Science General ยท Physics

Energy and Electrical Devices

1,182 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 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.

Multiple choice

What is the most common type of aircraft engine?

  1. Turbofan

  2. Turbojet

  3. Turboprop

  4. Piston
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The most common type of aircraft engine is the turbofan engine.

Multiple choice

What was the first major technological development to use electricity?

  1. telegraph

  2. telephone

  3. light bulb

  4. radio
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The telegraph was invented in the 1830s, before the telephone, light bulb, and radio.

Multiple choice

What is the primary mechanism of action of surgical lasers?

  1. Thermal energy

  2. Mechanical energy

  3. Chemical energy

  4. Electrical energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Surgical lasers work by delivering high-intensity light energy to the target tissue, causing it to heat up and vaporize.

Multiple choice

Which of the following is NOT a common type of electrical power source used in spacecraft?

  1. Solar Arrays

  2. Batteries

  3. Fuel Cells

  4. Nuclear Reactors
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nuclear reactors are not commonly used as a power source in spacecraft due to safety and complexity concerns.

Multiple choice

What is the primary mechanism of energy storage in latent heat storage systems?

  1. Sensible heat storage

  2. Latent heat storage

  3. Chemical energy storage

  4. Mechanical energy storage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Latent heat storage systems utilize the energy released or absorbed during phase changes of materials to store thermal energy.