EGSA Load Bank Testing 5

Question 1

What is the purpose of a 'block load' test during generator commissioning?

Accepted Answer

To apply a large percentage of rated load in a single step to test transient performance

Answer

A block load test applies a significant load step (often 100% rated load) at once to evaluate the generator's worst-case transient response.

Question 2

When connecting portable load bank cables to a generator output panel, which safety step must be performed first?

Accepted Answer

Verify the generator is de-energized and locked out/tagged out

Answer

LOTO (lockout/tagout) procedures must be completed before making any electrical connections to prevent electrocution.

Question 3

A generator's fuel consumption during a load bank test is significantly higher than the manufacturer's published rating at full load. This most likely indicates:

Accepted Answer

An engine performance problem such as injector wear or turbocharger inefficiency

Answer

Excessive fuel consumption at rated load suggests combustion inefficiency caused by worn injectors, a failing turbocharger, or compression loss.

Question 4

What is the function of the load bank's cooling fan during resistive load testing?

Accepted Answer

To dissipate heat generated by the resistive elements

Answer

Resistive load bank elements convert electrical energy to heat, and the internal cooling fan removes that heat to prevent element damage.

Question 5

During a load bank test at a facility, the utility power is accidentally restored while the generator is supplying the load bank. What is the most critical hazard?

Accepted Answer

Out-of-phase paralleling can cause severe mechanical and electrical damage to the generator

Answer

If utility and generator are connected out of phase, the resulting torque and current surge can destroy the generator's windings and crankshaft.

(EGSA) Electrical Generating Systems Association Certified Practice Test

(EGSA) Electrical Generating Systems Association Certified Practice Test

EGSA Load Bank Testing 5