Search for question
Question

1- When a cable carries multiple currents, all in the same direction, this would be associated

with which coupling mode?

Select one:

A. Differential mode

B. Common mode

C. Antenna mode

D. Common impedance

E. None of the above

2- Interference at the source can be reduced by:

Select one:

A. Low noise design

B. Shielding

C. Decoupling

D. Filtering

E. All of the above

3- Shielding for magnetic fields at low frequency can be done with:

Select one:

A. Purely conductive material

B. Aluminium

C. Copper

D. A high-permeability material such as mu-metal or its derivatives

E. B & C

4- In hazardous areas, one would be more inclined to consider

Select one:

A. both the upper and lower explosive limit

B. the lower explosive limit

C. the upper explosive limit

D the upper flammable limit

5- An instrument is to be mounted in a hazardous area. If it is marked T2" (maximum

surface temperature of 300°C).

Select one:

A. it is safe to be used with gasses and vapours that have an ignition temperature greater than 300°C.

B. it is safe to be used with gasses and vapours that have an ignition temperature lower that 300°C.

C it can only be used with gasses and vapours whose ignition temperature is 300°C.

D. it is unsafe as it gets too hot

6- ATEX 100a European Directive deals solely with

Select one:

A. the minimum requirements for improving the safety and health protection of workers potentially at risk from an explosive atmosphere

B. the zone classification of a hazardous area

C equipment and protective systems intended for use in potentially explosive atmospheres

D. the IEC Standard to which equipment is certified

7- Who, generally speaking, is held responsible for the appropriate explosion protection safety of any given installation?

Select one:

A. The installer

B. The equipment supplier

C. The certifying authority

D. The plant owner

8- HAZOPS work best if they are conducted

Select one:

A. when the P&IDs have been finalised, but before detailed design has commenced

B. at any time. They are not influenced by P&IDs

C. over beer and pretzels

D. before the P&IDs have started

9- Which of the following listed certificate numbers would be for an equipment which has

special conditions for installation of operation?

Select one:

A. BASOSATEX1234 U

B. PTB07ATEX1784X

C. SIRA09ATEX0645/1

D. CESI08ATEX1323