# Engineering MCQs

a. F
b. C
c. L
d. D

a. T
b. C
c. D
d. R

## What is the difference between a resistor and a potentiometer in an electrical circuit.

a. A resistor is a fixed component that provides a constant level of resistance, while a potentiometer is an adjustable component that can vary its resistance.
b. A potentiometer is a fixed component that provides a constant level of resistance, while a resistor is an adjustable component that can vary its resistance.
c. A resistor and a potentiometer are the same thing.
d. A resistor and a potentiometer both store electrical charge.
Answer: a. A resistor is a fixed component that provides a constant level of resistance, while a potentiometer is an adjustable component that can vary its resistance.

## What is the difference between an open circuit and a short circuit in an electrical circuit.

a. An open circuit occurs when there is no current flow, while a short circuit occurs when there is too much current flow.
b. An open circuit occurs when there is too much current flow, while a short circuit occurs when there is no current flow.
c. An open circuit and a short circuit are the same thing.
d. An open circuit occurs when a wire is disconnected, while a short circuit occurs when two wires are accidentally connected.
Answer: d. An open circuit occurs when a wire is disconnected, while a short circuit occurs when two wires are accidentally connected.

## What is the difference between an analog signal and a digital signal in an electrical circuit.

a. An analog signal is continuous, while a digital signal is discrete.
b. An analog signal is discrete, while a digital signal is continuous.
c. An analog signal and a digital signal are the same thing.
d. An analog signal and a digital signal both store electrical charge.
Answer: a. An analog signal is continuous, while a digital signal is discrete.

a. Watt
b. Ohm
c. Ampere
d. Hertz

## What is the difference between an electromotive force (EMF) and a voltage drop.

a. An EMF is the voltage source in a circuit, while a voltage drop is the amount of voltage lost across a component.
b. A voltage drop is the voltage source in a circuit, while an EMF is the amount of voltage lost across a component.
c. An EMF and a voltage drop are the same thing.
d. An EMF and a voltage drop have no function in an electrical circuit.
Answer: a. An EMF is the voltage source in a circuit, while a voltage drop is the amount of voltage lost across a component.

## What is the purpose of an op-amp in an electrical circuit.

a. To store electrical charge
b. To amplify electrical signals
c. To regulate voltage
d. To perform mathematical operations on electrical signals
Answer: d. To perform mathematical operations on electrical signals

## What is the difference between an analog signal and a digital signal.

a. An analog signal is continuous, while a digital signal is discrete.
b. A digital signal is continuous, while an analog signal is discrete.
c. An analog signal and a digital signal are the same thing.
d. An analog signal and a digital signal have no function in an electrical circuit.
Answer: a. An analog signal is continuous, while a digital signal is discrete.

## What is the purpose of a rectifier in an electrical circuit.

a. To store electrical charge
b. To amplify electrical signals
c. To convert AC to DC
d. To regulate voltage
Answer: c. To convert AC to DC

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