FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers
How does the supply voltage affect a DC motor's response to an induce emf?
According to Lenz's law, the induced emf's direction is such that it opposes the cause. In this instance, the supply voltage will be the culprit. The supply voltage will so be opposed by the induced emf.
What is the cause of the current's flow?
Electrons are necessary for a circuit's current to flow. Since electrons are negatively charged, they flow when there is a potential difference, creating a current. The electron flow is going in the opposite direction as the current.
When the secondary is open, which of the following currents is drawn by the primary circuit of an ideal transformer?
No secondary current is pulled while the secondary is open since there is no current flowing through the load. An perfect transformer's primary coil only draws magnetizing current because it is entirely inductive.
Which of the following statements regarding the induced emf in the transformer primary is true according to electrical engineering fundamentals?
The proportion of primary induced emf to induced emf each turn determines the number of primary turns. As a result, the primary turns and induced emf per turn are multiplied to create the induced emf in the transformer's primary.
How many possible directions may the electric field have at one location?
An electric field has a direction and is a vector quantity. According to this definition, the electric field's direction is down the line that forms a tangent to it. There is only one direction in the electric field at a given place.
Which of the following statements regarding direct current is true?
A direct current's value is constant across time and has a fixed value. Since it doesn't fluctuate over time, direct current has a frequency of zero.
In an AC circuit, which of the following accurately depicts the average value?
The equation for DC of equal power to a given AC is essentially provided by the form factor. The proportion of the RMS value to the average value is known as the form factor in an AC circuit. RMS value/Form factor is the formula for average value.
Who was the first person to experience the power of magnetism?
Danish physicist and chemist Hans Christian Orsted was the first to see the effects of magnetism in action. He carried out an experiment and found that an electric current can produce a magnetic field.
Which of the following must be zero according to KCL?
Kirchhoff's current law, sometimes known as KCL, is useful in identifying the currents present in a circuit. According to KCL, a junction's current entering and exiting are both equal.
Which of the following statements regarding electrical engineering's voltage transformation ratio is true?
The ratio of secondary turns to primary turns is known as the voltage transformation ratio. The ratio of primary current to secondary current or the ratio of induced emf in primary to induced emf in secondary can similarly be used to describe this.
Which of the following electrical engineering circuit types cannot be examined using Ohm's law?
Since unilateral networks only permit current flow in one direction, Ohm's law cannot be utilized to analyze them. A unilateral network may include transistors, diodes, etc.
What does an electrical element's positive power mean?
Voltage and current combine to form power in an electrical element. When both voltage and current are positive or when both are negative, positive power will be generated. If the power indicator is positive, the element is absorbing power.
Which of the following statements regarding electrical conductivity is true? Which of the following statements regarding electrical conductivity is true?
A conductor's ability to conduct electric current is determined by its electrical conductivity. The electrical conductivity () is defined by Ohm's law in its point form as the product of current density (J) and electric field (E).
Who developed an approach to measure current and defined electric current?
In the 1820s, French physicist and mathematician Andre-Marie Ampere defined electric current and developed a way to measure current.
How many electrons are required to produce a 2 Coulomb electric charge?
6.24 * 1018 electrons, or 1/(1.602*10-19) electrons, make up one coulomb of charge. A coulomb is a measurement of charge. Thus, there will be 6.24 * 1018 * 2 = 12.48 * 1018 electrons for every 2 Coulombs of charge.
When there are more secondary turns than main turns in a transformer, which of the following will happen?
The proportion of secondary turns to primary turns is known as the voltage transformation ratio. The step-up operation takes place when the transformation ratio is greater than 1.