Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.

The working fluid chosen by Anderson OTEC cycle is ______(a) Propane(b) Water(c) Engine oil(d) ISO-butaneThis question was posed to me by my college professor while I was bunking the class.I need to ask this question from Ocean Thermal Energy Conversion topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct choice is (a) Propane

The explanation is: The WORKING fluid chosen by Anderson OTEC cycle is propane. The operating pressures of such fluid at the boiler condenser temperatures are MUCH higher than those of water being ROUGHLY 10 bars at the boiler, and their SPECIFIC volumes are much lower, being comparable to those of steam in conventional POWER plants.

52.

Which of the following has the lowest efficiency?(a) Solar energy(b) Wind energy(c) Wave energy(d) OTECI got this question during an online exam.I want to ask this question from Ocean Thermal Energy Conversion in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct choice is (d) OTEC

The best explanation: OTEC POWER generation gives less efficiency. However, because of the OTEC requirement for parasitic power and other losses, the ACHIEVABLE NET conversion efficiencies of 30 to 40% associated with CONVENTIONAL power plants.

53.

How many basins does a single pool tidal system have?(a) 1(b) 2(c) 3(d) 4I had been asked this question in unit test.Query is from Tidal Power in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (a) 1

Explanation: The simple SINGLE pool TIDAL system has one pool or basin behind a dam that is FILLED from the ocean at high tide and EMPTIED to it at LOW tide. Both filling and emptying processes take place during short periods of time.

54.

Does harnessing of geothermal energy cause earthquakes.(a) True(b) FalseI have been asked this question by my school principal while I was bunking the class.My question is from Problems Associated with Geothermal Conversion in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right option is (a) True

The best I can explain: Some fears have been expressed that PROLONGED geothermal exploitation could trigger off earth QUAKES ESPECIALLY if reinjection is practiced in ZONES of HIGHER shear stresses where fairly large temperature differentiation occurs.

55.

Which geothermal system utilizes relatively low temperature heat of geothermal sources?(a) Hybrid geothermal Fossil system(b) Flashed steam system(c) Liquid dominated total flow concept(d) Petro thermal systemsThe question was asked in a national level competition.My question is from Hydrothermal Systems in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct answer is (a) Hybrid geothermal FOSSIL system

The explanation is: The hybrid geothermal fossil fuel systems utilizes the relatively low temperature heat of geothermal SOURCES in the low temperature END of a conventional cycle and the high temperature heat from fossil fuel combustion in the high temperature cycle with a natural source of heat for part of heat addition, thus reducing the CONSUMPTION if the expensive and non RENEWABLE fossil fuels.

56.

The withdrawal of large amounts of steam from a hydrothermal reservoir may result in ____________(a) landslides(b) surface subsidence(c) light surface(d) loss of land fertilityThe question was asked in class test.I would like to ask this question from Hydrothermal Systems topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (b) surface subsidence

For explanation: The WITHDRAWAL of large amounts of steam from a hydrothermal reservoir may result in surface subsidence. Such subsidences have SOMETIMES OCCURRED in oil fields and are DEALT with injecting water into the ground.

57.

How much percent of Non-condensable gases are contained in steam?(a) 0.5 – 5%(b) 10 – 25%(c) 75 – 85%(d) 50%I had been asked this question in an online quiz.This key question is from Hydrothermal Systems topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct option is (a) 0.5 – 5%

Easy explanation: The steam contains 0.5 – 5% by weight of non-condensable gases which APPEAR in the TURBINE EXHAUST. These gases consist mainly of carbon dioxide with small amounts of methane and ammonia, which are largely HARMLESS in the quantities PRESENT.

58.

A spring that shoots jets of hot water and steam into the air is called as _______(a) Mine hole(b) Geyser(c) Hot spring(d) Mud potI have been asked this question in an international level competition.The query is from Geothermal Energy topic in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer» CORRECT choice is (b) Geyser

Easy explanation: Geysers are temporary GEOLOGICAL features. Geysers are generally associated with volcanic areas. As the water boils, the resulting pressure FORCES a superheated column of steam and water to the SURFACE through the geyser’s internal plumbing.
59.

Select the correct formula of kinetic energy of a wave?(a) \(\frac{KE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\)(b) KE = \(\frac{1}{4}ρa^2 × \frac{g}{g_c}\)(c) KE = \(\frac{1}{4}ρa^2\)(d) \(\frac{KE}{A} = \frac{1}{4}ρa^2\)I had been asked this question during an interview.This question is from Wave Energy topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right OPTION is (a) \(\frac{KE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\)

The best explanation: The CORRECT formula for kinetic energy of a wave is \(\frac{KE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\).

g = gravitational acceleration, m/s^2

gc = conversion factor

ρ = WATER density

a = amplitude

A = λL in J/m^2.

60.

Earth’s outer layer rock is called as __________(a) Mantle(b) Crust(c) Outer core(d) AsthenosphereThe question was posed to me by my college director while I was bunking the class.I'd like to ask this question from Geothermal Energy in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right CHOICE is (b) Crust

Easy explanation: Earth’s crust is Earth’s hard outer layer. It is less than 1% of Earth’s volume. The crust is made up of different types of ROCKS: igneous, metamorphic, and SEDIMENTARY rocks. Crust is also called as lithosphere.

61.

A continuous movement of water in specific direction is called as _________(a) float(b) waves(c) current(d) tidesI had been asked this question in my homework.This key question is from Ocean Thermal Energy Conversion in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right answer is (d) tides

To ELABORATE: Water currents can be found in STREAMS, rivers and oceans THROUGHOUT the world. Water current is the rate of MOVEMENT in the water, and ways to describe water current include its SPEED and direction. There are different types of water currents which behave in different ways because they are affected by separate variables.

62.

A _______ attached to the float moves up and down inside a cylinder.(a) chain(b) barrel(c) piston(d) loadI got this question during an interview.My doubt is from Wave Energy topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct CHOICE is (C) piston

The explanation is: A piston attached to the FLOAT moves up and down inside a CYLINDER, FIXED to the platform and is therefore relatively stationary. This piston cylinder arrangement is used as a reciprocating air compressor.

63.

Select the correct formula of potential energy in wave energy?(a) \(\frac{PE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\)(b) PE = \(\frac{1}{4}ρa^2 × \frac{g}{g_c}\)(c) \(\frac{A}{PE} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\)(d) \(\frac{PE}{A} = \frac{1}{4}\)ρa^2 × gThis question was addressed to me in a job interview.I need to ask this question from Wave Energy topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer» CORRECT CHOICE is (a) \(\frac{PE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\)

EXPLANATION: \(\frac{PE}{A} = \frac{1}{4}ρa^2 × \frac{g}{g_c}\) is the correct formula for the potential energy of a wave.

g = gravitational acceleration, m/s^2

gc = CONVERSION factor

ρ = water density

a = amplitude

A = λL in J/m^2.
64.

What type of tide is it if the difference between high and low tide is greatest?(a) Diurnal tide(b) Neap tide(c) Spring tide(d) Ebb tideThe question was posed to me in a national level competition.My question is from Tidal Energy in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct option is (c) Spring tide

To elaborate: The tide that occurs when the difference between high and low tides is GREATEST. It occurs when the MOON is NEW or FULL. Spring tides result when the gravitation forces of the sun and moon are parallel to one another.

65.

One Terra-watt is equal ______________(a) 1 trillion-watts(b) 100 trillion-watts(c) 5 trillion-watts(d) 10 trillion-wattsThe question was asked in an interview for internship.This question is from Tidal Power topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (a) 1 trillion-watts

The best I can explain: ONE terra-watt is EQUAL to 1 trillion watts. One terawatt hour of energy is equal to a sustained power delivery of approximately 114 megawatts for a period of one year. The watt SECOND is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds.

66.

Any location where the fresh water meets salty water is called _________(a) Dredging(b) River(c) Delta(d) EstuaryThis question was addressed to me in homework.This interesting question is from Tidal Power in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right answer is (d) Estuary

The explanation: Any location where fresh river water meets salty ocean water. The word “estuary” is derived from the Latin word aestuarium meaning tidal inlet of the SEA, which in itself is derived from the term aestus, meaning tide. ESTUARIES are critical HABITAT for spawning and early life CYCLE stages of many ocean organisms as WELL as birds.

67.

Which is the environmental problem caused by geothermal energy?(a) Landslide(b) Loose soil(c) Land surface subsidence(d) Loss of fertility of landThis question was addressed to me in a job interview.This intriguing question comes from Problems Associated with Geothermal Conversion topic in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct CHOICE is (c) Land surface subsidence

The best I can explain: Environmental problem caused by geothermal plants is land surface subsidence because of the extraction of large QUANTITIES of underground FLUIDS. Large extractions and re-injections also POSE POSSIBILITY of seismic disturbances.

68.

How is OTEC caused?(a) By wind energy(b) By geothermal energy(c) By solar energy(d) By gravitational forceI have been asked this question in an interview for internship.This key question is from Tidal Energy in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right choice is (c) By solar energy

Easiest explanation: OTEC is CAUSED by solar energy indirectly. Of LATE HARNESSING tidal and wave energy has GAINED MOMENTUM. While OTEC has its own limitations, wave and tidal energy conversion systems can generate more energy when compared to solar energy.

69.

What is the term used for transport of non-cohesive sediments?(a) Dirt drop(b) Flick(c) Littoral drift(d) Droplet driftsThe question was asked in an online quiz.My doubt is from Tidal Power topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct choice is (C) Littoral drift

The explanation is: Littoral transport is the term USED for the transport of non-cohesive sediments, i.e. MAINLY sand, along the foreshore and the shore face due to the ACTION of the breaking waves and the LONG shore currents.

70.

What is time period for one tide to occur in a day?(a) 6h, 12.5 min(b) 6h, 40.5 min(c) 6h, 0 min(d) 6h, 25.6 minI have been asked this question in my homework.The origin of the question is Tidal Power topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer» RIGHT option is (a) 6H, 12.5 min

Easiest explanation: The flow of water in both directions is used to drive a NUMBER of reversible water turbines, each driving an ELECTRICAL GENERATOR. Electric power would thus be generated during two short periods each tidal period of 12h, 25min or once every 6h, 12.5 min.
71.

Which gas is always present in geothermal fields?(a) CO2(b) H2S(c) N2O(d) H2OThis question was addressed to me in exam.My doubt stems from Problems Associated with Geothermal Conversion in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct option is (b) H2S

The explanation is: H2S (Hydrogen Sulfide) is always present in geothermal FIELD. If this gas is present in excess quantities may cause harmful EFFECTS on the bearings. This also attacks ELECTRICAL equipments and it may have ADVERSE effects on corps and on river life.

72.

Which material is recommended for condensate pipes?(a) Cast iron(b) Aluminum(c) Copper(d) SteelI have been asked this question in quiz.I need to ask this question from Problems Associated with Geothermal Conversion topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (b) Aluminum

To elaborate: Aluminum is recommended for condensate pipes and valves that are MADE large enough to allow LOW velocities and hence EROSION. Aluminum is ALSO recommended for switchyard structures that are in the OPEN but in a generally corrosive atmosphere.

73.

Which geothermal systems are composed of hot dry rock (HDR) but no underground water?(a) Hybrid geothermal Fossil system(b) Flashed steam system(c) Liquid dominated total flow concept(d) Petro thermal systemsThis question was addressed to me in class test.This intriguing question comes from Hydrothermal Systems in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct ANSWER is (d) Petro thermal systems

Explanation: Petro thermal systems are composed of hot dry ROCK (HDR) but no underground WATER. They are largest geothermal resource available. The rock occurring at moderate depths has very low permeability and needs to be increasing its HEAT transfer surface.

74.

The hole on earth’s surface from where the steam from the earth comes out is called as ________(a) Gash(b) Mud pot(c) Void(d) FumaroleI got this question by my school teacher while I was bunking the class.This is a very interesting question from Geothermal Energy in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right choice is (d) FUMAROLE

Best explanation: A fumarole is an opening in a planet’s crust, often in areas SURROUNDING volcanoes, which emits steam and GASES such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam forms when superheated water condenses as its PRESSURE DROPS when it emerges from the ground.

75.

Which kind geothermal plant is most common type?(a) Dry steam(b) Flash(c) Binary(d) Wet steamI got this question during a job interview.I need to ask this question from Geothermal Energy topic in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct choice is (B) FLASH

The BEST explanation: Flash Steam Power Plants are the most common form of geothermal power plant. The HOT water is pumped under great pressure to the SURFACE. When it reaches the surface the pressure is reduced and as a result some of the water changes to steam. This produces a ‘blast’ of steam. The cooled water is returned to the reservoir to be heated by geothermal rocks again.

76.

In which wave machine instead of compressing air, the water itself is pressurized?(a) High level reservoir wave machine(b) Dolphin type wave generator(c) Hydraulic accumulator(d) Float wave power conversion deviceThe question was posed to me in class test.Question is taken from Wave Energy topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (c) HYDRAULIC accumulator

The BEST explanation: Hydraulic accumulator wave MACHINES, INSTEAD of compressing air, the water itself is pressurized and stored in a high PRESSURE accumulator or pumped to a high level reservoir, from which it flows through a water turbine electric generator.

77.

Kinetic energy that results from the oscillation of water is called ________(a) Wave energy(b) Tidal energy(c) Ocean thermal energy(d) Hydro energyI had been asked this question during an online interview.The question is from Wave Energy topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct CHOICE is (a) WAVE energy

Easiest explanation: Kinetic energy that results from the oscillation of water is CALLED wave energy. Wave energy is derived from wind energy, which derives in turn from SOLAR energy. Wave energy can be MUCH more concentrated than the solar energy.

78.

How many essentially infinite heat reservoirs are present in tropical waters?(a) 1(b) 2(c) 3(d) 4This question was posed to me in unit test.My question is taken from Ocean Thermal Energy Conversion topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct option is (B) 2

The best explanation: In TROPICAL waters, there are TWO essentially infinite heat reservoirs, a heat source at the surface at about 27^oC and heat sink some 1 Km directly below, at about 4^oC, both reservoirs are maintained by solar INCIDENCE.

79.

The Claude cycle is also called as __________(a) Open cycle(b) Anderson cycle(c) Closed cycle(d) Otto cycleI got this question in quiz.My enquiry is from Ocean Thermal Energy Conversion in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer» CORRECT option is (a) Open cycle

Easy explanation: A Claude cycle is also called as open cycle in which sea WATER itself PLAYS, the multiple role of heat source, working fluid and heat sink. In this cycle warm water at 27°C is ADMITTED into an EVAPORATOR in which the pressure is maintained at a value slightly below the saturation pressure corresponding to that of water temperature.
80.

What is range of temperature at Hydro thermal reservoirs?(a) 350^oC(b) 210^oC(c) 50^oC(d) 1900^oCThis question was posed to me in quiz.My question is taken from Hydrothermal Systems topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The CORRECT choice is (a) 350^oC

The best EXPLANATION: Hydrothermal resources are wet reservoirs at moderate depths containing steam and hot water under pressure at temperatures upto about 350^oC. These systems are further subdivided DEPENDING upon whether steam or hot water is DOMINANT PRODUCT.

81.

How many number of manifolds are part of a platform of floating device?(a) 1(b) 2(c) 3(d) 4This question was addressed to me in semester exam.Question is taken from Wave Energy topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer» CORRECT OPTION is (d) 4

The best I can EXPLAIN: There are four manifolds that are part of a platform. There are four LARGE under water floatation TANKS which stabilize the platform. Platform is supported by buoyancy forces and no vertical or horizontal displacement occurs due to wave action.
82.

Motion of water in a wave is primarily ________(a) Vertical(b) Horizontal(c) Linear(d) OppositeI got this question in an internship interview.My query is from Wave Energy in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct choice is (a) Vertical

To elaborate: Wave motion is primarily horizontal but the motion of the water is vertical. Mechanical POWER is OBTAINED by floats making use of the motion of water. The CONCEPT visualizes a large force that is driven up and down by the water within RELATIVELY stationary GUIDES.

83.

A tide whose difference between high and low tides is least is called as __________(a) Diurnal tide(b) Neap tide(c) Spring tide(d) Ebb tideThe question was posed to me in homework.I need to ask this question from Tidal Energy in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct choice is (b) Neap TIDE

To elaborate: A tide that OCCURS when the DIFFERENCE between HIGH tide and low tide is the least. Neap tides occur when gravitational forces from the sun and moon are at right ANGLES (perpendicular) to one another.

84.

Which of the following can affect the fisheries in river?(a) Heat pollution(b) Noise pollution(c) Land erosion(d) Air borne poisonsThis question was posed to me during an internship interview.This intriguing question originated from Problems Associated with Geothermal Conversion topic in division Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

The correct answer is (a) Heat pollution

The best I can explain: Heat pollution in river WATER can damage fisheries and encourage growth of unwanted water weeds. Possible REMEDIES include re-injection of SURPLUS cooling tower water and unwanted bore water, the generation of additional power by MEANS of binary fluid cycles etc.

85.

How are solids present in steam and water of geothermal energy removed?(a) Flocculation(b) De-sanding Hydro clones(c) Centrifugal separators(d) Gravity settingI got this question in examination.My question is from Problems Associated with Geothermal Conversion in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer»
86.

What types of tides occur when there is so much interference with continents?(a) Diurnal tide(b) Neap tide(c) Spring tide(d) Ebb tideThe question was posed to me in exam.The query is from Tidal Energy in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct option is (a) Diurnal tide

The explanation is: Diurnal tides occur when there is so much INTERFERENCE by continents, only one high tide and one low tide occur PER day. This diurnal tide has a period of 24 HRS and 50 min. An AREA has a diurnal tidal cycle if it experiences one high and one low tide every lunar day.

87.

What does EGS stand for in geothermal energy?(a) Engraved Geothermal systems(b) Enhanced geothermal system(c) Exhaust gas system(d) Engineered geo physical systemThe question was asked during an online interview.I'm obligated to ask this question of Geothermal Energy in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct option is (b) Enhanced geothermal SYSTEM

The explanation: The development of a geothermal system where hydraulic fracturing of the system can allow the production at a COMMERCIAL level. EGS’s are engineered RESERVOIRS created where there is geothermal energy but a lack of permeability. Fluid is injected into the earth‘s SURFACE which causes pre-existing FRACTURES to open again, creating permeability. Nationwide potential with engineered reservoirs 6-km to 8-km deep.

88.

How is water trapped from coastal waters?(a) By building canals(b) By building dams(c) By digging wells(d) By storing in tanksThis question was addressed to me during an online interview.Asked question is from Tidal Energy topic in section Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right CHOICE is (b) By building dams

For explanation I would say: The tides are ONE of the sources of energy from the oceans. This energy can be tapped from coastal waters by building dams. Dams ENTRAP the water at high TIDE and release it at low tide back to the SEA.

89.

What is the movement of water away from the shore called?(a) Flood tide(b) Spring tide(c) Ebb tide(d) Neap tideThe question was posed to me by my college professor while I was bunking the class.My question is from Tidal Power topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Right answer is (C) Ebb tide

For explanation: Movement of water away from the shore is called ebb tide. Ebb tide means the PERIOD between HIGH tide and low tide during which water flows away from the shore, the RECEDING or outgoing tide. The period between high water and the SUCCEEDING low water.

90.

What tide of tide is it called when two high tides and two low tides of approximately equal size occur?(a) Diurnal tide(b) Spring tide(c) Neap tide(d) Semi-Diurnal tideThis question was posed to me by my college director while I was bunking the class.My enquiry is from Tidal Power topic in portion Ocean Energy & Geothermal Energy of Energy Engineering

Answer»

Correct ANSWER is (d) Semi-Diurnal tide

To explain: An area has a semidiurnal tidal cycle if it experiences two high and two low TIDES of approximately equal size EVERY lunar DAY. Semidiurnal tides may have daily inequity, where successive high tides have DIFFERENT heights.