PSPU QUIZ

In case of overload, transformer protection usually depends on:

• Differential relay

• Buchholz relay

• Thermal relay

• Distance relay

Current transformers (CTs) are used primarily for:

• Voltage measurement

• Current measurement and protection

• Power factor correction

• Improving transmission efficiency

Which device is commonly used to protect power system equipment from lightning surges?

• Current Transformer

• Circuit Breaker

• Isolator

• Lightning Arrester

A 220 kV substation uses lightning arresters. Their location should be:

• Near the generator

• Near the transformer terminals

• At load end only

• At mid-point of transmission line

If a relay fails to operate, which system feature ensures backup protection?

• Primary protection

• Fuse protection

• Secondary protection

• Backup protection

Which type of stroke occurs when lightning directly hits the conductor?

• Indirect stroke

• Shielding stroke

• Direct stroke

• Back flashover

A short-circuit fault leads to which of the following?

• Reduction in current

• Excessive current flow

• Power factor improvement

• Zero sequence current removal

HRC fuse is designed to operate under:

• Normal current

• High frequency currents

• Low power factor loads

• Short-circuit condition

Gapless Metal Oxide Surge Arrester is preferred over expulsion type because:

• It is cheaper

• It requires no series gap and offers better protection

• It has longer lifespan

• It can handle DC fault

Which fault is most common in overhead transmission lines?

• Single line-to-ground fault

• Double line-to-ground fault

• Three-phase fault

• Line-to-line fault