REP Renewable Energy Technologies & Applications 2

Question 1

What is the primary function of a Maximum Power Point Tracker (MPPT) in a PV system?

Accepted Answer

Adjust the operating voltage to maximize power output

Answer

Store excess solar energy in batteries

Answer

Convert DC power to AC power for grid use

Answer

Monitor panel temperature and reduce current

Question 2

In a concentrating solar power (CSP) trough system, which fluid is most commonly used as the heat transfer medium?

Accepted Answer

Synthetic oil (therminol)

Answer

Water/steam

Answer

Molten salt

Answer

Liquid sodium

Question 3

Which wind turbine configuration is most commonly deployed in utility-scale onshore wind farms today?

Accepted Answer

Horizontal-axis, upwind, three-blade turbine

Answer

Vertical-axis Darrieus turbine

Answer

Horizontal-axis, downwind, two-blade turbine

Answer

Savonius drag-type vertical-axis turbine

Question 4

What does the 'capacity factor' of a renewable energy plant represent?

Accepted Answer

Actual energy produced divided by maximum possible energy over a period

Answer

The ratio of installed capacity to peak demand

Answer

The percentage of time a plant operates at full rated output

Answer

The efficiency of converting fuel to electricity

Question 5

Which geothermal resource type requires no water injection and uses naturally occurring steam directly to drive turbines?

Accepted Answer

Dry steam reservoir

Answer

Hot dry rock (EGS)

Answer

Binary cycle low-temperature

Answer

Flash steam high-salinity

Question 6

In a run-of-river hydropower plant, what distinguishes it from a conventional reservoir-based plant?

Accepted Answer

It relies on natural river flow with minimal water storage

Answer

It uses tidal forces instead of river flow

Answer

It pumps water uphill during off-peak hours

Answer

It generates power from rainwater harvested on rooftops

Question 7

What is the primary advantage of a doubly-fed induction generator (DFIG) in wind turbines compared to a fixed-speed induction generator?

Accepted Answer

Variable-speed operation with partial-scale power converter

Answer

Zero maintenance requirements

Answer

Higher tower height capability

Answer

Direct DC output without inverter