Explore in-depth questions on the components of MCB to check your knowledge in electrical engineering and circuit breakers.
Components of MCB
This electrical engineering video focuses on the detailed explanations for the MCB components related questions.
Question 1
What component in an MCB is responsible for detecting overloads?
A. Tripping mechanism
B. Magnetic coil
C. Arc chute
D. Bimetallic strip
Show the Answer
Bimetallic strip
Question 2
Which component of an MCB helps in extinguishing the arc formed during tripping?
A. Magnetic coil
B. Arc chute
C. Operating lever
D. Arc strip
Show the Answer
Arc chute
Question 3
What is the primary function of the magnetic coil in an MCB?
A. Detecting short circuits
B. Operating the manual switch
C. Extinguishing arcs
D. Detecting overloads
Show the Answer
Detecting short circuits
Question 4
What role does the tripping mechanism play in an MCB?
A. Interrupting the circuit
B. Connecting to the load
C. Detecting short circuits
D. Manual operation
Show the Answer
Interrupting the circuit
Question 5
Which part of an MCB provides insulation between the internal components and the external environment?
A. Casing
B. Magnetic coil
C. Tripping mechanism
D. Arc chute
Show the Answer
Casing
Question 6
What component in an MCB is responsible for rapidly disconnecting the circuit in the event of a short circuit?
A. Magnetic coil
B. Tripping mechanism
C. Bimetallic strip
D. Arc chute
Show the Answer
Magnetic coil
Question 7
How does the bimetallic strip in an MCB detect an overload condition?
A. By generating a magnetic field
B. By manual operation
C. By bending due to heat
D. By cooling the arc
Show the Answer
By bending due to heat
Question 8
Which component ensures the MCB can be safely reset after tripping?
A. Operating lever
B. Magnetic coil
C. Arc chute
D. Bimetallic strip
Show the Answer
Operating lever
Question 9
What is the primary material used for the casing of an MCB?
A. Metal
B. Rubber
C. Plastic
D. Glass
Show the Answer
Plastic
Question 10
Which component in an MCB is used to manually turn the circuit breaker on and off?
A. Solenoid
B. Latch
C. Plunger
D. Knob/Handle
Show the Answer
Knob/Handle
Question 11
What part of an MCB moves to make or break the connection?
A. Incoming Terminal
B. Fixed Contact
C. Dynamic Contact
D. Arc Chutes
Show the Answer
Dynamic Contact
Question 12
Which MCB component serves as the main point for power entry?
A. Outgoing Terminal
B. Incoming Terminal
C. Bi-metallic Strip Carrier
D. Din Rail Holder
Show the Answer
Incoming Terminal
Question 13
Which component in an MCB ensures secure mounting in a electrical panel?
A. Mounting Base
B. Safety Barriers
C. Arc Chutes Holder
D. Din Rail Holder
Show the Answer
Din Rail Holder
Question 14
What is the function of the plunger in an MCB?
A. Extinguishing arcs
B. Insulating the contacts
C. Detecting overloads
D. Operating the tripping mechanism
Show the Answer
Operating the tripping mechanism
Question 15
Which component of an MCB holds the arc chutes in place?
A. Bi-metallic Chutes Holder
B. Solenoid
C. Arc Chutes Holder
D. Plunger
Show the Answer
Arc Chutes Holder
Question 16
What is the role of the outgoing terminal in an MCB?
A. Extinguishing the arc
B. Detecting short circuits
C. Connecting to the power source
D. Connecting to the load
Show the Answer
Connecting to the load
Question 17
What ensures the proper alignment and function of the bi-metallic strip in an MCB?
A. Arc Chutes Holder
B. Plunger
C. Din Rail Holder
D. Calibration Screw
Show the Answer
Calibration Screw
Question 18
Which MCB component provides visual feedback on the status of the breaker?
A. Plunger
B. Indicator Window
C. Solenoid
D. Incoming Terminal
Show the Answer
Indicator Window
Question 19
Which part of an MCB is responsible for holding the internal components together and providing insulation?
A. Housing/Casing
B. Plunger
C. Arc Chutes Holder
D. Safety Barriers
Show the Answer
Housing/Casing
Question 20
What component in an MCB can be used to release the breaker manually (in some models)?
A. Plunger
B. Release Lever
C. Incoming Terminal
D. Arc Chutes Holder
Show the Answer
Release Lever
Question 21
What is the primary function of the internal wiring in an MCB?
A. Extinguishing arcs
B. Providing electrical connections
C. Detecting short circuits
D. Holding components
Show the Answer
Providing electrical connections
Question 22
Which part of an MCB ensures that contacts remain properly aligned and connected?
A. Fixed Contact
B. Arc Chutes Holder
C. Indicator Window
D. Spring Mechanism
Show the Answer
Fixed Contact
Question 23
What component in an MCB resets the breaker to its original position after tripping?
A. Solenoid
B. Arc Chutes Holder
C. Plunger
D. Spring Mechanism
Show the Answer
Spring Mechanism
Question 24
Which part of an MCB provides a secure foundation for all the internal components?
A. Mounting Base
B. Indicator Window
C. Solenoid
D. Incoming Terminal
Show the Answer
Mounting Base
Question 25
What component in an MCB can be used to adjust the tripping characteristics?
A. Incoming Terminal
B. Arc Chutes
C. Solenoid
D. Calibration Screw
Show the Answer
Calibration Screw
Question 26
What is the function of auxiliary contacts in an MCB?
A. Offering additional signaling or control functions
B. Detecting overloads
C. Providing electrical insulation
D. Extinguishing arcs
Show the Answer
Offering additional signaling or control functions
Question 27
How does the spring mechanism contribute to the functioning of an MCB?
A. Extinguishing arcs
B. Detecting overloads
C. Operating the tripping mechanism
D. Resetting the breaker
Show the Answer
Operating the tripping mechanism
Question 28
What is the primary purpose of the insulating material in an MCB?
A. Providing electrical insulation
B. Extinguishing arcs
C. Detecting short circuits
D. Operating the tripping mechanism
Show the Answer
Providing electrical insulation
Question 29
What function does the solenoid serve in an MCB?
A. Detecting overloads
B. Creating a magnetic field for tripping
C. Manually resetting the breaker
D. Holding the contacts in place
Show the Answer
Creating a magnetic field for tripping
Question 30
What role does the latch play in the operation of an MCB?
A. Resetting the breaker
B. Holding the breaker in the “on” position
C. Detecting overloads
D. Cooling the contacts
Show the Answer
Holding the breaker in the “on” position
Question 31
Which component in an MCB moves to physically separate the contacts when tripping?
A. Fixed Contact
B. Plunger
C. Dynamic Contact
D. Operating Mechanism
Show the Answer
Plunger
Read Next:
- Star Delta Starter Circuit Diagram
- What is Vacuum Circuit Breaker?
- DOL Starter Principle & Applications
- Read an Electrical Single Line Diagram
- Residual Current Circuit Breaker (RCCB)