Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

[Q]: Question: Is there a semantic difference between engine and motor? In some cases, would the use of one or the other word be technically incorrect?
Answer: The real difference, is the fact that "motors" run on electricity, while "engines" run on combustion. However, many people interchange the usage of these words: On the rare occasions we encounter one, we refer to a steam locomotive as an engine, the same word that we give to the motive power of an aircraft. But all electrical devices are driven by motors. In Britain at least, one's personal transport is a motor car (with compounds such as motor trade, motor vehicle and motor sport), even though it's always powered by an engine. Small boats may have outboard motors and then are often called motor boats. From a mechanic: So, what is the difference between an engine and a motor? Motors are electric. Electricity powers motors. Engines are powered by come sort of pressure or combustion, ie: steam engines, automobile engines, diesel engines. Pretty simple, really.
[A]: no

[Q]: Question: Someone told me that I shouldn't use the phrase discuss about, but should say, instead, discuss (the topic). He said discuss means talk about and using discuss about is like saying talk about about, which is redundant. Is he correct? Could somebody elaborate on this?
Answer: Your friend is correct. You can discuss something, or you can talk about it, but discuss about is redundant for the reason you identified. discuss: to speak with another or others about But if you want to use the word about, you can have a conversation about, confer about, debate about, or even have a powwow about. Most of the other synonyms for discuss don't take about, nor is it needed to converse (or debate).
[A]: yes

[Q]: Question: Possible Duplicate: Types of things vs. types of thing When using the phrase "types of" or "kinds of," it often seems appropriate to follow with a singular noun (e.g., types of rock), but at other times a plural noun sounds better (e.g., types of sentences). Is there some kind of rule about this?
Answer: Here's a rule of thumb with which to decide the correct usage in any given case. Turn the phrase around: I like all kinds of music = I like music of all kinds I like all kinds of apple = I like apple of all kinds I like all kinds of apples = I like apples of all kinds And so on.
[A]:
yes