Correct
To determine the maximum number of servers, we need to calculate the total power available and then divide it by the power consumption of each server.
1. Calculate the total power available:
- Power (in Watts) = Voltage (in Volts) × Current (in Amps)
- Power = 120V × 150A = 18000 Watts
2. Consider a safety margin:
- It’s crucial not to utilize the power circuit to its full capacity to prevent overloads and ensure stable operation. A common practice is to use around 80% of the available power.
- Usable Power = Total Power × 80%
- Usable Power = 18000 Watts × 0.80 = 14400 Watts
3. Calculate the maximum number of servers:
- Maximum Servers = Usable Power / Power per Server
- Maximum Servers = 14400 Watts / 65 Watts/server ≈ 221.54 servers
Since you cannot have a fraction of a server, the maximum whole number of servers that can be safely racked is 221.
Now let’s evaluate the options:
❌ A. 200 ○ This number is less than the calculated maximum of 221 (after considering the safety margin). While it’s a safe number, it’s not the maximum possible.
❌ B. 225 ○ This number slightly exceeds the calculated maximum of 221.54. Racking 225 servers would likely push the power consumption beyond the recommended 80% safety margin.
✅ C. 275 ○ This number significantly exceeds the total usable power (14400 Watts). These many servers would require far more than the 150-amp service provides.
❌ D. 250 ○ This number also significantly exceeds the total usable power.
❌ E. 300 ○ This number represents a power draw almost double the usable capacity, making it impossible with the given power service.
Based on the calculations, the closest and most accurate answer, considering the need to stay within a safe operating capacity, would be slightly above 221. However, since 225 exceeds this, and the other options are significantly lower or higher, there might be a slight discrepancy in the provided options or a need for a more conservative safety margin depending on the specific datacenter policies.
Given the provided options, none perfectly match the calculated maximum with an 80% safety margin. However, if we were to choose the highest number that doesn’t drastically exceed the calculated limit without the strict 80% margin, we might consider the calculation without the safety margin:
- Maximum Servers (without safety margin) = 18000 Watts / 65 Watts/server ≈ 276.92 servers
Even without the safety margin, 275 is the closest option. However, it’s crucial to reiterate that operating at 100% capacity is not recommended.
Considering the need for a safety margin, none of the provided options are ideally correct. However, if we must choose the closest without exceeding the absolute limit, 275 is the nearest whole number calculated without the safety margin.
It’s important to emphasize that in a real-world scenario, adhering to a safety margin (like 80%) is crucial for reliable and safe operation.
Incorrect
To determine the maximum number of servers, we need to calculate the total power available and then divide it by the power consumption of each server.
1. Calculate the total power available:
- Power (in Watts) = Voltage (in Volts) × Current (in Amps)
- Power = 120V × 150A = 18000 Watts
2. Consider a safety margin:
- It’s crucial not to utilize the power circuit to its full capacity to prevent overloads and ensure stable operation. A common practice is to use around 80% of the available power.
- Usable Power = Total Power × 80%
- Usable Power = 18000 Watts × 0.80 = 14400 Watts
3. Calculate the maximum number of servers:
- Maximum Servers = Usable Power / Power per Server
- Maximum Servers = 14400 Watts / 65 Watts/server ≈ 221.54 servers
Since you cannot have a fraction of a server, the maximum whole number of servers that can be safely racked is 221.
Now let’s evaluate the options:
❌ A. 200 ○ This number is less than the calculated maximum of 221 (after considering the safety margin). While it’s a safe number, it’s not the maximum possible.
❌ B. 225 ○ This number slightly exceeds the calculated maximum of 221.54. Racking 225 servers would likely push the power consumption beyond the recommended 80% safety margin.
✅ C. 275 ○ This number significantly exceeds the total usable power (14400 Watts). These many servers would require far more than the 150-amp service provides.
❌ D. 250 ○ This number also significantly exceeds the total usable power.
❌ E. 300 ○ This number represents a power draw almost double the usable capacity, making it impossible with the given power service.
Based on the calculations, the closest and most accurate answer, considering the need to stay within a safe operating capacity, would be slightly above 221. However, since 225 exceeds this, and the other options are significantly lower or higher, there might be a slight discrepancy in the provided options or a need for a more conservative safety margin depending on the specific datacenter policies.
Given the provided options, none perfectly match the calculated maximum with an 80% safety margin. However, if we were to choose the highest number that doesn’t drastically exceed the calculated limit without the strict 80% margin, we might consider the calculation without the safety margin:
- Maximum Servers (without safety margin) = 18000 Watts / 65 Watts/server ≈ 276.92 servers
Even without the safety margin, 275 is the closest option. However, it’s crucial to reiterate that operating at 100% capacity is not recommended.
Considering the need for a safety margin, none of the provided options are ideally correct. However, if we must choose the closest without exceeding the absolute limit, 275 is the nearest whole number calculated without the safety margin.
It’s important to emphasize that in a real-world scenario, adhering to a safety margin (like 80%) is crucial for reliable and safe operation.
Unattempted
To determine the maximum number of servers, we need to calculate the total power available and then divide it by the power consumption of each server.
1. Calculate the total power available:
- Power (in Watts) = Voltage (in Volts) × Current (in Amps)
- Power = 120V × 150A = 18000 Watts
2. Consider a safety margin:
- It’s crucial not to utilize the power circuit to its full capacity to prevent overloads and ensure stable operation. A common practice is to use around 80% of the available power.
- Usable Power = Total Power × 80%
- Usable Power = 18000 Watts × 0.80 = 14400 Watts
3. Calculate the maximum number of servers:
- Maximum Servers = Usable Power / Power per Server
- Maximum Servers = 14400 Watts / 65 Watts/server ≈ 221.54 servers
Since you cannot have a fraction of a server, the maximum whole number of servers that can be safely racked is 221.
Now let’s evaluate the options:
❌ A. 200 ○ This number is less than the calculated maximum of 221 (after considering the safety margin). While it’s a safe number, it’s not the maximum possible.
❌ B. 225 ○ This number slightly exceeds the calculated maximum of 221.54. Racking 225 servers would likely push the power consumption beyond the recommended 80% safety margin.
✅ C. 275 ○ This number significantly exceeds the total usable power (14400 Watts). These many servers would require far more than the 150-amp service provides.
❌ D. 250 ○ This number also significantly exceeds the total usable power.
❌ E. 300 ○ This number represents a power draw almost double the usable capacity, making it impossible with the given power service.
Based on the calculations, the closest and most accurate answer, considering the need to stay within a safe operating capacity, would be slightly above 221. However, since 225 exceeds this, and the other options are significantly lower or higher, there might be a slight discrepancy in the provided options or a need for a more conservative safety margin depending on the specific datacenter policies.
Given the provided options, none perfectly match the calculated maximum with an 80% safety margin. However, if we were to choose the highest number that doesn’t drastically exceed the calculated limit without the strict 80% margin, we might consider the calculation without the safety margin:
- Maximum Servers (without safety margin) = 18000 Watts / 65 Watts/server ≈ 276.92 servers
Even without the safety margin, 275 is the closest option. However, it’s crucial to reiterate that operating at 100% capacity is not recommended.
Considering the need for a safety margin, none of the provided options are ideally correct. However, if we must choose the closest without exceeding the absolute limit, 275 is the nearest whole number calculated without the safety margin.
It’s important to emphasize that in a real-world scenario, adhering to a safety margin (like 80%) is crucial for reliable and safe operation.
