590+ Energy Conversion Solved MCQs

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301.

When the power is to be transmitted over a distance of 580 km, the transmission voltage should be in the range

A. 33 kV - 66 kV
B. 66 kV - 100 kV
C. 110 kV - 150 kV
D. 150 kV - 200 kV
E. None of the above
Answer» D. 150 kV - 200 kV
discuss
302.

Geothermal energy is

A. a renewable energy source
B. an alternative energy source
C. an inexhaustible energy source
D. any of the above
E. None of the above
Answer» D. any of the above
discuss
303.

In a power plant, if the system voltage is dropped by 10 percent, the load will drop by about

A. 1 percent
B. 5 percent
C. 10 percent
D. 20 percent
E. None of the above
Answer» C. 10 percent
discuss
304.

A micro hydel project has

A. low head availability
B. low power potential
C. low discharge
D. All of the above
E. None of the above
Answer» D. All of the above
discuss
305.

Which of the following needs to be filtered in a diesel engine?

A. Air and diesel oil only
B. Air only
C. Lubrecating oil only
D. Air, diesel oil and lubricating
E. Diesel oil only
Answer» D. Air, diesel oil and lubricating
discuss
306.

All of the following are hard coals EXCEPT

A. Authracite
B. Lignite
C. Bituminous
D. Semi-bituminous
E. None of the above
Answer» B. Lignite
discuss
307.

For transmission lines the standing wave ratio is the ratio of

A. maximum foltage to minimum voltage
B. maximum current to minimum voltage
C. peak voltage to rms voltage
D. maximum reactance to minimum reactance
E. None of the above
Answer» A. maximum foltage to minimum voltage
discuss
308.

Reflecting mirrors for solar energy are known as

A. diffusers
B. ponds
C. heliostats
D. mantle
E. None of the above
Answer» C. heliostats
discuss
309.

Litz wire, is used for intermediate frequencies to overcome

A. corona effect
B. skin effect
C. radio interference
D. All of the above
E. None of the above
Answer» B. skin effect
discuss
310.

The insulators for overhead lines are generally made of

A. Porcelain
B. Wood
C. Copper
D. Plastic
E. Aluminium
Answer» A. Porcelain
discuss
311.

Which type of conductors are used for transmitting bulk of power at high voltage?

A. ACSR
B. Copper
C. Cadmium copper
D. Galvanised steel
E. Any of the above
Answer» A. ACSR
discuss
312.

The major constituent of natural gas is

A. Hydrogen
B. Carbon monoxide
C. Ammonia
D. Methane
E. Acetylene
Answer» D. Methane
discuss
313.

Long distance electric trains take power on

A. 600 V dc
B. 25 kV single phase ac
C. 25 kV two phase ac
D. 1500 V dc
E. 25 kV three phase ac
Answer» B. 25 kV single phase ac
discuss
314.

Wind form of power generation are being established at

A. Kutch
B. Tuticorin
C. J & K
D. all above places
E. None of the above
Answer» D. all above places
discuss
315.

Which lamp is used for cinerma projectors

A. Carbon arc lamp
B. Nitrogen filled GLS lamp
C. Mercury vapour lamp
D. Sodium vapour lamp
E. Frosted GLS lamp
Answer» A. Carbon arc lamp
discuss
316.

A load curve is the relationship between load on power plant with the

A. average time
B. instantaneous time
C. time in chronological order
D. algebraic sum of times
E. None of the above
Answer» C. time in chronological order
discuss
317.

Heavy water is used in a nuclear power plant as a

A. Coolant
B. Reflector
C. Fuel
D. Shield
E. Moderator
Answer» E. Moderator
discuss
318.

The power factor of a three phase induction motor at no load will be

A. 0.5 to 0.6 leading
B. 0.5 to 0.6 lagging
C. 0.2 to 0.3 lagging
D. Zero
E. 0.2 to 0.3 leading
Answer» C. 0.2 to 0.3 lagging
discuss
319.

The power factor of a load of 100 kW is to be raised from 0.5 lagging to 0.9 lagging. The KVA rating of the capacitor will be

A. 12.5
B. 212.5
C. 25
D. 125
E. 75
Answer» D. 125
discuss
320.

One kilowatt hour is equal to

A. 86,000 calories
B. 8600 calories
C. 860,000 calories
D. 8600,000 calories
E. 86,000,000 calories
Answer» C. 860,000 calories
discuss
321.

1 kilowatt hour is the same as

A. 1000 joules
B. 1000 watt-sec
C. 3600 watt-hours
D. 3600,000 watt-sec
E. 1 joule
Answer» D. 3600,000 watt-sec
discuss
322.

A 11 kV transmission line carries power to a distance of 30 kilometres. This will be termed as

A. Short transmission line
B. Medium transmission line
C. Long transmission line
D. Very long transmission line
E. None of the above
Answer» A. Short transmission line
discuss
323.

The dielectric strength of rubber is about

A. 3 kV/mm
B. 30 kV/m
C. 30 kV/cm
D. None of the above
E. All of the above
Answer» B. 30 kV/m
discuss
324.

ACSR conductor having 7 steel strands surrounded by 25 aluminium conductors will be specified as

A. 7?25
B. 7?32
C. 25?7
D. 25?32
E. None of the above
Answer» C. 25?7
discuss
325.

Compressed air is required in diesel engine power plants mainly for

A. Starting the engine
B. Cleaning
C. On fiteration
D. Water aeration
E. All of the above
Answer» A. Starting the engine
discuss
326.

The chances of corona are maximum during

A. summer heat
B. winter
C. dry water
D. humid weather
E. None of the above
Answer» D. humid weather
discuss
327.

The expected life of a GLS lamp is nearly

A. 50 hours
B. 10,000 hours
C. 5000 hours
D. 1000 hours
E. 100 hours
Answer» D. 1000 hours
discuss
328.

Neglecting losses in a transmission system, if the voltage is doubled for the same power transmission, the weight of conductor material required will be

A. four times
B. double
C. half
D. one-fourth
E. None of the above
Answer» D. one-fourth
discuss
329.

Skin effects is proportional to

A. diameter of conductor
B. (diameter of conductor)
C. (diameter of conductor)2
D. (diameter of conductor)3
E. None of the above
Answer» C. (diameter of conductor)2
discuss
330.

The thickness of the layer of insulation on a cable depends on

A. KVA
B. kW
C. Power factor
D. Voltage
E. Current carrying capacity of conductor
Answer» D. Voltage
discuss
331.

Strain type insulators are used where the conductors are

A. dead ended
B. at intermediate anchor towers
C. any of the above
D. None of the above
E. None of the above
Answer» C. any of the above
discuss
332.

Coal used in power plants is also known as

A. Charcoal
B. Coke
C. Power coal
D. Steam coal
E. Soft coal
Answer» D. Steam coal
discuss
333.

The highest point on the load curve represents

A. Maximum time
B. Maximum demand
C. Maximum concrete load
D. KVA rating of generators
E. None of the above
Answer» B. Maximum demand
discuss
334.

The voltage of a single solar cell is

A. 0.5 V
B. 1 V
C. 1.1 V
D. 2.1 V
E. None of the above
Answer» A. 0.5 V
discuss
335.

High horse power diesel engines are usually started by

A. Batteries
B. Compressed air
C. Cranking
D. Self-starter or cranking
E. Self-starter
Answer» B. Compressed air
discuss
336.

In case of humic coals, hydrogen percentage varies from

A. 4 to 6 percent
B. 10 to 15 percent
C. 16 to 20 percent
D. 20 to 30 percent
E. None of the above
Answer» A. 4 to 6 percent
discuss
337.

Which of the following motor can operate on lagging as well as leading power factor?

A. Synchronous motor
B. Universal motor
C. Reluctance motor
D. Squirrel cage induction motor
E. Capacitor run motor
Answer» A. Synchronous motor
discuss
338.

A 200 MW generator will invariably be

A. Hydrogen cooled
B. Nitrogen cooled
C. Air cooled
D. Oxygen cooled
E. Pressurised air cooled
Answer» A. Hydrogen cooled
discuss
339.

Presence of non-condensable gases in geopressured water causes

A. corrosion of parts
B. pollution
C. flow problems
D. All of the above
E. None of the above
Answer» D. All of the above
discuss
340.

Which of the following place is not associated with nuclear power plants?

A. Narora
B. Kamalappakam
C. Tarapur
D. Kora
E. Bangalore
Answer» E. Bangalore
discuss
341.

Pearlite is

A. a low ash containing coal
B. same as lignite
C. an insulation material
D. none of the above
E. None of the above
Answer» C. an insulation material
discuss
342.

The term 'critical' is associated with which type of power plant?

A. Gas turbine power plant
B. Steam power plant
C. Hydro-electric power plant
D. Diesel engine power plant
E. Nuclear power plant
Answer» E. Nuclear power plant
discuss
343.

Reverse capacity of a plants is given by

A. Maximum demand - Average demand
B. Plant capacity - Maximum demand
C. Plant capacity - Average demand
D. Plant capacity x (1 - Load factor)
E. None of the above
Answer» B. Plant capacity - Maximum demand
discuss
344.

The standard wattage of 4 feet fluorescent tube is

A. 500 W
B. 250 W
C. 10 W
D. 40 W
E. 100 W
Answer» D. 40 W
discuss
345.

Standed conductors are used for transmitting power at high voltages because of

A. increased tensile strength
B. low cost
C. case in handling
D. low wind resistance
E. None of the above
Answer» C. case in handling
discuss
346.

In a transmission line if booster transformer is to be used, the preferred location will be

A. at the receiving end
B. at the sending end
C. at the intermediate point
D. anywhere in the line
E. None of the above
Answer» C. at the intermediate point
discuss (1)
347.

For the same wattage, which of the following lamp is cheapest?

A. Fluorescent tube 2 ft.
B. GLS lamp
C. Fluorescent tube 4 ft.
D. Mercury vapour lamp
E. Sodium vapour lamp
Answer» B. GLS lamp
discuss
348.

One British thermal unit (BTU) is nearly equal to

A. 252 joules
B. 2106 joules
C. 243 joules
D. 1053 joules
E. 504 joules
Answer» D. 1053 joules
discuss
349.

At which of a following speed the generators for 3 phase, 50 Hz supply will not run?

A. 1200 rpm
B. 500 rpm
C. 250 rpm
D. 166? rpm
E. 750 rpm
Answer» A. 1200 rpm
discuss
350.

The specific gravity of diesel oil is closer to

A. 2.7
B. 0.35
C. 1
D. 0.84
E. 1.35
Answer» D. 0.84
discuss
351.

Which type of insulators are used on 132 kV transmission lines?

A. Pin type
B. Disc type
C. Shackle type
D. Pin and shackle type
E. None of the above
Answer» B. Disc type
discuss
352.

Gamma rays are

A. high energy, short wavelength electromagnetic radiation
B. high energy, long wavelength electromagnetic wavelength
C. low energy, long wavelength electromagnetic radiation
D. low energy, short wavelength electromagnetic radiation
E. None of the above
Answer» A. high energy, short wavelength electromagnetic radiation
discuss
353.

Baume's scale measures

A. purity of water
B. radioactivity
C. specific gravity of liquids
D. specific gravity of gases
E. None of the above
Answer» C. specific gravity of liquids
discuss
354.

The depreciation rate for an equipment is generally decided in light of

A. Sales tax rules
B. Excise duty rules
C. Income tax rules
D. Electricity duty rules
E. None of the above
Answer» C. Income tax rules
discuss
355.

Which of the following is an advantage of using static capacitors of power factor improvement?

A. Low losses within the capacitors
B. No rotating parts
C. Can be easily installed
D. Can work under normal atmospheric conditions
E. All of the above
Answer» E. All of the above
discuss
356.

Skin effects depends upon

A. size of the conductor
B. frequency of the current
C. resistivity of the conductor
D. All of the above
E. None of the above
Answer» D. All of the above
discuss
357.

If a diesel engine has a turbochanger, it can be concluded that the engine is

A. Pressure lubricated
B. Double acting type
C. Air cooled type
D. Supercharged type
E. High speed type
Answer» D. Supercharged type
discuss
358.

Which of the following factor affects corona?

A. Atmospheric conditions
B. Conductor size
C. Spacing between conductors
D. Line voltage
E. All of the above
Answer» E. All of the above
discuss
359.

The function of steel wire in a ACSR conductor is

A. to take care of voltage surges
B. to prevent corona
C. to reduce inductance and hence improve power factor
D. to provide additional mechanical strength
E. None of the above
Answer» D. to provide additional mechanical strength
discuss
360.

Which of the following method can be used for heating wood?

A. Oil burner heating
B. Carbon arc heating
C. Tungsten arc heating
D. Resistance heating
E. Dielectric heating
Answer» E. Dielectric heating
discuss
361.

Sag is provided in overhead transmission lines so that

A. Repairs can be done easily
B. Corona can be reduced
C. Skia effect can be reduced
D. Safe tension is not exceeded
E. None of the above
Answer» D. Safe tension is not exceeded
discuss
362.

A chimney is not a part of which of the following type of power plant?

A. Steam power plant
B. Diesel engine power plant
C. Gas turbine power plant
D. Hydro-electric power plant
E. All of the above
Answer» D. Hydro-electric power plant
discuss
363.

Fixed carbon in case of biogas is around

A. 12.5 percent
B. 25 percent
C. 40 percent
D. 68 percent
E. None of the above
Answer» A. 12.5 percent
discuss
364.

the main cause of power loss in a transmission line is

A. Resistance
B. capacitance is negligible
C. Inductance
D. Both inductance and capacitance
E. None of the above
Answer» A. Resistance
discuss
365.

In hydrothermal systems when steam water and dissolved solids are available as source of energy, the entrained solids are removed by

A. filters
B. centrifugal separators
C. strainers
D. None of the above
E. None of the above
Answer» B. centrifugal separators
discuss
366.

Steel poles used for telephone lines are generally

A. painted
B. plated
C. galvanized
D. blackened
E. None of the above
Answer» C. galvanized
discuss
367.

Raniganj is famous for

A. Thorium deposits
B. Oil fields
C. LPG
D. Coal
E. None of the above
Answer» D. Coal
discuss
368.

The chemical composition of coal is given by

A. Proximate analysis
B. Ultimate analysis
C. Orsat analysis
D. All of the above
E. None of the above
Answer» B. Ultimate analysis
discuss
369.

If 3 MW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be

A. 11 kV
B. 33 kV
C. 66 kV
D. 132 kV
E. None of the above
Answer» B. 33 kV
discuss
370.

The power factor of a 3 phase induction motor will be least

A. at no load
B. at 80% load
C. at 25% load
D. at full load
E. at 5% load
Answer» A. at no load
discuss
371.

A 132 kV transmission line carrying power through a distance of 250 kilometers will be termed as

A. Very short transmission line
B. Short transmission line
C. Long transmission line
D. Trunk line
E. None of the above
Answer» C. Long transmission line
discuss
372.

In a hydroelectric plant a conduit-system for taking water from the intake work to the turbine is known as

A. Penstock
B. Dam
C. Reservoir
D. Surge tank
E. Flume
Answer» A. Penstock
discuss
373.

Most power generating units are conservatively rated. For short durations, these units can be easily overloaded by about

A. 1 to 2 percent
B. 10 to 15 percent
C. 25 to 30 percent
D. 40 to 50 percent
E. None of the above
Answer» B. 10 to 15 percent
discuss
374.

Therm is a unit of

A. radioactivity
B. heating value
C. wind speed
D. tidal wave
E. None of the above
Answer» B. heating value
discuss
375.

In a fluorescent tube circuit, choke acts as a

A. A starter
B. A source of heat
C. A device for improving the power factor
D. A current limiting device
E. None of the above
Answer» D. A current limiting device
discuss
376.

soot is virtually nothing but

A. ash
B. cinder
C. gas
D. carbon
E. None of the above
Answer» D. carbon
discuss
377.

Which of the following is not needed in megneto hydrodynamic power plants?

A. Chimney
B. Combustor
C. Steam turbine
D. Fuel
E. None of the above
Answer» C. Steam turbine
discuss
378.

A four stroke petrol engine is designed to develop 35 BHP at 200 RPM. It has an indicated mean effective pressure of 20 kg/cm2, a stroke of 35 cm and a bore diameter of 20 cm. Using this data mechanical efficiency of the engine at the running condition given would be closest to

A. 50 percent
B. 60 percent
C. 70 percent
D. 80 percent
E. None of the above
Answer» C. 70 percent
discuss
379.

Particles having the same atomic number but different mass unmbers are called

A. Beta particles
B. Positrons
C. Isotopes
D. Ions
E. Decayed particles
Answer» C. Isotopes
discuss
380.

Careful handling of fuel is essential for which of the following power plant?

A. Hydro-electric power plant
B. Diesel engine power plant
C. Gas turbine power plant
D. Steam power plant
E. Nuclear power plant
Answer» E. Nuclear power plant
discuss
381.

High load factor can be expected in

A. power plants near load centre
B. slow speed power plants
C. multi-unit power plants
D. base load stations
E. None of the above
Answer» D. base load stations
discuss
382.

Flash generally results from

A. gas turbines
B. diesel engines
C. pulverized coal boilers
D. fluidized bed boilers
E. None of the above
Answer» C. pulverized coal boilers
discuss
383.

A load curve helps in deciding

A. size of the generating units
B. total installed capacity of the plant
C. operating schedule of the generating units
D. All of the above
E. None of the above
Answer» D. All of the above
discuss
384.

In any transmission line

A. ?BC = 1 - AD
B. AC - BD = -1
C. AB = CD + 1
D. AC = BD + 1
E. AB - CD = -1
Answer» A. ?BC = 1 - AD
discuss
385.

The device used to generate power utilising energy of wind is called

A. Air motor
B. Aerogenerator
C. Windmill
D. Wind generagor
E. None of the above
Answer» C. Windmill
discuss
386.

Pea coal is

A. anthracite coal, small in size
B. same as peat
C. low ash content lignite
D. none of the above
E. None of the above
Answer» A. anthracite coal, small in size
discuss
387.

Air curtains find applications in

A. air conditioned spaces
B. green houses
C. nuclear power plants
D. solar energy system
E. None of the above
Answer» A. air conditioned spaces
discuss
388.

A current of 10 milli-amperes through human body

A. will cause mild sensation
B. will affect muscle control
C. will affect breathing
D. will cause death
E. None of the above
Answer» A. will cause mild sensation
discuss
389.

A curve showing the variation of load on a power station with respect to time is known as

A. Flow chart
B. Performance curve
C. Load curve
D. Diversity factor
E. Load duration curve
Answer» C. Load curve
discuss
390.

Nagarjunsagar dam has been constructed on river

A. Kali
B. Krishna
C. Kaveri
D. Charnbal
E. Mahanadi
Answer» B. Krishna
discuss
391.

The location of which power plant is mainly decided by the geographical factors?

A. Diesel engine power plant
B. Hydro-electric power plant
C. Steam power plant
D. Nuclear power plant
E. Gas turbine power plant
Answer» B. Hydro-electric power plant
discuss
392.

In petrothermal systems of geothermal energy there is hot dry rock but no underground water. In such systems energy is obtained by

A. circulating compressed air
B. pumping water
C. creating water wells
D. None of the above
E. None of the above
Answer» B. pumping water
discuss
393.

A fast breeder reactor

A. operates with fast neutrons and produces less fissionable material than it consumes
B. operates with fast neutrons and produces more fissionable material than it consumes
C. operates with slow neutrons and produces less fissionable material than it consumes
D. operates with slow neutrons and produces more fissionable material than it consumes
E. None of the above
Answer» B. operates with fast neutrons and produces more fissionable material than it consumes
discuss
394.

The current down by the transmission line due to corona losses is

A. sinusoidal
B. square
C. non-sinusoidal
E. None of the above
Answer» C. non-sinusoidal
discuss
395.

In a transmission line following are the distributed parameters

A. resistance and inductance only
B. resistance, inductance and capacitance
C. resistance, inductance, capacitance and short conductance
E. None of the above
Answer» C. resistance, inductance, capacitance and short conductance
discuss
396.

The effect of ice deposition on conductor is

A. increased skin effect
B. reduced corona losses
C. increased weight
D. reduced sag
E. None of the above
Answer» C. increased weight
discuss
397.

Illumination due to moonlight is nearly

A. 18 lumens/meter2
B. 300 lumens/meter2
C. 0.3 lumen/meter2
D. 1.8 lumens/meter2
E. 30 lumens/meter2
Answer» C. 0.3 lumen/meter2
discuss
398.

Which of the following place is not associated with hydro-electric power plants?

A. Bhakra
B. Farakka
C. Koyana
D. Singrauli
E. Nagarjunsagar
Answer» D. Singrauli
discuss
399.

The speed of the primemover is controlled by

A. cam shaft
B. feed pump
C. regulator
D. governor
E. None of the above
Answer» D. governor
discuss
400.

The expected life of wooden pols for transmission line is

A. 30 to 60 years
B. 20 to 25 years
C. 5 to 8 years
D. 1 to 2 years
E. 2 to 5 years
Answer» B. 20 to 25 years
discuss

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