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Small experimental vacuum tubes can operate in heat that makes semicon

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Small experimental vacuum tubes can operate in heat that makes semicon  [#permalink]

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New post 01 Jan 2019, 08:40
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  55% (hard)

Question Stats:

64% (02:01) correct 36% (02:01) wrong based on 150 sessions

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Small experimental vacuum tubes can operate in heat that makes semiconductor components fail. Any component whose resistance to heat is greater than that of semiconductors would be preferable for use in digital circuits, but only if that component were also comparable to semiconductors in all other significant respects, such as maximum current capacity. However, vacuum tubes’ maximum current capacity is presently not comparable to that of semiconductors.

If the statements above are true, which one of the following must also be true?

(A) Vacuum tubes are not now preferable to semiconductors for use in digital circuits.
(B) Once vacuum tubes and semiconductors have comparable maximum current capacity, vacuum tubes will be used in some digital circuits.
(C) The only reason that vacuum tubes are not now used in digital circuits is that vacuum tubes’ maximum current capacity is too low.
(D) Semiconductors will always be preferable to vacuum tubes for use in many applications other than digital circuits.
(E) Resistance to heat is the only advantage that vacuum tubes have over semiconductors.

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Re: Small experimental vacuum tubes can operate in heat that makes semicon  [#permalink]

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New post 01 Jan 2019, 23:44
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Akela wrote:
Small experimental vacuum tubes can operate in heat that makes semiconductor components fail. Any component whose resistance to heat is greater than that of semiconductors would be preferable for use in digital circuits, but only if that component were also comparable to semiconductors in all other significant respects, such as maximum current capacity. However, vacuum tubes’ maximum current capacity is presently not comparable to that of semiconductors.

If the statements above are true, which one of the following must also be true?

(A) Vacuum tubes are not now preferable to semiconductors for use in digital circuits.
(B) Once vacuum tubes and semiconductors have comparable maximum current capacity, vacuum tubes will be used in some digital circuits.
(C) The only reason that vacuum tubes are not now used in digital circuits is that vacuum tubes’ maximum current capacity is too low.
(D) Semiconductors will always be preferable to vacuum tubes for use in many applications other than digital circuits.
(E) Resistance to heat is the only advantage that vacuum tubes have over semiconductors.


IMO A. It is the combination of the last two sentences of the passage.
B is incorrect because the passage doesn't talk about usage, it only mentions preference of vacuum tubes over semiconductors.
C and E are extreme choices, 'only reason' 'only advantage'. These extreme statements are not supported by the passage.
Choice D talks about applications other than digital circuits and hence is out of scope.
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Re: Small experimental vacuum tubes can operate in heat that makes semicon  [#permalink]

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New post 02 Jan 2019, 03:36
Akela wrote:
Small experimental vacuum tubes can operate in heat that makes semiconductor components fail. Any component whose resistance to heat is greater than that of semiconductors would be preferable for use in digital circuits, but only if that component were also comparable to semiconductors in all other significant respects, such as maximum current capacity. However, vacuum tubes’ maximum current capacity is presently not comparable to that of semiconductors.

If the statements above are true, which one of the following must also be true?

(A) Vacuum tubes are not now preferable to semiconductors for use in digital circuits.
(B) Once vacuum tubes and semiconductors have comparable maximum current capacity, vacuum tubes will be used in some digital circuits.
(C) The only reason that vacuum tubes are not now used in digital circuits is that vacuum tubes’ maximum current capacity is too low.
(D) Semiconductors will always be preferable to vacuum tubes for use in many applications other than digital circuits.
(E) Resistance to heat is the only advantage that vacuum tubes have over semiconductors.


Vacuum tubes can resist more heat than semiconductor components.
A component whose resistance to heat is more will be preferable but only if it is comparable in other respects too such as maximum current capacity.
Vacuum tubes current capacity is not comparable yet.

Which of the following is a conclusion?

(A) Vacuum tubes are not now preferable to semiconductors for use in digital circuits.

Vacuum tubes are not comparable in other respects. It is not comparable in maximum current capacity. Hence they are not preferable to semiconductors. This is correct.

(B) Once vacuum tubes and semiconductors have comparable maximum current capacity, vacuum tubes will be used in some digital circuits.

We don't know that. Maximum current capacity is just one of the "other respects". Is it comparable in other "other respects" too? We don't know.

(C) The only reason that vacuum tubes are not now used in digital circuits is that vacuum tubes’ maximum current capacity is too low.

Again, is this the ONLY reason? Is it comparable in "other respects"? This may not be the "only reason".

(D) Semiconductors will always be preferable to vacuum tubes for use in many applications other than digital circuits.

Not known what will happen in the future.

(E) Resistance to heat is the only advantage that vacuum tubes have over semiconductors.

Not known from the argument.

Answer (A)
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Small experimental vacuum tubes can operate in heat that makes semicon  [#permalink]

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New post 06 Jan 2019, 19:17
Here, we have a necessary condition - only if that component were also comparable to semiconductors in all other significant respects, such as maximum current capacity which means if the component is not comparable to semiconductors in any of the other significant respects, then the component will not be preferable for use in digital circuits.
A - since vacuum tube is not comparable to semiconductors in one respect(maximum current capacity) => it will not be preferable for use in digital circuits
B- It says that if we fix maximum current capacity then we will be good. What about other features? What if conductivity of vacuum tube is lower than that of semiconductor? If this is true then it will not be preferable for use in digital circuits.
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Small experimental vacuum tubes can operate in heat that makes semicon   [#permalink] 06 Jan 2019, 19:17
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