CDCP MCQ 4

Question 1

What is the primary advantage of using lithium-ion batteries over VRLA batteries in a data centre UPS?

Accepted Answer

Longer lifespan and higher energy density with smaller footprint

Answer

Lithium-ion batteries offer 2–3x longer service life, higher energy density, and significantly smaller footprint compared to VRLA alternatives.

Question 2

In data centre physical security, what is a mantrap (or airlock)?

Accepted Answer

A small room with two interlocking doors where only one can open at a time

Answer

A mantrap is a physical security vestibule with two doors where the first must close before the second opens, preventing tailgating.

Question 3

Which power factor value indicates that all electrical power drawn from the utility is being converted to useful work with no reactive component?

Accepted Answer

1.0

Answer

A power factor of 1.0 (unity) means all apparent power (kVA) equals real power (kW) with zero reactive power wasted.

Question 4

What does the term 'stranded capacity' refer to in data centre operations?

Accepted Answer

Power or cooling capacity that cannot be used due to imbalances or constraints

Answer

Stranded capacity occurs when power or cooling limits are reached in one dimension while capacity remains available in another, preventing full utilization.

Question 5

In hot aisle/cold aisle arrangements, which direction do server fans typically push airflow?

Accepted Answer

From cold aisle to hot aisle (front to back)

Answer

Servers draw cool air in from the cold aisle (front) and exhaust hot air out the rear into the hot aisle.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP MCQ 4