Mastering Modern fossil fuel Power Generation - Role of future Power Plant Engineers

A: Option A respects sequence. Oil inventory and heater permissives protect against dry running and viscosity issues, and comparing local gauges to transmitters catches wiring or impulse line errors before actuation. Option B feels practical — techs like to see valves move — but stroking before confirming permissives risks running the pump against a closed system. Option C is a desk check; correct data doesn't stop physical damage if the skid isn't ready. Option D borrows rotating equipment logic; rotation checks matter, but they come after ensuring the system is safely oil-filled and instrumented.

A: Option A picks up a real documentation risk: tag intent versus symbol semantics. Under audit, that inconsistency gets flagged fast. Option B mixes up line styles; dashed signals denote control, not mechanical integrity. Option C imports a rule of thumb from other services; fail-safe direction depends on boiler design and trip philosophy. Option D is a safety assumption from maintenance practice, not a universal P&ID requirement.

A: Option B tracks cause to consequence: uncovered tubes lose heat sink and fail fast. Option A sounds linked because everything is connected, but GT combustion doesn't care about HRSG drum level on that timescale. Option C confuses low level with high pressure; pressure control and safety valves address that. Option D is a water chemistry issue over weeks, not minutes during a bypassed trip.

A: Option A follows the chain: 12 MW / 0.9 ≈ 13.3 MW fuel, convert using LHV and density to land near 1,000 Nm3/hr. Option B flips efficiency logic; losses increase fuel demand, not reduce it. Option C assumes LHV includes condensation effects; that's backwards and underestimates flow. Option D drags HHV into the mix without stating it, inflating the number beyond the given basis.