Electrical Systems in Buildings: Multiple Choice Quiz

Question 1

Which of the following is NOT an electrical system used in buildings?

Accepted Answer

Pneumatic system

Answer

AC system

Answer

DC system

Answer

Three-phase system

Question 2

What is the main function of a circuit breaker in an electrical system?

Accepted Answer

Protect the circuit from excessive current

Answer

Control the flow of electricity

Answer

Store electrical energy

Question 3

Which of the following is **not** a type of electrical system used in commercial buildings?

Accepted Answer

HVAC

Answer

Lighting

Answer

Power

Answer

Security

Question 4

What is the primary purpose of using a circuit breaker in an electrical circuit?

Accepted Answer

To protect the circuit from overcurrent

Answer

To provide a convenient way to switch off the circuit

Answer

To regulate the voltage in the circuit

Answer

To store electrical energy

Question 5

Which of the following materials is known to be a good conductor of electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 6

What is the SI unit of electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 7

What is the main purpose of using a transformer in an electrical system?

Accepted Answer

To change the voltage level

Answer

To isolate circuits

Answer

To protect against overcurrent

Answer

To store electrical energy

Question 8

Which of the following is NOT a type of electrical system commonly used in buildings?

Accepted Answer

Plumbing system

Answer

Power distribution system

Answer

Lighting system

Answer

Fire alarm system

Question 9

What is the primary function of a lighting system in a building?

Accepted Answer

To provide adequate illumination for occupants

Answer

To regulate the temperature of the building

Answer

To detect and extinguish fires

Answer

To distribute power to electrical equipment

Question 10

What is the primary purpose of a transformer in an electrical system?

Accepted Answer

To change voltage levels

Answer

To isolate circuits

Answer

To regulate current flow

Answer

To protect against overloads

Question 11

Which type of lighting is generally known for its high energy efficiency and long lifespan?

Accepted Answer

LED

Answer

Incandescent

Answer

Fluorescent

Answer

Halogen

Question 12

What is the key role of a transformer in an electrical system?

Accepted Answer

Changing voltage levels

Answer

Converting AC to DC

Answer

Isolating circuits

Answer

Improving power factor

Question 13

How does power factor impact the efficiency of an electrical system? Which common method can be used to improve it?

Accepted Answer

Adding capacitors to the system can enhance power factor.

Answer

A higher power factor reduces system efficiency.

Answer

Power factor has no effect on system efficiency.

Question 14

Which safety measure is crucial before working on electrical systems?

Accepted Answer

Turn off the power supply

Answer

Use a ladder to reach high components

Question 15

In the context of residential buildings, which type of electrical system is most commonly employed?

Accepted Answer

Single-phase AC system

Answer

Three-phase AC system

Answer

Direct current system

Answer

Alternating current system

Question 16

What is the key difference between a fuse and a circuit breaker?

Accepted Answer

Circuit breakers can be reset, while fuses cannot

Answer

Fuses are reusable, while circuit breakers are not

Answer

Circuit breakers are more expensive than fuses

Answer

Fuses provide better protection against overloads

Question 17

Which of the following is NOT a typical electrical system used in buildings?

Accepted Answer

Hydraulics

Answer

Lighting

Answer

Fire alarm and detection

Answer

Heating, ventilation, and air conditioning (HVAC)

Question 18

Which of the following performance characteristics is critical for electrical systems in hospitals?

Accepted Answer

Reliability

Answer

Efficiency

Answer

Aesthetics

Answer

Cost-effectiveness

Question 19

What is the primary purpose of a circuit breaker in an electrical system?

Accepted Answer

To protect the circuit from overcurrent

Answer

To regulate voltage

Answer

To improve power factor

Answer

To isolate faulty components

Question 20

Which of the following wiring methods is typically used for concealed installations in walls?

Accepted Answer

Conduit

Answer

Busway

Answer

Surface raceway

Answer

Cable tray

Question 21

What is the purpose of earthing in an electrical system?

Accepted Answer

To provide a low-resistance path for fault currents

Answer

To reduce electromagnetic interference

Answer

To improve voltage stability

Question 22

Which of the following is NOT a type of electrical system commonly used in buildings?

Accepted Answer

Pneumatic system

Answer

Communication system

Answer

Lighting system

Answer

Power system

Question 23

Which of the following is a key performance characteristic of an electrical system that measures its effectiveness in converting input energy into useful output?

Accepted Answer

Efficiency

Answer

Cost

Answer

Aesthetics

Answer

Durability

Question 24

Which of the following is a typical application of an electrical system in a residential building?

Accepted Answer

Providing power to lighting fixtures

Answer

Monitoring the security of the building

Answer

Controlling the flow of water in pipes

Answer

Regulating the temperature of the building

Question 25

Which of the following steps is typically involved in the design of an electrical system?

Accepted Answer

Calculating the electrical load

Answer

Testing the electrical system

Answer

Maintaining the electrical equipment

Answer

Installing the electrical wiring

Question 26

Which of the following is a code requirement for the installation of electrical systems in buildings that ensures the appropriate size of electrical conductors is used?

Accepted Answer

Using proper wire sizes

Answer

Installing all electrical equipment in a visible location

Answer

Matching the color of the wires to the circuit

Answer

Using the same type of electrical box for all applications

Question 27

Which of the following is a key benefit of using a structured wiring system for an electrical system?

Accepted Answer

Increased flexibility

Answer

Reduced cost

Answer

Improved reliability

Answer

Enhanced security

Question 28

Which of the following is a type of lighting control system that uses sensors to detect occupancy and adjust lighting levels accordingly?

Accepted Answer

Occupancy sensor

Answer

Voltmeter

Answer

Circuit breaker

Answer

Transformer

Question 29

Which of the following is an advantage of using a solar photovoltaic system to generate electricity for a building?

Accepted Answer

Reduced operating costs

Answer

Higher maintenance requirements

Answer

Increased power outages

Question 30

Which of the following is a recommended practice for maintaining an electrical system?

Accepted Answer

Regularly inspecting and testing the system

Answer

Using electrical appliances that are not properly grounded

Answer

Ignoring any warning signs or symptoms of electrical problems

Answer

Never touching any electrical equipment