CDCP Cooling and Environmental Control 2

Question 1

What is the recommended temperature range for a data center's hot aisle according to ASHRAE A1 guidelines?

Accepted Answer

64.4°F–80.6°F (18°C–27°C)

Answer

59°F–68°F (15°C–20°C)

Answer

77°F–95°F (25°C–35°C)

Answer

50°F–60°F (10°C–16°C)

Question 2

What does the term 'containment' refer to in data center cooling design?

Accepted Answer

Separating hot exhaust air from cold supply air to improve cooling efficiency

Answer

Enclosing servers in fire-resistant cabinets

Answer

Using liquid nitrogen to contain thermal runaway

Answer

Sealing the data center floor to prevent air leaks

Question 3

Which cooling metric measures the ratio of heat removed by a cooling unit to the electrical energy consumed by that unit?

Accepted Answer

Coefficient of Performance (COP)

Answer

Power Usage Effectiveness (PUE)

Answer

Data Center Infrastructure Efficiency (DCiE)

Answer

Energy Reuse Efficiency (ERE)

Question 4

In a raised-floor data center, perforated tiles are placed in the cold aisle. What is the primary purpose of these tiles?

Accepted Answer

To allow conditioned air from the under-floor plenum to flow up into server intakes

Answer

To drain water from leaks in the cooling system

Answer

To provide structural support for heavy equipment

Answer

To allow hot air to return to the CRAC units below the floor

Question 5

What is 'free cooling' in the context of data center thermal management?

Accepted Answer

Using outside ambient air or water to supplement or replace mechanical refrigeration when conditions allow

Answer

Cooling servers without any energy cost using passive convection

Answer

A government subsidy for energy-efficient data centers

Answer

Using waste heat from servers to heat office spaces at no extra cost

Question 6

Which device is commonly installed at the rear of a server rack to supplement in-row cooling?

Accepted Answer

Rear-door heat exchanger (RDHx)

Answer

Plenum bypass damper

Answer

Raised-floor grille panel

Answer

Cold plate liquid manifold