Electrical 4
Mastering Electrical Principles Quiz
Test your knowledge of electrical principles with our comprehensive quiz designed for enthusiasts and professionals alike. Dive into questions covering motor circuits, lighting systems, and circuit protection.
- 35 challenging questions
- Multiple-choice format
- Instant feedback on answers
The variable resistance placed in the rotor circuit of a wound-rotor induction motor provides for __________.
Speed control
Frequency control
Voltage control
Use as a split-phase motor
What is the rotor speed of a four pole, 60 cycle, induction motor operating at full load with 3% slip?
270 RPM
540 RPM
873 RPM
1746 RPM
Incandescent lamps are classified according to _________________.
Shape of bulb and type of service
Size and style of base
Operating voltage and wattage
All of the above
Which of the following components are used to assemble a fluorescent lighting system?
Lamp
Starter
Ballast
All of the above
When a fluorescent lamp has reached the end of its useful life, it should be replaced immediately, or the resultant flashing may ____________.
Blow the lamp’s circuit
Explode, causing glass to fly in all directions
Short circuit the ballast transformer
Damage the starter and the ballast
During the start-up of the circuit shown in the illustration (EL-0081), it is noted that the ends of component “C” remain lighted but the tube does not illuminate. The cause of this problem is _____.
Component “A” is open
Component "D” is closed
Component “C” is the wrong wattage
Component "B” contacts are stuck closed
What is represented by the two parallel lines within component “A” of the circuit shown in the illustration (EL0-0081)?
A ground connection
An iron core
Ventilation openings
A mounting base
When changing out component “B” of the circuit shown in the illustration (EL-00841), It is important to know that ____________.
It is polarity sensitive and must be inserted as indicated on its base
There is a danger of phosphor poisoning should “B”’s bulb break
Component “D” must be closed during the replacement to provide the capacitor’s initial charge
It must match the circuit voltage and component “C” wattage
The illustration (EL-0081) shows a fluorescent light fixture. The ends of the lamp alternately glow and become dark, but the tube will not light. The most probably cause is that ______.
Component “D” is loose and due to the ship’s vibrations makes and breaks contact
The power system’s voltage is fluctuating in and out of the range necessary for proper operation
Component "A" is shorted and therefore unable to produce the high voltage required to start the lamp
Component “B” contacts are opening and closing thus prohibiting sufficient current flow
When replacing component “B” of the circuit shown in the illustration (EL-0081), it is important to know that_______.
It is polarity sensitive and must be inserted as indicated on its base
There is a danger of phosphor poisoning should “B”’s bulb break
Component “D” must be closed during the replacement to provide the capacitor’s initial charge
It must match the circuit voltage and component “C” wattage
Which component of the circuit shown in the illustration is the lamp? (Refer to EL-0081)
A
B
C
D
Which of the listed types of lighting circuits does the diagram shown in the illustration represent? (Refer to EL-0081)
High pressure sodium
Low voltage quartz
Mercury vapor
Standard fluorescent
What is indicated by gradual blackening at the ends of Component “C” shown in the illustration? (See EL-0081)
The unit is in danger of exploding
The tube is nearing the end of its useful life
The circuit voltage is too high
The circuit current is too low
The purpose of the capacitor within component “B” of the circuit shown in the illustration (EL-0081) is to ________.
Prolong the life of the components contacts
Discharge the neon within the envelope
Counteract the inductive reactance in the circuit
Store power to operate the circuit should “D” open
Which component of the circuit shown in the illustration (El-0081) is the starter?
A
B
C
D
During start-up of the circuit shown in the illustration (EL-0081) it is noted that the ends of component “C” alternately glow and become dark without the tube illuminating. The most probably cause for this is that _______.
Component “D” is loose and due to the ship’s vibrations makes and breaks contact
The power system’s voltage is fluctuating in and out of the range necessary for proper operation
Component “A” is shorted and therefore unable to produce the high voltage required to start the lamp
Component “B” contacts are opening and closing thus prohibiting sufficient current flow
When maintaining the circuit shown in the illustration (EL-0081), what dangers are associated with the component “C” should it become broken?
Glass fragments may cut a person’s skin
The contained mercury vapor is highly toxic
The inside coating of phosphor is highly poisonous
All of the above
Which component of the circuit shown in the illustration (EL-0081) is the ballast?
A
B
C
D
What is represented by the solid dots within components “B” and “C” in the diagram shown in the illustration? (See illustration EL-0081)
The fact that these parts are subject to wear and replacement
An indication that they are for 110 volt AC operation only
The particular components contain a gas such as neon or argon
All of the above
When a fluorescent lamp fails to light, the trouble can be in the __________.
Lamp
Starter
Ballast
All of the above
A tubular fuse should always be removed from a fuse panel with __________.
A screwdriver
A pair of insulated metal pliers
Any insulated object
Fuse pullers
A circuit breaker and a fuse have a basic similarity in that they both __________.
Can be reset to energize the circuit
Should open the circuit when overloaded
Will burn out when an over current flow develops
All of the above
A circuit breaker differs from a fuse in that a circuit breaker __________.
Melts and must be replaced
Is enclosed in a tube of insulating material with metal ferrules at each end
Gives no visual indication of having opened the circuit
Trips to break the circuit and may be reset
In a cartridge-type fuse, the metal element is contained in a __________.
Porcelain window
Thermal cut out
Fiber tube
Flasher device
Time delayed or delayed action-type fuses are designed to __________.
Prevent grounds in branch circuits
Prevent opens in motor circuits
Permit momentary overloads without melting
Guard lighting and electronic circuits
Fuses placed in series with a thermal trip-type circuit breaker are used for __________.
Time-delay protection
Short-circuit protection
Short duration surge protection
Sustained overload protection
Fuses are rated in __________.
Voltage
Amperage
Interrupting capacity
All the above
Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in __________.
Main lighting circuits
Motor starting circuit
Emergency lighting circuits
General alarm circuits
An "instantaneous-trip" type fuse will __________.
Open as soon as the load current exceeds its set point
Allow a preset delay between overcurrent and melting
Open a circuit by using a time delay element with a magnetic trip
Reset itself when the overcurrent is corrected
A fuse will blow for all the listed reasons EXCEPT __________.
Excessive vibration extremely hot surroundings
Loose fuse clips
Low contact
Resistance within the fuse
A circuit with a blown fuse would be described as a/an __________.
Short circuit
Open circuit
Bonded circuit
Grounded circuit
In the illustration the (EL-0033) component B is the __________.
Fixed contact
Moving contact
Arc extinguisher
Trip bar
In the illustration (EL-0033) the component C is the __________.
Fixed contact
Moving contact
Connection terminal
Trip bar
In the illustration (EL-0033), the component labeled D is a __________.
Fixed contact
Moving contact
Trip bar
Bimetallic strip
The position of the operating lever shown in 'X' of the illustraton (EL-0033) would be
The 'on' positon, meaning that the circuit is connected between the line & the load
The 'off' positon, meaning that the circuit is not connected between the line & the load
The 'tripped' positon, meaning that the circuit not connected between the line& the load
None of the above
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