Competeny 6 part 2
Synchronous Motor & Electrical Fundamentals Quiz
Test your knowledge on electrical engineering principles with our comprehensive quiz covering synchronous motors, AC circuits, and much more. Designed for professionals and students alike, this quiz will challenge your understanding of key concepts in electrical systems.
Join the ranks of skilled technicians and engineers by diving into a variety of topics including:
- Synchronous Motor Operations
- Electrical Measurements
- Control Systems
- Transformer Basics
- Power Generation
While starting a synchronous motor, the ammeter pegs out at maximum and then returns to the proper value after synchronization. What is this an indication of?
Field wildings are grounded
Power transmission cables are grounded
Slip rings are dirty
Motor has started properly
What do you call a directional lighting to emphasize an object or draw attention to part of the field view.
Accept lighting
Directional lighting
Flood lighting
Fumigation
In a circuit that is not energized which of the listed instrument is used?
Ohmmeter
Voltmeter
Clampmeter
Ammeter
The type of permanent magnets are normally made of?
Alnico alloy
Tin polarizer
Bronze equalizer
Coblat receptances
Which of the following is required onboard, to perform before any work on a high voltage equipment commences to ensure that any stored electrical energy in the inherent capacitance of the equipment insulation is safely discharge after isolation?
Tripping ACB
Dielectric
Open circuit
Earthing
What is the direction of the magnetic field in a conductor when current is flowing?
In a direction determined by the left hand rule
In a direction opposite to the current flow
In the same direction of the current
In all directionomni directional
What do you call a motor using a rheostat in the motor circuit to vary the speed?
Regenerative braking motor
Synchronous motor
Squirrel-cage induction motor
Wound-rotor induction motor
What do you call the emission of electrons from hot bodies?
Differential amplifier
Hall effect
Radiation effect
Peltier effect
In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness. When the test button is pushed, all lamps have equal illumination. You should called that _______.
The dark lamp must be replaced
There is a grounded on the line with the dark lamp
There are grounds on the lines with the bright lamps
All theses choices
What is the main reason in using an electronic megger tester essentially for polarization index or Pi test.
Because an electronic megger tester tester will give the most accurate reading
Because hand driven megger tester will not be able to give the steady test voltage for longer time
Because an electronic megger tester can handle higher voltage
Because electronic megger tester does not required battery of external source of energy to energize
Which of the following problems will most likely occur if the starting winding of a split-phase induction motor failed to cutout once the motor was in continuous operation?
The motor will run at a reduced speed
The motor will overspeed
A time delay will stop the motor
The winding will burn out
Which of the following values of the waveforms measured in ammeters and voltmeters?
Average value
Root means square value
Maximum value
Peak value
In process control terminology values can change without distinct increments, such as temperature, pressure or level are called ________.
Bumpless values
Analog values
Digital values
Binary values
Which prevents the entry of large objects to the pipeline and safeguards the internal parts of the pumps?
Suction Valve
Mud Box
Safety Valve
Perferated Plate
What represents as application of a silicon controlled rectifier?
Toi provide DC power for a main propulsion motor
For sensing flame in an automated burner
To eliminate power supply hum
For use as a voltage reference diode
To be considered as high voltage system used on board a ship, how much should be the minimum voltage?
500V
1500V
800V
1,000V
When trouble shooting electronic equipment, the first step to taken before testing the circuit voltage is to _______.
Remove the suspected component
Set the meter to the lowest range
Check the current flow through the circuit
Check the voltage supply from the power source
Which one of the following best describes the meaning of the term tracking when applied to high voltage electrical systems?
It is a current that flows within insulation layers
It is the noticeable current that flows through dirt on the surface of the insulation
It is the method of securing busbars within a switchboard
It is the method of separating busbars within a switchboard
What is the ratio of effective value of the counter EMF in volts to the effective value of the current in amperes?
Inductive capacitance
Relative efficiency
Inductive reactance
Efficiency drag
The first requirements for logical trouble shooting of any system in the ability to _______.
Identify the probable cause of a system
Collect all available data on a casualty
Isolate the faulty component
Recognize normal operation
The amount of sodium phosphate in treated boiler water can be measured by?
Alkalinity test
Phosphate test
Sodium phosphorous test
Chloride test
Identify factor that determines the frequency of an alternator?
Number of magnetic poles
Number of turns of wire in the armature coil
Strength of the magnets used
Output voltage
When the voltage and current developed in AC circuit reached their peak value, the power factor is?
Maximum
Leading
Minimum
Lagging
When trouble shooting most electronic circuits, “loading effect” can using a volt meter with a/an _______.
Sensitivity of more than 1000 ohms/volt
Input impedance much greater than the impedance across which the voltage is being measured
Input impedance much less than the impedance across which the voltage is being measure
Sensitivity of less than 1000ohms/volt
On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by?
Lowering the generator engine speed
Decreasing excitation
Raising the generator engine speed
Rotating brush alignment
What do you call a direct current passing through a wire coiled around a soft iron core?
Piezoelectric device
Electromagnetic domain
Electromagnet
Magnetic shield
The magnetic energy of a transformer when created will further induced current in the?
Positive pole
Negative pole
Secondary
Primary winding
What is the description in the source voltage in a parallel circuit?
Is applied directly across each branch
Is inversely proportional to each branch resistance
Causes the same amount of current to flow in each branch
Is inversely proportional to each branch current
Regarding and AC generator connected to the main electrical bus; as the electrical load and power factor vary, a corresponding change is reflected in the generator armature reaction are compensated for by the _____.
Governor speed droop setting
Balance coil
Phase-balance relay
Voltage regulator
Ships fitted with high-voltage installations tend to use earthed neutral electrical networks. Which one of the following best describes how excessive fault currents are prevented in the event of an earth fault on these ships?
Impedance is placed in each output cable from the generators
Impedance is placed in neural earthing line
The risk of earth fault is reduced by extra planned maintenance
Earth leakage circuit breakers are used on every circuit
It is defined as the movement of electrical charge (the flow of electrons) through an electrical circuit is called?
Watts
Voltage
Current
Magnetic field
Which one of the following is best described as the combinations disconnect switches and circuit breakers that are used to control, protect and isolate high-voltage electrical equipment?
Control Board
Starter Panel
Switchgear
Switchboard
What determines the power factor of an electrical distribution system being supplied by a single AC generator?
By prime mover speed
By output frequency
By components of the connected load
By generator’s rated voltage
The shunt use in an ammeter should be connected to?
Parallel with the load and in series with the meter movement
Parallel with the load and in parallel with the meter movement
Series with the load and in parallel with the meter movement
Series with the load and in series with the meter movement
What would you obtain if you measure voltage and current in an inductive or capacitive circuit and then multiply them together?
Power loss
True power
Differential amplifier
Apparent power
In a simple DC circuit, the resistance is held constant when the applied voltage is halved. Current flows therefore will ______.
Double
Remain the same
De devided by four
Be devided by two
In a cross-compound main propulsion unit, the astern turbine is usually INSTALLED WHERE?
High pressure end of the low turbine
High pressure end of the high pressure turbine
Low pressure end of the high pressure turbine
Low pressure end of the low pressure turbine
What is the part of a transformer which function is to deliver the load received?
Secondary winding
Rectifier
Primary winding
Core
Re-circulating of the feed water ensures a flow of water through?
Standby feed pump suction line
Main feed pump
Third stage heater
Economizer
To be considered as High Voltage system used on board a shop, how much should be the minimum voltage?
800V
1,000V
1,500V
5,000V
How do shipboard electrical cables cross-sectional area express?
Gage numbers
Circular mills
Centimeters
Millimeters
Which of the following may cause a single-phase induction motor fails to start?
A shorted shunt field
An open in the main winding
A closed centrifugal switch
Low circuit frequency
The capacitance is measured in?
Trectifier
Generator
Battery
Farads
What utilizes a pure transducer utilizes?
Proportion action
Rate action
Integral action
Derivative action
Which of the following statements concerning analog and digital devices are correct?
There are no basic differences between the two systems
Operations in a digital device are performed simultaneously
Analog devices are superior in accuracy compared to digital devices
The variables in digital systems are fixed quantities, and the variables in analog systems quantities
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