Why D but not E? Explain plz..

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bakhshaliyev: Senior | Next Rank: 100 Posts; Posts: 40; Joined: Mon Aug 30, 2010 4:55 am; Location: Baku, Azerbaijan

by bakhshaliyev » Wed Nov 10, 2010 4:43 am

Hi everybody!

Could you plz help me in the following quest:

Lacking information about energy use, people tend to overestimate the amount of energy used by
equipment. such as lights, that are visible and must be turned on and off and underestimate that used by
unobtrusive equipment, such as water heaters.

(A) equipment, such as lights, that are visible and must be turned on and off and underestimate that
(B) equipment, such as lights, that are visible and must be turned on and off and underestimate it when
(C) equipment, such as lights, that is visible and must be turned on and off and underestimate it when
(D) visible equipment, such as lights, that must be turned on and off and underestimate that
(E) visible equipment, such as lights, that must be turned on and off and underestimate it when

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Source: Beat The GMAT — Sentence Correction | Wed Nov 10, 2010 4:43 am

beat_gmat_09: Master | Next Rank: 500 Posts; Posts: 437; Joined: Sat Nov 22, 2008 5:06 amFollowed by: 1 member; Location: India; Thanked: 50 times; GMAT Score:580

by beat_gmat_09 » Wed Nov 10, 2010 6:38 am

bakhshaliyev wrote:Hi everybody!

Could you plz help me in the following quest:

Lacking information about energy use, people tend to overestimate the amount of energy used by
equipment. such as lights, that are visible and must be turned on and off and underestimate that used by
unobtrusive equipment, such as water heaters.

(A) equipment, such as lights, that are visible and must be turned on and off and underestimate that
(B) equipment, such as lights, that are visible and must be turned on and off and underestimate it when
(C) equipment, such as lights, that is visible and must be turned on and off and underestimate it when
(D) visible equipment, such as lights, that must be turned on and off and underestimate that
(E) visible equipment, such as lights, that must be turned on and off and underestimate it when

This question test's meaning and usage.
first mistake is using - lights that are visible, lights are always visible !
Here is a 3-2 split. in the non-underlined part of the sentence unobtrusive equipments is mentioned, meaning the earlier part must also have a classified type of equipment. This eliminates A,B,C.
E is incorrect because it uses when, which must be used in referring to time or in conditional stmts. This sentence does not use any.
D is better.

Hope is the dream of a man awake

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bakhshaliyev: Senior | Next Rank: 100 Posts; Posts: 40; Joined: Mon Aug 30, 2010 4:55 am; Location: Baku, Azerbaijan

by bakhshaliyev » Fri Nov 12, 2010 12:02 am

Thanks

here is another question: A or D and why?

The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.
A. include the animal known as the killer whale, which can grow to be 30 feet long and is
B. include the animal known as the killer whale, growing as big as 30 feet long and
C. include the animal known as the killer whale, growing up to 30 feet long and being
D. include the animal known as the killer whale, which can grow as big as 30 feet long and is
E. include the animal known as the killer whale, which can grow to be 30 feet long and it is

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