Introduction to Electrical Engineering MCQs (Part-14)
What is the purpose of signal processing in electrical systems?
A To modify signals
B To store energy
C To amplify signals
D To measure voltage
Signal processing involves manipulating electrical signals to improve their quality or extract useful information. It is used in communication systems, audio processing, and control systems to filter, enhance, or modify signals for desired outputs.
What is the main advantage of using renewable energy sources?
A High cost
B Lower efficiency
C Limited availability
D Non-polluting
Renewable energy sources, such as solar and wind power, are non-polluting, meaning they do not produce harmful emissions that contribute to environmental degradation. This makes them an environmentally friendly alternative to fossil fuels.
What does an inverter do in a solar power system?
A Regulates temperature
B Stores energy
C Converts DC to AC
D Measures power
An inverter is used in solar power systems to convert the direct current (DC) generated by solar panels into alternating current (AC), which is required for most household appliances and electrical grids.
What is the role of an electrical transformer?
A Convert electrical energy
B Change voltage level
C Increase current
D Decrease voltage
An electrical transformer is used to change the voltage level of alternating current (AC). It can step up (increase) or step down (decrease) the voltage, depending on the number of coils in the primary and secondary windings.
What is the basic principle behind renewable energy systems?
A Harness natural resources
B Increase pollution
C Use non-renewable resources
D Decrease energy output
Renewable energy systems harness natural resources like sunlight, wind, and water. These resources are constantly replenished and are used to generate energy in an environmentally sustainable manner, without depleting resources or contributing to pollution.
What is the main function of a filter in signal processing?
A Measure signal strength
B Amplify signals
C Remove unwanted frequencies
D Convert signals
A filter in signal processing is used to remove unwanted frequencies from a signal. This is crucial in applications like audio and communication systems where certain frequencies need to be eliminated to improve signal quality or prevent noise.
What does a photovoltaic (PV) cell do?
A Measures voltage
B Converts sunlight to electricity
C Stores electrical energy
D Converts sunlight to heat
A photovoltaic (PV) cell converts sunlight into electricity through the photovoltaic effect. When sunlight strikes the cell, it excites electrons, creating an electrical current that can be used to power devices or stored for later use.
Which of these is a type of electrical energy storage?
A Inductor
B Capacitor
C Resistor
D Battery
A battery stores electrical energy chemically and converts it to electrical energy when needed. It is a widely used energy storage system in both portable devices and larger energy storage applications like solar power systems.
What is the main objective of circuit analysis in electrical systems?
A Control power distribution
B Store energy efficiently
C Understand current flow and behavior
D Measure temperature
Circuit analysis helps engineers understand how current flows through electrical circuits, including voltage distribution and power consumption. It is essential for designing efficient circuits and troubleshooting problems in electrical systems.
What is the function of a capacitor in a power supply system?
A Increase resistance
B Store charge
C Regulate voltage
D Convert AC to DC
In a power supply system, a capacitor stores electrical energy in an electric field. It smooths out fluctuations in voltage and provides energy when needed, helping to stabilize the output of power supplies.
What is the main characteristic of an electrical circuit in parallel?
A Voltage is divided equally
B Total resistance increases
C Total current increases
D Current is the same everywhere
In a parallel circuit, the total current increases as more branches are added, while the voltage remains the same across each component. The total resistance decreases as additional parallel paths are provided for current to flow.
What does a rectifier do in an electrical system?
A Store energy
B Regulate current
C Convert AC to DC
D Increase voltage
A rectifier converts alternating current (AC) to direct current (DC) by allowing current to flow in only one direction. It is essential in power supplies for devices that require DC voltage, such as electronic circuits and batteries.
What is the purpose of a renewable energy system’s grid connection?
A Control energy generation
B Distribute energy to users
C Convert energy to power
D Store energy
Grid connection allows renewable energy systems, such as solar and wind power, to feed electricity into the public power grid. This enables the energy generated to be distributed to homes, businesses, and other users in the system.
What type of signal does an oscilloscope measure?
A Frequency
B Voltage
C Light
D Current
An oscilloscope measures the voltage signal as it varies over time. It displays the waveform of electrical signals, allowing engineers and technicians to analyze the behavior and characteristics of signals in electrical systems.
What is the primary function of a wind turbine in renewable energy systems?
A Convert wind to heat
B Convert wind to electricity
C Store wind energy
D Increase energy consumption
A wind turbine converts the kinetic energy of wind into mechanical energy, which is then converted into electricity. It is a key component in wind energy systems, contributing to renewable energy generation by harnessing natural wind power.