CDCS Practice Questions

A.  

Maintain the current wet pipe system.

B.  

Replace the wet pipe system with a deluge system.

C.  

Replace the wet pipe system with a dry pipe system.

D.  

Replace the wet pipe system with a pre-action system.

A.  

It does not matter, as the Sensible Heat Ratio has nothing to do with efficiency.

B.  

Not relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.

C.  

Unit A

D.  

Unit B

A.  

Drainage system under raised floor

B.  

Gas tanks need to be within or close to the data center

C.  

Pressure release valves in the data center

D.  

Proper water leak detection system

A.  

At the back of racks

B.  

Every 5th rack

C.  

One tile per rack in front

D.  

As close to AC as possible

A.  

Test the sensors by injecting smoke or simulated smoke directly into the sensor

B.  

Press the self-test button on each sensor in the data center

C.  

Inject smoke at the floor level

D.  

Test the sensors according to the vendor specification

A.  

It can only be used in computer rooms which have sufficient air changes per hour.

B.  

The gas containers need to be close to the hazard area.

C.  

It can only be used in non-continuous occupied areas.

D.  

It can only be used in computer rooms where you have sufficient positive pressure.

A.  

With current increasing, single-phase cables emit more EMF than three-phase cables

B.  

With current decreasing, three-phase cables emit more EMF than single-phase cables

C.  

With voltage increasing, single-phase cables emit more EMF than three-phase cables

D.  

With voltage decreasing, three-phase cables emit more EMF than single-phase cables

A.  

Top of Rack (ToR) design

B.  

End of Row (EoR) design

C.  

Star network design using coaxial cables

D.  

It does not matter as the number of switches is not influenced by the physical cabling layout

A.  

Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732

B.  

Phase-to-Neutral Voltage = Phase-to-Phase voltage /1.732

C.  

Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732

D.  

Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage

A.  

Mechanical strength of the casing of a fuse or breaker.

B.  

The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle without being destroyed or causing an electric damaging arc.

C.  

The current at which the device will trip.

D.  

The current that a fuse or breaker is able to interrupt without being destroyed or causing an electric damaging arc.