Exam (elaborations)
4B MODULE 1 TEST QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
- Course
- Institution
4B MODULE 1 TEST QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
[Show more]
Seller
Follow
Performance
Reviews received
Content preview
4B MODULE 1 TEST QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
True - ANSWER Frequency is expressed as cycles per second, or Hertz (Hz).
True - ANSWER For current to flow through a circuit, the power source must apply enough electromotive
force (voltage) to cause electrons to flow.
True - ANSWER Current flow in an alternating-current circuit moves in both directions due to the
changing polarity of the voltage, whereas direct current flows only in one direction.
True - ANSWER When a magnetic field moves through a coil of wire, the lines of force of the magnetic
field cause electrons in the wire to flow in a specific direction. When the magnetic field moves in the
opposite direction, electrons in the wire flow in the opposite direction.
False - ANSWER A simple ac generator can be visualized as a loop of wire rotating within the magnetic
lines of force between similar poles of a magnet.
All of these - ANSWER The voltage produced by an ac generator is dependent upon the _____.
Current or voltage - ANSWER A waveform is a mathematical representation on a graph that can be used
to visualize the level and direction of _____ in a circuit.
True - ANSWER A pure direct-current waveform displays the polarity and magnitude of the current or
voltage as a flat waveform.
Any of these - ANSWER Most commercial alternating-current power is produced by a generator driven by
_____.
True - ANSWER The waveform for alternating-current circuits is symmetrical with positive above and
negative below the zero-reference level.
, Nonlinear loads - ANSWER A nonsinusoidal (or nonsymmetrical) waveform is produced when multiple
alternating-current waveforms of different frequencies are introduced on a circuit, typically by _____.
Phase - ANSWER When the term "_____" is used in relation to waveforms, it indicates the degree
relationship between two waveforms, such as voltage-to-current or voltage-to-voltage.
True - ANSWER Waveforms that are "in-phase" with each other means that at every instant, the current
is exactly in step with the applied voltage, and both the current and voltage waveforms reach their zero
and peak values at the same instant in time.
True - ANSWER A three-phase generator has each of its three windings evenly spaced around the rotor
and the windings are 120° out-of-phase from each other.
Voltage - ANSWER When describing the relationship between voltage and current waveforms, the
reference waveform (the one used to compare against) is the _____.
True - ANSWER A "lagging" waveform is when the voltage lags behind the current and a "leading"
waveform means the voltage leads the current.
Resistive - ANSWER A _____ load has its voltage waveform finishing its cycle at the same time (without
lead or lag) as the current waveform.
Inductive - ANSWER In circuits with _____ loads, the voltage waveform finishes its cycle before the
current waveform, so the voltage waveform "leads" the current waveform.
Capacitive - ANSWER In circuits with _____ loads, the voltage waveform finishes after the current
waveform so the voltage "lags" the current.
True - ANSWER Effective current value is also known as the "Root-Mean-Square" (RMS) value.
True - ANSWER Depending on the instant selected, the instantaneous value can range anywhere from a
zero, to a positive peak, or to a negative peak.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Performance. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$21.01. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now