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03 Jul 2020, 00:19
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A certain electric utility is considering exactly two designs (Designs 1 and 2) for a new power generation plant. Each design would result in a plant that would generate the same amount of power annually; but Design 1 would use a single Type A power generator, whereas Design 2 would use three Type B power generators.
Type A generators cost less than Type B generators to fuel per unit of power generated and vent through taller chimneys, which better prevent pollutants from concentrating near the plant. However, Type A generators produce solid waste that is difficult and expensive to dispose of safely.
Type B generators produce no solid waste and, as compared to Type A generators, vent approximately half as much Pollutant X, and even less Pollutant Y, per unit of power generated annually. However, Type B generators vent through much shorter chimneys.
Type A generators cost less than Type B generators to fuel per unit of power generated and vent through taller chimneys, which better prevent pollutants from concentrating near the plant. However, Type A generators produce solid waste that is difficult and expensive to dispose of safely.
Type B generators produce no solid waste and, as compared to Type A generators, vent approximately half as much Pollutant X, and even less Pollutant Y, per unit of power generated annually. However, Type B generators vent through much shorter chimneys.
A desire to use the type of generator that costs less to fuel per unit of power generated: Yes
A desire to avoid having to dispose of solid waste: No
A desire to emit less Pollutant X per unit of power generated annually: No
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
73% (02:33) correct
27%
(02:32)
wrong
based on 1278
sessions
History
Date
Time
Result
Not Attempted Yet
1. Suppose that the utility chooses Design 1 over Design 2. For each of the following motivations, select Yes if the information in the tabs suggests that it would help explain this choice. Otherwise, select No
| Yes | No | |
| A desire to use the type of generator that costs less to fuel per unit of power generated | ||
| A desire to avoid having to dispose of solid waste | ||
| A desire to emit less Pollutant X per unit of power generated annually |
ShowHide Answer
Official Answer
A desire to use the type of generator that costs less to fuel per unit of power generated: Yes
A desire to avoid having to dispose of solid waste: No
A desire to emit less Pollutant X per unit of power generated annually: No
During the startup phase, the Design 1 power plant would emit more Pollutant Y per hour than would the Design 2 power plant.: Yes
During the normal generating phase, the emissions per hour of Pollutant Y from the Design 2 power plant would be less than 5% of those from the Design 1 power plant.: No
During the normal generating phase, the contribution to the ground-level concentration of Pollutant Y from the Design 2 power plant would be less than 25% of that from the Design 1 power plant.: No
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
44% (02:18) correct
56%
(02:10)
wrong
based on 1464
sessions
History
Date
Time
Result
Not Attempted Yet
2. For each of the following statements, select Yes if the statement accurately reflects the information given in the tabs. Otherwise, select No
| Yes | No | |
| During the startup phase, the Design 1 power plant would emit more Pollutant Y per hour than would the Design 2 power plant. | ||
| During the normal generating phase, the emissions per hour of Pollutant Y from the Design 2 power plant would be less than 5% of those from the Design 1 power plant. | ||
| During the normal generating phase, the contribution to the ground-level concentration of Pollutant Y from the Design 2 power plant would be less than 25% of that from the Design 1 power plant. |
ShowHide Answer
Official Answer
During the startup phase, the Design 1 power plant would emit more Pollutant Y per hour than would the Design 2 power plant.: Yes
During the normal generating phase, the emissions per hour of Pollutant Y from the Design 2 power plant would be less than 5% of those from the Design 1 power plant.: No
During the normal generating phase, the contribution to the ground-level concentration of Pollutant Y from the Design 2 power plant would be less than 25% of that from the Design 1 power plant.: No
1.22
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
56% (01:25) correct
44%
(01:29)
wrong
based on 1102
sessions
History
Date
Time
Result
Not Attempted Yet
3. Suppose that the startup phase for Type A generators takes exactly one hour. Given this and based on the information in the tabs, which one of the following would be closest to the startup time, in hours, for Type B generators that would result in equal emissions of Pollutant Y for both power plant designs during a single startup phase?
| 3.67 | |
| 0.27 | |
| 0.81 | |
| 1.22 | |
| 36.33 |
A certain electric utility is considering exactly two designs (Designs 1 and 2) for a new power generation plant. Each design would result in a plant that would generate the same amount of power annually; but Design 1 would use a single Type A power generator, whereas Design 2 would use three Type B power generators.
Type A generators cost less than Type B generators to fuel per unit of power generated and vent through taller chimneys, which better prevent pollutants from concentrating near the plant. However, Type A generators produce solid waste that is difficult and expensive to dispose of safely.
Type B generators produce no solid waste and, as compared to Type A generators, vent approximately half as much Pollutant X, and even less Pollutant Y, per unit of power generated annually. However, Type B generators vent through much shorter chimneys.
Attachment:
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16 Aug 2021, 04:40
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Why is the answer for 1.1 part 3 'NO'?
"A desire to emit less Pollutant X per unit of power generated annually"
As compared to Type A gen, Type B emits half the amount of Pollutant X. However Design 2 uses 3 Type B gens, which means that if Design 1 (with 1 Type A gen) emits 10g of Pollutant X, then Design B (with 3 Type B gens) will emit (10g/2) * 3 = 15g Pollutant X.
Shouldn't the answer for this be 'YES'?
"A desire to emit less Pollutant X per unit of power generated annually"
As compared to Type A gen, Type B emits half the amount of Pollutant X. However Design 2 uses 3 Type B gens, which means that if Design 1 (with 1 Type A gen) emits 10g of Pollutant X, then Design B (with 3 Type B gens) will emit (10g/2) * 3 = 15g Pollutant X.
Shouldn't the answer for this be 'YES'?
04 Jan 2021, 02:10
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Deepakjhamb
Sajjad1994 - i had a doubt in this question we are saying 1 Generator A used in design 1 and 3 generators used in Design 2 . But if we see q1 where its asked cost per unit of power to fuel we are not considering 3 generators in design 2 . Also when we are asked about emissions we choose not to consider 3 generators while checking for answer .
While from q2 and q3 onwards we consider 3 generators working in design b .
wanted some clarification on this as if you consider the both generators generate same power anually - we cannot be sure about 3 generators working together to generate same level of output , may be somebody can assume that in type b generators there is some heating issue due to which generators have to work in a cyclic manner and not 1 at a time . Request u to pls clarify on this particular part of assumption on type b generators working together to generate same power . In that case answers to q1 -part1 and part3 should also be taken as per 3 generators of type B
Hello DeepakWhile from q2 and q3 onwards we consider 3 generators working in design b .
wanted some clarification on this as if you consider the both generators generate same power anually - we cannot be sure about 3 generators working together to generate same level of output , may be somebody can assume that in type b generators there is some heating issue due to which generators have to work in a cyclic manner and not 1 at a time . Request u to pls clarify on this particular part of assumption on type b generators working together to generate same power . In that case answers to q1 -part1 and part3 should also be taken as per 3 generators of type B
This question belongs to GMAT Prep so there is no doubt on the quality of the questions, Please read the OE below.
Official Explanation
1 Suppose that the utility chooses Design 1 over Design 2. For each of the following motivations, select Yes if the information in the tabs suggests that it would help explain this choice. Otherwise, select No.
RO1
Design 1 uses a single Type A generator. The discussion says that Type A generators cost less than Type B generators to fuel per unit of power generated, so a desire to use a Type A generator would help explain the choice of Design 1.
The correct answer is Yes.
RO2
The discussion says that Type A generators used in Design 1 produce solid waste, unlike the Type B generators used in Design 2. Thus, a desire to avoid having to dispose of solid waste would not help explain the choice of Design 1.
The correct answer is No.
RO3
Designs 1 and 2 generate the same amount of power per year. However, the generators used in Design 2 vent about half as much Pollutant X per unit of power generated annually as the generators used in Design 1. Therefore, the total amount of Pollutant X vented per year from the use of Design 2 is about half of the total amount of Pollutant X vented per year from the use of Design 1. Because both designs generate the same amount of power per year, this same relationship holds for the amount of Pollutant X vented per unit of power generated annually. Thus, a desire to emit less Pollutant X per unit of power generated annually would be an argument for choosing Design 2 over Design 1 and not an argument for choosing Design 1 over Design 2.
The correct answer is No.
2 For each of the following statements, select Yes if the statement accurately reflects the information given in the tabs. Otherwise, select No.
RO1
According to the discussion, Design 1 would use a single Type A power generator. The chart shows that a Type A generator emits 744 kg/hr of Pollutant Y during the startup phase. The discussion indicates that Design 2 would use three Type B power generators. The chart shows that each Type B generator emits 203 kg/hr of Pollutant Y during the startup phase. The total emission rate for three Type B generators would be 3(203) = 609 kg/hr. Since 744 > 609, Design 1 would emit more Pollutant Y per hour during the startup phase than would Design 2.
The correct answer is Yes.
RO2
The chart shows that during the normal generating phase, a Type B generator emits 6 kg/hr of Pollutant Y. Design 2 uses three of these generators, so its total emission rate during this phase would be 3(6) = 18 kg/hr. Design 1 uses a single Type A generator, which the chart shows emits 218 kg/hr of Pollutant Y during the normal generating phase. Five percent of 218 kg/hr is 10.9 kg/hr, and the emission rate of Design 2 (18 kg/hr) is not less than this amount.
The correct answer is No.
RO3
According to the chart, each Type B generator increases the ground-level concentration of Pollutant Y by 3 mcg/m3 during the normal generating phase. Design 2 uses three of these generators, so its total contribution would be 3(3) = 9 mcg/m3. Design 1 uses a single Type A generator, which the chart shows to increase the ground-level concentration of Pollutant Y by 13 mcg/m3 during the normal generating phase. Twenty-five percent of 13 is 3.25, and the Pollutant Y contribution of Design 2 (9 mcg/m3) is not less than that number.
The correct answer is No.
3 Suppose that the startup phase for Type A generators takes exactly one hour. Given this and based on the information in the tabs, which one of the following would be closest to the startup time, in hours, for Type B generators that would result in equal emissions of Pollutant Y for both power plant designs during a single startup phase?
Let t denote the number of hours of startup it will take for the amount of Pollutant Y emitted by Design 2 to equal the amount emitted by Design 1 in a single hour of startup. Design 1 uses one Type A generator, which the chart shows emits 744 kg of Pollutant Y in an hour of startup. Design 2 uses three Type B generators, each of which emits 203 kg of Pollutant Y per hour of startup. Thus, since t hours of Design 2 startup emits the same amount of Pollutant Y as one hour of Design 1 startup, 3(203 kg/hr)(t hr) = 744 kg. Solving for t gives \(t=\frac{744}{609}\), which is approximately 1.22.
The correct answer is 1.22.
1 Suppose that the utility chooses Design 1 over Design 2. For each of the following motivations, select Yes if the information in the tabs suggests that it would help explain this choice. Otherwise, select No.
RO1
Design 1 uses a single Type A generator. The discussion says that Type A generators cost less than Type B generators to fuel per unit of power generated, so a desire to use a Type A generator would help explain the choice of Design 1.
The correct answer is Yes.
RO2
The discussion says that Type A generators used in Design 1 produce solid waste, unlike the Type B generators used in Design 2. Thus, a desire to avoid having to dispose of solid waste would not help explain the choice of Design 1.
The correct answer is No.
RO3
Designs 1 and 2 generate the same amount of power per year. However, the generators used in Design 2 vent about half as much Pollutant X per unit of power generated annually as the generators used in Design 1. Therefore, the total amount of Pollutant X vented per year from the use of Design 2 is about half of the total amount of Pollutant X vented per year from the use of Design 1. Because both designs generate the same amount of power per year, this same relationship holds for the amount of Pollutant X vented per unit of power generated annually. Thus, a desire to emit less Pollutant X per unit of power generated annually would be an argument for choosing Design 2 over Design 1 and not an argument for choosing Design 1 over Design 2.
The correct answer is No.
2 For each of the following statements, select Yes if the statement accurately reflects the information given in the tabs. Otherwise, select No.
RO1
According to the discussion, Design 1 would use a single Type A power generator. The chart shows that a Type A generator emits 744 kg/hr of Pollutant Y during the startup phase. The discussion indicates that Design 2 would use three Type B power generators. The chart shows that each Type B generator emits 203 kg/hr of Pollutant Y during the startup phase. The total emission rate for three Type B generators would be 3(203) = 609 kg/hr. Since 744 > 609, Design 1 would emit more Pollutant Y per hour during the startup phase than would Design 2.
The correct answer is Yes.
RO2
The chart shows that during the normal generating phase, a Type B generator emits 6 kg/hr of Pollutant Y. Design 2 uses three of these generators, so its total emission rate during this phase would be 3(6) = 18 kg/hr. Design 1 uses a single Type A generator, which the chart shows emits 218 kg/hr of Pollutant Y during the normal generating phase. Five percent of 218 kg/hr is 10.9 kg/hr, and the emission rate of Design 2 (18 kg/hr) is not less than this amount.
The correct answer is No.
RO3
According to the chart, each Type B generator increases the ground-level concentration of Pollutant Y by 3 mcg/m3 during the normal generating phase. Design 2 uses three of these generators, so its total contribution would be 3(3) = 9 mcg/m3. Design 1 uses a single Type A generator, which the chart shows to increase the ground-level concentration of Pollutant Y by 13 mcg/m3 during the normal generating phase. Twenty-five percent of 13 is 3.25, and the Pollutant Y contribution of Design 2 (9 mcg/m3) is not less than that number.
The correct answer is No.
3 Suppose that the startup phase for Type A generators takes exactly one hour. Given this and based on the information in the tabs, which one of the following would be closest to the startup time, in hours, for Type B generators that would result in equal emissions of Pollutant Y for both power plant designs during a single startup phase?
Let t denote the number of hours of startup it will take for the amount of Pollutant Y emitted by Design 2 to equal the amount emitted by Design 1 in a single hour of startup. Design 1 uses one Type A generator, which the chart shows emits 744 kg of Pollutant Y in an hour of startup. Design 2 uses three Type B generators, each of which emits 203 kg of Pollutant Y per hour of startup. Thus, since t hours of Design 2 startup emits the same amount of Pollutant Y as one hour of Design 1 startup, 3(203 kg/hr)(t hr) = 744 kg. Solving for t gives \(t=\frac{744}{609}\), which is approximately 1.22.
The correct answer is 1.22.
I hope it helps
