Chapter 6 · MCQ Read Mode

Energy Resource Engineering

Large hydropower is correctly classified as

Electricity is best described as

The single largest component of Nepal's total energy consumption has historically been

The principal technical problem of Nepal's electricity system is

The theoretical hydropower potential of Nepal is conventionally quoted as approximately

The relationship between the Human Development Index and per capita energy consumption is

The shape of the HDI-energy curve implies that consumption in a rich one

The energy trilemma refers to the simultaneous pursuit of

The statement that the cheapest unit of energy is the one not used reflects the fact that a unit saved at the point of use

Replacing incandescent lamps with LEDs reduces lighting energy consumption by approximately

Capacitors are installed in an industrial installation principally to

Demand side management in an electricity system aims principally to

The simple payback period of an energy conservation measure is calculated as

A hydropower plant has a net head of 50 m, a discharge of 4 m³/s and an overall efficiency of 80 per cent. Its output is approximately

The net head available to a turbine is

A pumped storage scheme is best described as

A settling basin is provided in a Himalayan hydropower scheme principally to

A surge tank is provided on a long pressure tunnel in order to

The economic diameter of a penstock is the diameter at which

A draft tube is fitted to

The essential difference between an impulse and a reaction turbine is that in an impulse turbine

For a site with a head of 400 m and a small discharge, the appropriate turbine is

The turbine most commonly used in Nepali micro-hydro schemes is the

Specific speed is used in turbine selection because power

In micro-hydro schemes an electronic load controller is used in place of a mechanical governor because it simpler

Cavitation in a reaction turbine is avoided by

The solar constant is approximately

A concentrating solar collector can make use of

The term peak sun hours for a site refers to

For a fixed photovoltaic array in Nepal, the optimum annual tilt angle is approximately equal to

Shading a small part of one module in a photovoltaic string

In a thermosyphon solar water heating system, the storage tank must be placed

The electrical output of a photovoltaic module as its operating temperature rises

A monocrystalline silicon module compared with a thin film module of the same rated output will

A maximum power point tracker is used in a photovoltaic system in order to

In a photovoltaic array, connecting modules in series

A standalone solar photovoltaic system must be sized on the basis of

The depth of discharge of a lead-acid battery in a solar system is normally limited to about

Solar water pumping systems store water in a tank rather than energy in batteries because

If the wind speed at a site doubles, the power available in the wind increases by a factor of

The Betz limit states that the maximum fraction of the wind's kinetic energy that any turbine can extract is

A wind turbine installed at high altitude in Nepal will, in the same wind speed, produce

Doubling the rotor diameter of a wind turbine increases the power available by a factor of

The cut-out wind speed of a large wind turbine is typically about

Pitch regulation of a wind turbine differs from stall regulation in that pitch regulation

Turbines in a wind farm are spaced several rotor diameters apart principally to

A vertical axis wind turbine has the advantage over a horizontal axis machine that it

The average geothermal gradient in the earth's crust is approximately

The commonest type of geothermal power plant is the

A binary cycle geothermal plant is significant because it

Compared with solar and wind, geothermal power has the distinctive advantage that it

The current status of geothermal energy in Nepal is that

Biomass is described as carbon neutral, but this holds only if

The essential difference between combustion, gasification and pyrolysis is

Biodiesel is produced from vegetable oil by

In anaerobic digestion, the slowest and most sensitive stage is

The methane content of biogas from a domestic digester is typically

The fixed-dome biogas digester, the standard design in Nepal, has the advantage over the floating-drum type that it

The principal health benefit of an improved cooking stove is that it

In both galvanic and electrolytic cells

A fuel cell differs from a battery principally in that a fuel cell

A fuel cell can achieve a higher efficiency than a thermal power plant because it by the Carnot efficiency

A proton exchange membrane fuel cell is used in vehicles rather than a solid oxide fuel cell because it

The principal difficulty in storing hydrogen arises from its

Liquefaction of hydrogen for storage is energy intensive, consuming approximately

A fair comparison of the environmental impacts of different energy sources must be made

A run-of-river hydropower scheme creates a dewatered reach between the intake and the powerhouse, which is mitigated by average flow

The principal hazard associated with charging lead-acid batteries in an enclosed space is

Thermal runaway in a lithium-ion battery is particularly dangerous because extinguish

The most intractable problem associated with nuclear power is operation

The three principles of radiation protection are

A hybrid electric vehicle differs from a plug-in hybrid in that the hybrid

The claim that a battery electric vehicle is a zero-emission vehicle is accurate only

Regenerative braking gives the greatest benefit in

The feature that most distinguishes a smart grid from a conventional electricity network is

A capacitor installed for power factor correction at an industrial site consumed

Compared with a battery, a supercapacitor has

Indoor air pollution from cooking on open biomass fires is significant because it