#1
Which of the following is a unit of electric current?
Ampere
ExplanationAmpere is the SI unit of electric current.
#2
What is the SI unit of power?
Watt
ExplanationWatt is the SI unit of power.
#3
In electrical circuits, what does the acronym AC stand for?
Alternative Current
ExplanationAC stands for Alternating Current, where the direction of current periodically reverses.
#4
In a DC circuit, what does Ohm's Law state?
V = IR
ExplanationOhm's Law states that voltage (V) equals current (I) multiplied by resistance (R).
#5
What is the purpose of a flywheel in a mechanical system?
To store and release energy
ExplanationA flywheel in a mechanical system stores rotational energy and smoothens out fluctuations in energy.
#6
What is the function of a capacitor in an electrical circuit?
To store and release electrical energy
ExplanationA capacitor stores electrical energy and releases it when needed.
#7
Which law states that the total current entering a junction in a circuit is equal to the total current leaving the junction?
Kirchhoff's Current Law
ExplanationKirchhoff's Current Law states that the algebraic sum of currents entering and leaving a junction in a circuit is zero.
#8
What is the purpose of a diode in an electronic circuit?
To allow current flow in one direction
ExplanationA diode permits current flow in only one direction and blocks it in the opposite direction.
#9
Which type of material is commonly used as a semiconductor in electronic devices?
Silicon
ExplanationSilicon is widely used as a semiconductor material in electronic devices due to its abundance and semiconductor properties.
#10
What does the term 'induction motor' refer to in electrical engineering?
A motor using magnetic induction to generate torque
ExplanationAn induction motor uses electromagnetic induction to produce rotational motion.
#11
In mechanics, what does the term 'torque' represent?
Force applied at a distance, causing rotation
ExplanationTorque is the rotational equivalent of force, representing the force applied at a distance causing an object to rotate.
#12
What is the role of a transformer in an electrical system?
To change voltage levels
ExplanationA transformer changes the voltage level of alternating current electricity.
#13
What is the primary function of a gearbox in a mechanical system?
To change speed and torque
ExplanationA gearbox in a mechanical system alters the speed and torque of rotational motion.
#14
What is the purpose of a solenoid in an electrical system?
To generate a magnetic field
ExplanationA solenoid produces a magnetic field when an electric current passes through it.
#15
In mechanics, what is the law of conservation of angular momentum?
Angular momentum is constant if no external torque acts on the system
ExplanationAngular momentum remains constant in a system unless an external torque is applied.