#1
Which component is responsible for converting AC to DC in an electrical system?
Rectifier
ExplanationConverts alternating current to direct current.
#2
What is the function of a relay in an electrical control system?
To switch electrical circuits on or off
ExplanationControls the flow of electricity by opening or closing circuits.
#3
What is the primary function of a surge protector in an electrical system?
To protect against overvoltage spikes
ExplanationDiverts excess voltage to prevent damage to connected devices.
#4
What is the primary function of a transformer in an electrical system?
To change voltage levels in an alternating current circuit
ExplanationChanges voltage levels through electromagnetic induction.
#5
What is the primary purpose of a capacitor in a power factor correction system?
To improve power factor by supplying reactive power
ExplanationCorrects imbalances in reactive power to improve overall efficiency.
#6
What does the term 'Ohm's Law' define?
Voltage equals current multiplied by resistance
ExplanationDefines the relationship between voltage, current, and resistance.
#7
In a three-phase electrical system, how many degrees are there between each phase?
120 degrees
ExplanationThere are 120 degrees of phase separation between each phase.
#8
What is the primary purpose of a capacitor in an electrical circuit?
To store electrical energy temporarily
ExplanationStores and releases electrical energy as needed.
#9
What does the term 'PLC' stand for in the context of industrial automation?
Programmable Logic Controller
ExplanationComputerized device used to control machinery in industrial settings.
#10
What does the term 'SCADA' stand for in industrial automation?
Supervisory Control and Data Acquisition
ExplanationSystem for monitoring and controlling industrial processes.
#11
What is the purpose of a PID controller in a control system?
To regulate process parameters using proportional, integral, and derivative actions
ExplanationRegulates process parameters by adjusting proportional, integral, and derivative actions.
#12
Which of the following devices is used to protect electrical circuits from overcurrent?
Fuse
ExplanationProtects circuits by melting and breaking the circuit when current exceeds a certain limit.
#13
In a magnetic contactor, what is the role of the coil?
To generate magnetic force
ExplanationProduces a magnetic field to control the contactor's operation.
#14
What is the purpose of a VFD (Variable Frequency Drive) in motor control?
To control motor speed by adjusting the frequency of the electrical supply
ExplanationVaries the frequency and voltage to control motor speed.
#15
What is the role of a diode in an electrical circuit?
To allow current flow in one direction only
ExplanationConducts current in one direction while blocking it in the other.