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
