Electrical Installation & Maintenance MCQ Test-03

#1. In a three phase, delta connection

line current is equal to phase current

Line voltage is equal to phase voltage

None of the above

Line voltage and line current is zero

A delta connected AC circuit is achieved by connecting the start end of a winding to the finish end of another winding such that all three windings form a mesh. Since each end of the windings forms the line connection, voltage across each winding is equal to the potential difference between the corresponding lines taken from that winding. Hence the phase voltage is equal to the line voltage.

#2. In a three-phase system, the current passing through any two lines of supply is called …..

phase voltage

Phase current

line current.

line voltage

Explanation:

Line current:

Represents the current flowing through a single line connecting the power source to the load.
Phase current:

Represents the current flowing through one phase of the three-phase system.

Key point: In a star connection, the line current is equal to the phase current.

#3. A group of people working with common objectives or goals is known as a _

a) Team

b) Teamwork

c) Group

d) Club

Explanation: A group of people working with common objectives or goals is known as a team. A team needs to inculcate teamwork. An empowered team showing teamwork is the characteristic of a successful organization.

#4. Which of the following is not a benefit of teamwork?

a) Improved solutions to quality problems

b) Improved ownership of solutions

c) Improved communications

d) Decline in integration

Explanation: Improved solutions to quality problems, improved ownership of solutions, improved communications and improved integration are benefits of teamwork. A team with teamwork also faces fewer problems in the future.

#5. Which of the following is not a classification of a team?

a) Process improvement team

b) Cross-functional team

c) Natural work team

d) Group-directed/group-managed work team

Explanation: Process improvement team, cross-functional team, natural work team, and self-directed / self-managed work team are four major classifications of a team. Every organization needs a team to attain success and teamwork must be paramount in it.

#6. The team which focuses its attention on improvements of a process that is already operating to a satisfactory level is called the

a) Process improvement team

b) Cross-functional team

c) Natural work team

d) Group-directed/group-managed work team

Explanation: The team which focuses its attention on improvements of a process that is already operating to a satisfactory level is called the Process improvement team. The other types of teams are Cross-functional teams, Natural work teams, and Self-directed / self-managed work teams.

#7. Cross-functional teams are _______

a) Temporary

b) Permanent

c) Neither Temporary nor Permanent

d) Either Temporary or Permanent

Explanation: Cross-functional teams are temporary. They are formed by certain organizations to solve complex problems. Six to ten members are selected from various functional areas of management to constitute cross-functional teams.

#8. What is the primary purpose of a circuit breaker?

a) To regulate voltage

b) To protect against overcurrents

c) To measure power consumption

d) To control lighting levels

Solution: b) Circuit breakers are designed to interrupt the flow of electricity when an overcurrent or short circuit occurs, preventing fires and electrical damage.

#9. What is the purpose of an electrical ground wire?

a) To carry current to appliances

b) To provide a path for fault currents

c) To regulate voltage

d) To reduce power consumption

Solution: b) The ground wire provides a safe path for fault currents to return to the ground, preventing electrical shocks.

#10. What is the purpose of a junction box?

a) To house electrical connections

b) To mount light fixtures

c) To install circuit breakers

d) To measure voltage

Solution: a) Junction boxes provide a safe enclosure for electrical connections/joints.