Competency 7 part 2
Electrical Competency Quiz: Test Your Knowledge
Welcome to the Electrical Competency Quiz! This quiz is designed to assess your knowledge and expertise in various electrical concepts and practices. With 28 multiple-choice questions, you will have the opportunity to showcase your understanding of electrical systems, motor protection, and safety protocols.
Each question is carefully crafted to ensure a comprehensive evaluation of your skills. Get ready to challenge yourself!
- 28 multiple-choice questions
- Focus on electrical systems and safety
- Instant feedback on your answers
When changing tubular fuses always use a _______.
Rubber boots
Fuse puller
Electrician s plier
Screw driver
Air gap reading should be periodically taken for electrical generation equipment. The best tool to use to take these measurements is a ____.
Tapered, long blade gage
Inside micrometer
Dial indicator
Cloth (non-metallic) tape measure
What kind of device that has two pieces of metal joined together so that when its junction is heated, a voltage is produced?
Thermocouple
Strain gage
Proximity
Load cell
What would indicate ground in a particular phase 3- phase low voltage distribution system?
Dark or dim switchboard ground detecting light
Bright switchboard ground detecting light
Low switchboard watt meter
High switchboard watt meter
A device which can be used to check the calibration of a circuit breaker is a _______.
Clamp-on voltmeter
500 volt megohmmeter
Standard digital multimeter
Portable high current testing unit
The greatest single cause of electrical failure is _______.
Too frequent testing
Overcurrent
High inductance
The breakdown of insulation
When ship board electrical distribution circuit are connected in parallel, additional parallel circuits will cause the total circuit resistance to _________.
Increase, causing a decrease in the line voltage
Decrease, causing an increase in the line current
Decrease, causing an increase in the line voltage
Increase, causing a decrease in the line voltage
107. What is a device that converts fluid powers into linear mechanical force and motion that consists of a movable piston, connecting rod, and plunger operating in a cylindrical cavity?
Diaphragm
Actuator
Piston
Cylinder
What should be done to protect the rotor of a motor disassembled for maintenance or overhaul?
It must be stowed upright on its shaft
It must be stowed upright on its shaft
It must be supported by two “V” notched wood blocks
It must be returned to the frame as soon as the bearings are removed
What is the result if the solenoid coil burns on a cargo winch with an electrical brake?
The motor will overspeed and burn up
The brake will be set by spring force
The load suspended from the cargo boom will fall
Nothing will happen; the winch will continue to operate as usual
Two contributors of electronic console failures are heat and vibration. To combine some of their effect, preventive maintenance procedures should include _______.
Systematic rotation of circuit cards with those from spares to allow component cooling
Daily inspection of console foundation bolts
Periodic changing or cleaning of console ventilation and control room air conditioning filters.
All of the above
What precaution should be taken with a vessel’s impressed current cathodic protection system after a drydocking period during which the hull has been painted?
Reference cell voltages should be maintained at half at the normal range for approximately 48 hours
The unit should remain off for the specified amount of time so as not to disturb curing
A slight (10-15%) over current to the anodes should be allowed in order to speed drying
Output currents should be carefully monitored to assure operation at nearly 100% capacity for proper curing
The air gap provided an induction motor should be checked periodically with a feller gauge to detect_____.
Increase in apparent power factor
An increase in hysteresis loss
Any increase in rotor bearing wear
Any decrease in motor
What kind of instrument used to measure the specific gravity, or “charge” of the electrolyte of a storage battery?
Hydrometer
Multi tester
Pyrometer
Multi meter
How can you restore the charge of a lead-acid battery?
Passing an alternating electric current through the cell
By adding water to the electrolyte
Passing a direct electric current through the cell
Adding acid to the electrolyte
A safety device in an electrical circuit consisting of metal strip that melts when the current exceeds the safe level is called_____.
Fuse
Circuit breaker
Diode
Rheostat
What may happen to the components of a winch master control switch, if the cover gasket becomes deteriorated?
Contamination of lube oil
Sparking at the winch motor brushes
Overheating of the winch motor
Rapid corrosion of switch components
What is used in most for starting three-phase induction motors of five (5) horsepower or less?
Reactor starters
Across-the-line starters
Autotransformer starters
Resistor starters
What is a variable-resistance component used as a control device in electrical circuit?
Reactance
Potentiometer
Dimmner switch
Resistance
In an impressed current cathodic protection system, what is anode?
Insulated from the hull and does not waste away
Insulated from the hull but deteriorates with time
Connected to the hull but does not waste away
Connected to the hull and deteriorates with time
How will you remove a tubular fuse from a fuse panel with?
A screwdriver
Fuse pullers
Any insulated object
A pair of insulated metal pliers
Which of the listed precautions should be observed before spraying liquid solvent on the insulation of an electric motor?
Preheat the insulation to assist in cleaning
Disconnect the motor from the power source
Slow the motor down to low speed
Secure all ventilation in the are
What maximum voltage can Class 00 electrical insulating rubber gloves can be used?
1000 volts
6600 volts
7500 volts
500 volts
In using the Rheostat, what do you call the circuit of the motor to adjust the speed?
Induction motor with wound-rotor
Induction motor with squirrel gauge
Breaking motor with generator capability
Motor of synchronous type
What is the first step to properly use a hook-on-type volt/ammeter in checking current flow?
Short the test leads and calibrate the instrument to zero
Hook the jaws of the instrument around the insulated conductor
Connect the voltage test leads to the appropriate terminals
De-energize the circuit to allow connection of the instrument in series
The purpose of a motor under voltage protection device is to___.
Protect personnel from low voltage shock
Prevent high armature current when power is restored
Trip the load off the motor in case of fire
Start the motor at a very low voltage
What is a device that changes an input signal of one type into an output signal of a different type that is proportional to the original input?
Transducer
Controller
Web framed sensor
Transmitter
The purpose of a main switchboard circuit breaker’s reverse-power trip is to______.
Protect the circuit breaker blow out coil
Prevent alternator motorization
Prevent low voltage trip out
Prevent air circuit overload
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