303356
Armature is pulled towards the spring when it strikes the gong because:
1 The electromagnet gets demagnetized.
2 The current flow breaks.
3 Spring effect.
4 All of the above.
Explanation:
All of the above. The working of an electric bell is based on the magnetic effect of current. When the key is pressed, the circuit gets completed and current passes through it causing the electromagnet to get magnetised which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong. However when the armature moves towards the gong the connection between the spring strip and adjusting screw is lost which breaks the circuit and the current flow is stopped thus demagnetising the electromagnet. This causes the armature to return to its original position and it is thus pulled back due to the spring effect of the spring strip. This process is called a make and break circuit. 0
ELECTRIC CURRENT AND ITS EFFECTS
303357
Which of the following is being used in place of fuses?
1 MCB
2 Nichrome
3 Filament
4 Switch
Explanation:
MCB These days MCBs (miniature circuit breakers) are used in place of electric fuses. They are switches which turn off automatically when current exceeds safe limit.
ELECTRIC CURRENT AND ITS EFFECTS
303358
What happens to a circuit when the switch is off?
1 The circuit is complete
2 There is a gap in the circuit
3 Electricity flows continuously
4 Electricity flows discontinuously
Explanation:
There is a gap in the circuit The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit. 1
ELECTRIC CURRENT AND ITS EFFECTS
303359
The components required to make a simple series circuit to light a bulb are:
1 Wires and cell
2 Cell and switch
3 Bulb and wires
4 Both B and C
Explanation:
Both B and C The component required to make a simple series circuit to light a bulb are - Cells - Switch - Bulbs - Wires 2
303356
Armature is pulled towards the spring when it strikes the gong because:
1 The electromagnet gets demagnetized.
2 The current flow breaks.
3 Spring effect.
4 All of the above.
Explanation:
All of the above. The working of an electric bell is based on the magnetic effect of current. When the key is pressed, the circuit gets completed and current passes through it causing the electromagnet to get magnetised which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong. However when the armature moves towards the gong the connection between the spring strip and adjusting screw is lost which breaks the circuit and the current flow is stopped thus demagnetising the electromagnet. This causes the armature to return to its original position and it is thus pulled back due to the spring effect of the spring strip. This process is called a make and break circuit. 0
ELECTRIC CURRENT AND ITS EFFECTS
303357
Which of the following is being used in place of fuses?
1 MCB
2 Nichrome
3 Filament
4 Switch
Explanation:
MCB These days MCBs (miniature circuit breakers) are used in place of electric fuses. They are switches which turn off automatically when current exceeds safe limit.
ELECTRIC CURRENT AND ITS EFFECTS
303358
What happens to a circuit when the switch is off?
1 The circuit is complete
2 There is a gap in the circuit
3 Electricity flows continuously
4 Electricity flows discontinuously
Explanation:
There is a gap in the circuit The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit. 1
ELECTRIC CURRENT AND ITS EFFECTS
303359
The components required to make a simple series circuit to light a bulb are:
1 Wires and cell
2 Cell and switch
3 Bulb and wires
4 Both B and C
Explanation:
Both B and C The component required to make a simple series circuit to light a bulb are - Cells - Switch - Bulbs - Wires 2
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ELECTRIC CURRENT AND ITS EFFECTS
303356
Armature is pulled towards the spring when it strikes the gong because:
1 The electromagnet gets demagnetized.
2 The current flow breaks.
3 Spring effect.
4 All of the above.
Explanation:
All of the above. The working of an electric bell is based on the magnetic effect of current. When the key is pressed, the circuit gets completed and current passes through it causing the electromagnet to get magnetised which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong. However when the armature moves towards the gong the connection between the spring strip and adjusting screw is lost which breaks the circuit and the current flow is stopped thus demagnetising the electromagnet. This causes the armature to return to its original position and it is thus pulled back due to the spring effect of the spring strip. This process is called a make and break circuit. 0
ELECTRIC CURRENT AND ITS EFFECTS
303357
Which of the following is being used in place of fuses?
1 MCB
2 Nichrome
3 Filament
4 Switch
Explanation:
MCB These days MCBs (miniature circuit breakers) are used in place of electric fuses. They are switches which turn off automatically when current exceeds safe limit.
ELECTRIC CURRENT AND ITS EFFECTS
303358
What happens to a circuit when the switch is off?
1 The circuit is complete
2 There is a gap in the circuit
3 Electricity flows continuously
4 Electricity flows discontinuously
Explanation:
There is a gap in the circuit The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit. 1
ELECTRIC CURRENT AND ITS EFFECTS
303359
The components required to make a simple series circuit to light a bulb are:
1 Wires and cell
2 Cell and switch
3 Bulb and wires
4 Both B and C
Explanation:
Both B and C The component required to make a simple series circuit to light a bulb are - Cells - Switch - Bulbs - Wires 2
303356
Armature is pulled towards the spring when it strikes the gong because:
1 The electromagnet gets demagnetized.
2 The current flow breaks.
3 Spring effect.
4 All of the above.
Explanation:
All of the above. The working of an electric bell is based on the magnetic effect of current. When the key is pressed, the circuit gets completed and current passes through it causing the electromagnet to get magnetised which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong. However when the armature moves towards the gong the connection between the spring strip and adjusting screw is lost which breaks the circuit and the current flow is stopped thus demagnetising the electromagnet. This causes the armature to return to its original position and it is thus pulled back due to the spring effect of the spring strip. This process is called a make and break circuit. 0
ELECTRIC CURRENT AND ITS EFFECTS
303357
Which of the following is being used in place of fuses?
1 MCB
2 Nichrome
3 Filament
4 Switch
Explanation:
MCB These days MCBs (miniature circuit breakers) are used in place of electric fuses. They are switches which turn off automatically when current exceeds safe limit.
ELECTRIC CURRENT AND ITS EFFECTS
303358
What happens to a circuit when the switch is off?
1 The circuit is complete
2 There is a gap in the circuit
3 Electricity flows continuously
4 Electricity flows discontinuously
Explanation:
There is a gap in the circuit The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit. 1
ELECTRIC CURRENT AND ITS EFFECTS
303359
The components required to make a simple series circuit to light a bulb are:
1 Wires and cell
2 Cell and switch
3 Bulb and wires
4 Both B and C
Explanation:
Both B and C The component required to make a simple series circuit to light a bulb are - Cells - Switch - Bulbs - Wires 2
0