Question 1
Can a Zener barrier be polarity dependent?
- Yes.
- No.
- Only the output for the Hazardous area.
Electrical Exi Installation
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Question 2
Can a non-certified measuring device affect an IS loop?- Yes, it might add energy to the loop or affect the inductance and capacitance in the loop.
- No, the barrier detects a potential high energy from the field and starts reducing the voltage in the loop.
- Only when connected in the field device end.
Question 3
Can we use a circuit for gas group IIC in an environment with IIA gas?- Yes.
- No.
- Only if the level of protection is «ia».
Question 4
Can we use an Ex «nL» field device in an Ex «ic» circuit?- No.
- No, only in an Ex «ia» or «ib» circuit.
- Yes.
Question 5
Can we work on live IS circuits in a hazardous environment?- Yes.
- No, the enclosures of Ex «i» shall be able to contain an internal overpressure.
- No, the potential sparks may ignite a gas.
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About this CBT test
Electrical Exi Installation is a CBT test with 39 questions and verified answers. Common topics include: zener barrier, field device, level protection, circuits, circuit, gas, earth, loop.
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