Science General ยท Physics

Energy and Electrical Devices

1,193 Questions

Energy and electrical devices focus on energy conversion, household electrical appliances, batteries, and electric vehicle technology. These principles are essential components of general science syllabi across major competitive examinations. Review these practice questions to strengthen understanding of electrical energy applications and devices.

Energy conversionHousehold electrical appliancesBatteries and cellsElectric vehicles

Energy and Electrical Devices Questions

Multiple choice

Which type of fuel cell is commonly used in automotive applications?

  1. Solid Oxide Fuel Cell (SOFC)

  2. Proton Exchange Membrane Fuel Cell (PEMFC)

  3. Alkaline Fuel Cell (AFC)

  4. Direct Methanol Fuel Cell (DMFC)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Proton Exchange Membrane Fuel Cells (PEMFCs) are widely used in automotive applications due to their high efficiency, relatively low operating temperature, and compact design.

Multiple choice

Which technology is used to store electrical energy in electric vehicles?

  1. Lithium-ion batteries

  2. Lead-acid batteries

  3. Nickel-cadmium batteries

  4. Solid-state batteries
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lithium-ion batteries are commonly used in electric vehicles due to their high energy density, long lifespan, and relatively low weight.

Multiple choice

Which type of electric vehicle uses an external power source to recharge its batteries?

  1. Battery electric vehicle (BEV)

  2. Plug-in hybrid electric vehicle (PHEV)

  3. Hybrid electric vehicle (HEV)

  4. Fuel cell electric vehicle (FCEV)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plug-in hybrid electric vehicles (PHEVs) can be recharged by plugging them into an external power source.

Multiple choice

Which type of alternative fuel vehicle uses a combination of an internal combustion engine and an electric motor?

  1. Battery electric vehicle (BEV)

  2. Plug-in hybrid electric vehicle (PHEV)

  3. Hybrid electric vehicle (HEV)

  4. Fuel cell electric vehicle (FCEV)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hybrid electric vehicles (HEVs) use a combination of an internal combustion engine and an electric motor to power the vehicle.

Multiple choice

Which of the following is NOT a type of zero-emission vehicle?

  1. Electric vehicles

  2. Hybrid vehicles

  3. Fuel cell vehicles

  4. Hydrogen vehicles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybrid vehicles are not zero-emission vehicles because they still rely on gasoline or diesel fuel to power the engine.

Multiple choice

Which of the following is NOT a common type of DER?

  1. Solar photovoltaic (PV) systems

  2. Wind turbines

  3. Electric vehicles (EVs)

  4. Combined heat and power (CHP) systems
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While EVs play a significant role in energy efficiency, they are not typically considered DERs due to their primary function as transportation rather than energy generation.

Multiple choice

Which technology is commonly used for energy storage in DER systems?

  1. Lithium-ion batteries

  2. Flow batteries

  3. Pumped hydro storage

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DER systems utilize various energy storage technologies, including lithium-ion batteries, flow batteries, and pumped hydro storage, depending on specific requirements and applications.

Multiple choice

What is the principle of operation of a pyroelectric sensor?

  1. Conversion of heat into electrical energy

  2. Conversion of mechanical energy into electrical energy

  3. Conversion of electrical energy into mechanical energy

  4. Conversion of magnetic energy into electrical energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pyroelectric sensors convert heat into electrical energy, generating a voltage or current proportional to the temperature change.

Multiple choice

Which of the following is NOT a component of a robot?

  1. Actuators

  2. Sensors

  3. Controller

  4. Power source
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Power source is not a component of a robot, but rather a requirement for its operation.

Multiple choice

Which of the following is NOT a type of marine engine?

  1. Diesel engine

  2. Steam turbine

  3. Gas turbine

  4. Electric motor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electric motors are not typically used as primary propulsion systems in marine applications.

Multiple choice

Which of the following is NOT an example of green technology in everyday life?

  1. Solar-powered street lights

  2. Electric vehicles

  3. Compost bins

  4. Traditional incandescent light bulbs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Traditional incandescent light bulbs are not considered green technology because they consume more energy and produce more heat compared to energy-efficient alternatives like LED lights.

Multiple choice

Which of the following is NOT a type of electric vehicle?

  1. Hybrid electric vehicle (HEV)

  2. Plug-in hybrid electric vehicle (PHEV)

  3. Battery electric vehicle (BEV)

  4. Internal combustion engine vehicle (ICEV)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Internal combustion engine vehicles (ICEVs) are powered by gasoline or diesel and are not considered electric vehicles.

Multiple choice

Which of the following is an example of a chemical propulsion system?

  1. Ion propulsion

  2. Nuclear propulsion

  3. Solar electric propulsion

  4. Solid rocket motor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A solid rocket motor is a type of chemical propulsion system that uses solid propellant to generate thrust.

Multiple choice

What is the term used to describe the amount of energy required to produce a unit of output?

  1. Energy efficiency

  2. Energy intensity

  3. Energy consumption

  4. Energy production
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Energy intensity refers to the amount of energy needed to produce a unit of output, such as a product or service.

Multiple choice

What is the term used to describe the amount of energy consumed by a device or system per unit of time?

  1. Energy efficiency

  2. Energy intensity

  3. Energy consumption

  4. Energy production
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Energy consumption refers to the amount of energy used by a device or system over a period of time.