches.
Use only approved non-conducting tools.
Ground the case of the machine before beginning any repairs.
Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?
De-energize the applicable switchboard bus.
Station a man at the circuit supply switch.
Bypass the interlocks.
Secure and tag the supply circuit breaker in the open position.
When maintenance personnel are working on electrical equipment, all supply switches should be secured in the open position and tagged specifically by the __________.
Watch engineer
Person performing the repair
Chief engineer or first assistant
Chief electrician
When working on electrical circuits containing large capacitors, in addition to de-energizing the circuit, which of the listed precautions should also be taken?
Keep all radio equipment away.
Check capacitor circuit polarity.
Measure capacitor insulation resistance.
Ground the capacitor terminals.
Before touching a small capacitor connected to a de-energized circuit, or even one that is completely disconnected, you should __________.
Gently tap the body with a screwdriver
Short circuit the terminals to make sure that the capacitor is discharged
Tag it with a de-energized tag
Be equipped with an insulated fuse puller
When working on a high voltage circuit, you should always have another person present with you. This person should have a good working knowledge of the hazards associated with working on high voltage electrical circuits as well as first aid techniques for treating electrical shock. What other knowledge is essential?
Working knowledge of the circuit being worked on and all means of isolation and gounding.
Detailed knowledge of the insulation voltage ratings associated with the circuit being worked on.
Detailed knowledge of insulation, dielectric strengths associated with the circuit being worked on.
Working knowledge of the conductor amapacities associated with the circuit being worked upon
Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?
De-energize the applicable switchboard bus.
Station a man at the circuit supply switch.
Bypass the interlocks.
Secure and tag the supply circuit breaker in the open position.
Most fatalities from electrical incidents occur from which common shipboard voltage?
24 VDC
460 VAC
115 VAC
230 VAC
Arc Flash will occur from electrical incidents from which common shipboard voltage?
24 VDC
460 VAC
115 VAC
230 VAC
To extinguish an electrical fire, you should use __________.
Mechanical foam
Soda acid
Chemical foam
Carbon dioxide
To use a portable CO2 fire extinguisher, you must FIRST __________.
Turn the tank upside down
Shake thoroughly
Pull the locking pin
Open the valve on the side of the tank
In which of the circumstances listed would a carbon dioxide fire extinguishing agent be most effective?
Within a closed space
As a cooling agent
On a magnesium fire
At a range of 15 feet
Which of the following statements describes the correct method to use when applying CO2 from a portable fire extinguisher?
Bounce the CO2 off the bulkhead.
Direct the CO2 in as near a vertical upward direction as possible.
Apply CO2 to the base of the flames in a sweeping motion.
Apply the CO2 to the top of the flames with a beating motion.
What danger to personnel exists when a carbon dioxide fire extinguisher is discharged in a small enclosed space?
Second degree burns
Burst eardrums
Electric shock
Suffocation
The MAIN objection to the use of a dry chemical fire extinguisher on an electrical fire is that the __________.
Extinguishing action is not as good as with soda acid
Extinguisher will need to be recharged
Powder conducts electricity back to the fire fighter
Dry chemical leaves a powder residue which may render electrical equipment inoperative
The best way to effectively use a dry chemical type fire extinguisher in fighting a fire, is to __________.
Discharge a stream horizontally and allow it to flow down evenly on all burning surfaces
Use concentrated amounts in small locations and put the fire out in sections
Discharge a stream at the base of the fire, starting at the near edge, and use side-to-side sweeping motions
Play the stream off adjacent vertical surfaces until the area is blanketed
Which of the following statements represents the correct action to take when three crew members discover a fire?
One man report the fire, and the other two men fight the fire.
All three men fight the fire and report it immediately after it is extinguished.
One man report the fire, one man fight the fire, and one man evacuate and secure the area.
One man report the fire, one man fight the fire, and one man act as a safety observer.
Which of the listed fire extinguishers cannot be easily recharged aboard ship?
Soda acid
Foam
Carbon dioxide
Dry chemical, cartridge-operated
If a portable carbon dioxide fire extinguisher has been partially discharged, it should be immediately __________.
Tagged and restowed properly in its rack
Tagged 'empty' and stowed separately from charged extinguishers
Weighed and the charge loss recorded before being returned to its rack
Given to the chief engineer for recharging
Which of the following statements is correct regarding the use of a multimeter when directly measuring current?
The indicating needle is deflected from left to right regardless of polarity.
You should always start with the lowest range until a suitable reading is obtained.
It must be connected in series with the circuit.
An external shunt is generally utilized where current is less than 10 amperes.
To properly use a hook-on-type volt/ammeter to check current flow, you must FIRST __________.
Connect the voltage test leads to the appropriate terminals
Hook the jaws of the instrument around the insulated conductor
De-energize the circuit to allow connection of the instrument in series
Short the test leads and calibrate the instrument to zero
A multimeter can be used to measure __________.
Current
Voltage
Resistance
All of the above
A multimeter may be damaged by taking a __________.
Resistance reading while in the ammeter mode
Current reading while in the voltmeter mode
Voltage reading while in the resistance mode
Resistance reading while in the voltmeter mode
When used for taking resistance measurements, a volt-ohm-milliammeter is normally powered by __________.
The current in the circuit being tested
Internal storage batteries
A hand cranked generator
A step down transformer
Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?
Average value
Root-mean-square value
Peak value
Maximum value
An ohmmeter can be used to measure __________.
Circuit continuity
Voltage between two points in a circuit
The amount of current flow in a circuit
Circuit power
If you disconnect and arrange both ends of a three conductor cable, without any contact between the individual conductors, a low ohmic value between the ends of a single conductor would indicate __________.
The presence of a partial ground
An infinite resistance
Continuity of the conductor
That the conductor is not short circuited
While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an ohmmeter is to be used to check its value?
Resistor's circuit must be de-energized and at least one end of the component isolated.
Meter leads must not be twisted so as to cancel out the individual magnetic fields.
Correct polarity must be observed because reverse bias will damage the component.
The meter case must be grounded prior to attaching the leads.
To properly use a megohmmeter, you must FIRST __________.
Connect the test leads to the appropriate terminals
Connect one test lead to ground and the other to the outside of the insulated conductor
De-energize the circuit before connecting the leads.
Short the test leads and calibrate the instrument to zero
A low-voltage protection circuit is used in electric motor starting equipment to __________.
Prevent the motor from restarting automatically on restoration of voltage
Trip circuit contactors when the motor develops a short circuit due to low voltage
Allow the motor to restart automatically on restoration of voltage without manually resetting
Trip circuit contactors when the motor overspeeds due to low voltage
Low Voltage Release protection as used in some shipboard motor starter and control equipment will have which of the following characteristics?
They allow the motor to restart upon restoration of normal voltage.
They require manual resetting upon restoration of normal voltage.
They use a phase sensitive relay to trip contacts in series with the holding coil of the starter.
They trip circuit contactors when the motor starts to overspeed
The main difference between a motor control circuit containing low voltage release and low voltage protection is that the latter contains __________.
A momentary-contact start button
Normally open line contacts
Thermal-overload protection
A magnetic operating coil
An across-the-line starter is typically used for which of the following applications?
Full-voltage starting of motors
Low torque starting of small motors
Low resistance starting of DC motors
Reduced-current starting of large motors
Across-the-line starters are used with AC motors to provide __________.
Controlled starting acceleration
Regulated starting current
High starting torque
Reduced starting current
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