Aux 1 Unit 13 q2

1 / 10

Why might simple earth lamps be less reliable than an instrument-type earth leakage detector?

A) They provide a more detailed analysis.

D) They require complex calibration.

B) Simple earth lamps may only indicate the presence of an earth fault without providing detailed information on the severity or location, making it harder to diagnose and fix the issue.

C) They are more expensive to operate.

2 / 10

How does earth leakage affect an insulated distribution system differently from an earthed distribution system?

C) It increases the power output of the system.

D) It leads to the complete failure of the system.

A) It causes the system to shut down immediately.

B) Earth leakage in an insulated system typically does not cause immediate tripping of circuit breakers or fuses because the system is designed to operate with high impedance to ground, allowing continued operation despite a single earth fault.

3 / 10

How does the system response to earth leakage differ between an earthed and an insulated distribution system?

C) Both systems ignore the fault.

B) An earthed system responds with immediate tripping of protective devices, while an insulated system typically continues to operate despite the fault, unless a second fault occurs.

A) Both systems respond by immediately shutting down.

D) The insulated system shuts down first, followed by the earthed system.

4 / 10

How does an instrument-type earth leakage detector contribute to system safety?

D) By reducing the need for regular maintenance

C) By requiring less power to operate

B) By providing continuous monitoring and immediate alarms for any earth leakage, reducing the risk of undetected faults leading to hazards

A) By increasing the system's power output

5 / 10

What is a potential danger of earth leakage in an earthed distribution system?

A) The system becomes more efficient.

C) The system reduces its overall power consumption.

B) The earth leakage can result in equipment damage, electric shock hazards, and potential fire risks if the fault is not isolated quickly.

D) The system ignores the leakage and continues as normal.

6 / 10

What is a key advantage of using an instrument-type earth leakage detector over simple earth lamps?

B) It provides precise measurement and early detection of earth leakage currents, allowing for timely corrective action.

D) It is easier to ignore.

C) It requires less maintenance.

A) It is cheaper to install.

7 / 10

In an insulated distribution system, what is the impact of an undetected earth leakage if not promptly addressed?

D) The system reduces its voltage output.

C) The system automatically repairs itself.

B) The first earth fault may not cause immediate issues, but if a second earth fault occurs on a different phase, it could lead to a short circuit and severe damage or hazards.

A) The system operates more efficiently.

8 / 10

Why might earth leakage in an insulated distribution system be less immediately disruptive than in an earthed system?

D) Because insulated systems ignore all faults.

A) Because insulated systems have lower power ratings.

C) Because insulated systems automatically correct the fault.

B) Because insulated systems are designed to operate with one fault to ground without tripping, reducing immediate disruption.

9 / 10

What is a significant benefit of an instrument-type earth leakage detector in terms of fault diagnosis?

D) It increases the chances of undetected faults.

C) It makes the system harder to operate.

A) It provides less information than simple earth lamps.

B) It offers detailed information on the magnitude and sometimes the location of the earth leakage, which helps in quicker and more accurate fault diagnosis.

10 / 10

What is the primary effect of earth leakage in an earthed distribution system?

A) The system continues to operate normally without any issues.

B) The earth leakage causes an immediate fault current to flow to the ground, potentially leading to tripping of circuit breakers or blowing of fuses to protect the system.

D) The system increases its voltage automatically to compensate.

C) The earth leakage is ignored by the system.

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