Q. In a circuit, what is the purpose of a signal?
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A.
To provide power
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B.
To indicate a state or condition
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C.
To store data
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D.
To increase resistance
Solution
A signal is used to indicate a state or condition within a circuit, such as on/off or high/low.
Correct Answer:
B
— To indicate a state or condition
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Q. What does a normally open (NO) switch do?
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A.
Allows current to flow when closed
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B.
Allows current to flow when open
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C.
Always allows current to flow
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D.
Never allows current to flow
Solution
A normally open (NO) switch allows current to flow only when it is closed.
Correct Answer:
A
— Allows current to flow when closed
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Q. What is the difference between a momentary switch and a latching switch?
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A.
Momentary switches stay on until released, latching switches do not
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B.
Latching switches stay on until released, momentary switches do not
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C.
Both are the same
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D.
Momentary switches are used for high power, latching switches are not
Solution
A latching switch remains in its last position until manually changed, while a momentary switch only stays on while pressed.
Correct Answer:
B
— Latching switches stay on until released, momentary switches do not
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Q. What is the function of a pull-up resistor in a switch circuit?
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A.
To increase current
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B.
To ensure a defined logic level when the switch is open
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C.
To decrease voltage
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D.
To store charge
Solution
A pull-up resistor ensures that a defined logic level (high) is present when the switch is open.
Correct Answer:
B
— To ensure a defined logic level when the switch is open
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Q. What is the primary function of a switch in an electrical circuit?
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A.
To increase voltage
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B.
To control the flow of current
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C.
To store energy
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D.
To convert AC to DC
Solution
A switch is used to control the flow of current in a circuit by opening or closing the circuit.
Correct Answer:
B
— To control the flow of current
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Q. What type of signal is typically used in digital circuits?
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A.
Analog signal
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B.
Digital signal
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C.
Continuous signal
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D.
Variable signal
Solution
Digital circuits use digital signals, which represent data in binary form (0s and 1s).
Correct Answer:
B
— Digital signal
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Q. Which of the following describes a SPDT switch?
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A.
Single Pole Double Throw
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B.
Single Pole Double Terminal
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C.
Single Phase Double Throw
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D.
Single Phase Double Terminal
Solution
SPDT stands for Single Pole Double Throw, meaning it can connect one input to one of two outputs.
Correct Answer:
A
— Single Pole Double Throw
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Q. Which of the following is a common application of a relay?
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A.
To amplify signals
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B.
To switch high voltage circuits with low voltage control
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C.
To measure current
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D.
To store energy
Solution
Relays are used to switch high voltage circuits using a low voltage control signal.
Correct Answer:
B
— To switch high voltage circuits with low voltage control
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Q. Which type of switch is commonly used in household lighting?
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A.
Toggle switch
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B.
Push button switch
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C.
Rotary switch
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D.
Slide switch
Solution
A toggle switch is commonly used in household lighting for its simplicity and ease of use.
Correct Answer:
A
— Toggle switch
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Q. Which type of switch is commonly used to control lighting in a room?
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A.
Toggle switch
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B.
Push button switch
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C.
Rotary switch
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D.
Slide switch
Solution
A toggle switch is commonly used for lighting as it can easily turn the light on and off.
Correct Answer:
A
— Toggle switch
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