Introduction to Electrical Engineering MCQs (Part-13)
What is the primary function of electrical materials in circuits?
A Convert energy
B Conduct electricity
C Store energy
D Resist current
Electrical materials, such as copper and aluminum, are used to conduct electricity. They have low resistance and allow the flow of electrons through the material, which is essential for creating functioning electrical circuits.
What is the main purpose of engineering ethics in electrical engineering?
A Test electrical components
B Improve efficiency
C Ensure safety and compliance
D Design circuits
Engineering ethics ensure that engineers uphold safety, integrity, and compliance with legal standards in their work. In electrical engineering, ethics ensures safe practices, environmental responsibility, and the protection of public health and welfare.
What type of material is commonly used for electrical conductors?
A Copper
B Rubber
C Wood
D Glass
Copper is the most widely used material for electrical conductors due to its high electrical conductivity, low resistance, and ease of use. It allows efficient energy transmission, making it ideal for wiring and electrical components.
What does the term “electrical conductivity” refer to?
A Ability to insulate
B Ability to store charge
C Ability to conduct heat
D Ability to conduct electricity
Electrical conductivity is the ability of a material to allow the flow of electric charge. High conductivity materials, like metals, allow current to pass through easily, whereas materials with low conductivity, like wood, resist current flow.
What is the primary concern in electrical engineering ethics?
A Reducing cost
B Maximizing efficiency
C Ensuring safety and welfare
D Minimizing energy loss
Electrical engineering ethics focuses on ensuring safety, health, and welfare in engineering practices. Engineers must design and implement systems that protect the public, ensure environmental sustainability, and adhere to legal and professional standards.
Which material is considered an electrical insulator?
A Aluminum
B Rubber
C Silicon
D Copper
Rubber is an electrical insulator because it resists the flow of electrical current. It is commonly used as a protective coating for electrical wires and devices to prevent accidental shocks and short circuits.
What is the role of a semiconductor in a circuit?
A Increase voltage
B Store energy
C Convert current
D Control current flow
Semiconductors are used to control the flow of current in a circuit. Their conductivity can be adjusted by doping, allowing them to function as switches or amplifiers, making them essential in components like transistors and diodes.
What is the importance of insulation in electrical wiring?
A To reduce resistance
B To store electrical energy
C To prevent short circuits
D To conduct electricity
Insulation is crucial in electrical wiring because it prevents accidental contact with live wires and minimizes the risk of short circuits. It helps in ensuring the safety of both electrical systems and the people who interact with them.
What does “electrical resistance” in a material depend on?
A Its length and material
B Its temperature only
C Its voltage
D Its color
Electrical resistance depends on the material’s type, length, and cross-sectional area. Longer conductors and those made of materials with higher resistivity offer more resistance to the flow of electric current.
Which electrical component is used to store electrical energy?
A Inductor
B Capacitor
C Resistor
D Transistor
A capacitor stores electrical energy in the form of an electric field between two conductive plates. It can store and release energy rapidly, which is useful for smoothing power supplies and in timing applications in circuits.
What is the purpose of grounding in an electrical system?
A To measure resistance
B To increase voltage
C To provide a safe discharge path
D To reduce current
Grounding provides a safe path for electricity to flow into the earth in case of a fault, preventing electric shocks and reducing the risk of fire. It ensures that excess current has a controlled, safe path to dissipate.
What is the main reason for using copper in electrical wiring?
A Lightweight
B Low cost
C High resistance
D High conductivity
Copper is used for electrical wiring because of its high electrical conductivity. It allows for efficient current flow, minimizing energy loss and ensuring that power is transmitted effectively over long distances.
What is the main function of a diode in a circuit?
A Convert AC to DC
B Control voltage
C Amplify current
D Store energy
A diode allows current to flow in only one direction, converting alternating current (AC) to direct current (DC). This is crucial in applications like power supplies where DC is needed to run devices like computers and phones.
What is an example of passive electrical components?
A Diode
B Resistor
C Capacitor
D Transistor
Resistors are passive components in an electrical circuit. They do not require external energy to operate but simply resist the flow of current, converting electrical energy into heat to control the current flow.
What does “power factor” represent in an electrical system?
A The amount of energy used
B Voltage efficiency
C The ratio of real power to apparent power
D Current efficiency
Power factor represents the ratio of real power (used to perform work) to apparent power (total power supplied). A power factor of 1 indicates maximum efficiency, while a lower power factor means more energy is wasted in the system.