NRSWA Operative Practice Questions - NRSWA Street Works Operative Units (City & Guilds 6167 SWQR) Exam

What type of electromagnetic signal does a Cable Avoidance Tool (CAT) detect when operated in Power (P) mode?

Very low frequency (VLF) radio transmissions reflected by metallic gas pipes 50 Hz alternating current signals re-radiated by loaded, energised electrical power cables High-frequency 131 kHz signals generated directly by an internal battery oscillator Acoustic vibration frequencies generated by pressurised water mains

Correct Answer:

50 Hz alternating current signals re-radiated by loaded, energised electrical power cables

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