
W1 Quiz Basic Concept of Electrical Machine
Authored by NORKHARZIANA UNIMAP
Engineering
University
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25 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
According to Faraday's law of electromagnetic induction, an electromotive force (EMF) is induced in a conductor whenever it:
Is placed in a static magnetic field.
Carries a constant current
Cuts magnetic flux.
Is made of copper.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A conductor is moving through a uniform magnetic field. To maximize the induced EMF, the conductor should move:
Parallel to the magnetic field lines.
Perpendicular to the magnetic field lines.
At a 45-degree angle to the field lines.
In a circular path within the field.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of laminating the iron core in a transformer or electrical machine?
To increase the magnetic flux.
To reduce eddy current loss.
To increase the core's mechanical strength.
To simplify the construction process.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A simple DC motor and a simple DC generator are constructed identically. Analyze what determines whether the machine acts as a motor or a generator.
The direction of the magnetic field.
The number of turns in the armature winding.
Whether the input is electrical energy or mechanical energy.
The type of carbon brushes used.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a purely inductive single-phase AC circuit, what is the phase relationship between the voltage and the current?
Voltage and current are in phase.
Voltage lags the current by 90 degrees.
Voltage leads the current by 90 degrees.
Voltage leads the current by 120 degrees.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A single-phase circuit supplied with 240 V AC has a load that draws 10 A. The real power consumed is 1.92 kW. Calculate the power factor.
1.0
0.9
0.8
0.7
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A single-phase motor is connected to a 230 V supply. A technician measures that the voltage leads the current. What can be concluded about the load?.
It is a purely resistive load
It is a predominantly inductive load.
It is a predominantly capacitive load.
The measurement is incorrect.
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