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

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.

Multiple choice

Which of the following is a type of electrical machine?

  1. Generator

  2. Motor

  3. Transformer

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

Generator, motor, and transformer are all types of electrical machines.

Multiple choice

How can you prevent your drone's battery from overheating?

  1. Avoid flying in hot weather

  2. Land the drone frequently to allow the battery to cool down

  3. Use a battery with a higher capacity

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

All of these measures help prevent battery overheating.

Multiple choice

Which of the following is NOT a type of heat exchanger?

  1. Shell-and-tube heat exchanger

  2. Plate-and-frame heat exchanger

  3. Double-pipe heat exchanger

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

A regenerator is not a type of heat exchanger because it does not transfer heat between two fluids.

Multiple choice

Heat exchangers are devices used to:

  1. Transfer heat between two fluids

  2. Generate electricity

  3. Cool electronic components

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

Heat exchangers are devices used to transfer heat between two fluids.

Multiple choice

Which of the following is a common type of heat exchanger?

  1. Shell-and-tube heat exchanger

  2. Plate-and-frame heat exchanger

  3. Finned-tube heat exchanger

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

All of the given options are common types of heat exchangers.

Multiple choice

Which of the following is NOT a type of plasma source?

  1. DC glow discharge

  2. Radio frequency discharge

  3. Microwave discharge

  4. Laser-induced plasma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Laser-induced plasma is not a type of plasma source. It is a technique for generating plasma using a laser.

Multiple choice

Which type of plasma source is commonly used in the generation of high-power plasma jets?

  1. DC glow discharge

  2. Radio frequency discharge

  3. Microwave discharge

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

Pulsed plasma sources are commonly used in the generation of high-power plasma jets due to their ability to produce short, intense pulses of plasma.

Multiple choice

Which of the following is an example of an energy-efficient industrial process in the mining sector?

  1. Using energy-efficient lighting

  2. Using energy-efficient motors

  3. Using energy-efficient heating and cooling systems

  4. Using energy-efficient equipment
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using energy-efficient equipment is an example of an energy-efficient industrial process in the mining sector.

Multiple choice

Which of the following is an example of an energy-efficient industrial process in the transportation sector?

  1. Using energy-efficient lighting

  2. Using energy-efficient motors

  3. Using energy-efficient heating and cooling systems

  4. Using energy-efficient vehicles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using energy-efficient vehicles is an example of an energy-efficient industrial process in the transportation sector.

Multiple choice

Which of the following is NOT a type of automotive battery?

  1. Lead-acid battery

  2. Lithium-ion battery

  3. Nickel-cadmium battery

  4. Flow battery
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Flow batteries are not commonly used in automotive applications due to their larger size and complexity compared to other battery types.