Power Plant Engineering Set 4

Mechanical Engineering

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This set of Power Plant Engineering PPE Multiple Choice Questions & Answers (MCQs) focuses on Power Plant Engineering Set 4

Q1 | PWR stands for  
  • power
  • partially weathered rock
  • pressurized water reactor
  • packaging waste regulations
Answer: pressurized water reactor
Explaination:
pwr stands for pressurized water reactor. a pwr power plant consists of two loops in series. one is the coolant loop called primary loop and other is the water steam or working fluid loop. pressurized water reactor falls under the category of light water reactor.
Q2 | What does the top of the pressurizer in pressurized water reactor consists of at primary system pressure?
  • steam
  • air
  • water
  • fluids
Answer: steam
Explaination:
the pressurizer is a pressure vessel with a heater at the bottom and water spray at the top. the top of the pressurizer is filled with steam at primary system pressure. if the primary loop pressure drops, the heater is energized to increase the steam content in the pressurizer and thus increases the pressure of primary cooling system.
Q3 | Select the incorrect statement which supports PWR.
  • water is used as coolant
  • pwr is stable in operation
  • uses natural fuel
Answer: uses natural fuel
Explaination:
pwr uses enriched fuel
Q4 | Select the incorrect statement about PWR.
  • high primary circuit pressure requires a strong pressure vessel
  • corrosion is less in pwr
  • during fuel charging in pwr, the reactor has to be shut down at least for a month
  • pwr results in uneven heating
Answer: corrosion is less in pwr
Explaination:
presence of high temperature and high pressure water, the corrosion is severe. this means use of stainless steel adds to further costing. when γ- radiations pass through the pressure vessel it results in uneven heating which induces thermal stresses on vessels.
Q5 | LWR stands for  
  • lower water reactor
  • line water reactor
  • liquefied water reactor
  • light water reactor
Answer: light water reactor
Explaination:
the light water reactor is a type of thermal-neutron reactor that uses normal water, as opposed to heavy water, as both its coolant and neutron moderator – furthermore a solid fissile element is used as fuel. these are most common type of thermal-neutron reactors.
Q6 | In which reactor is the coolant in direct contact with the heat producing nuclear fuel?
  • fast breeder reactor
  • pressurized water reactor
  • boiling water reactor
  • heavy water reactor
Answer: boiling water reactor
Explaination:
in boiling water reactor, the coolant is in direct contact with the heat producing nuclear fuel and boils in the same compartment in which the fuel is located. the reactor pressure is maintained at 70bar. the coolant thus serves the triple function of coolant, moderato and working fluid.
Q7 | How many types of Boiling water reactor cycles are there?
  • 2
  • 3
  • 4
  • 5
Answer: 3
Explaination:
there are three different types of bwr cycles commonly used:
Q8 | Which country invented CANDU heavy water reactor?
  • canada
  • germany
  • russia
  • bolivia
Answer: canada
Explaination:
the candu is a canadian pressurized heavy water reactor design used to generate electric power. heavy water nuclear reactors and light water nuclear reactors differ in how they create and manage the complex physics of nuclear fission or
Q9 | CANDU stands for  
  • canadian natural darmstadtium uranium
  • canadian natural deuterium uranium
  • canadian natural dubnium uranium
  • canadian natural dysprosium uranium
Answer: canadian natural deuterium uranium
Explaination:
the candu, for canada deuterium uranium, is a canadian pressurized heavy water reactor design used to generate electricity. the acronym refers to its deuterium oxide (heavy water) moderator and its use of (originally natural) uranium fuel.
Q10 | Which reactor consists of both fertile and fissile material?
  • fast breeder reactor
  • pressurize water reactor
  • boiling water reactor
  • converter reactor
Answer: fast breeder reactor
Explaination:
if the reactor produces more fissionable material than it consumes, it is fast breeder reactor. the breeder fuel consists of both fertile and fissile material. the number
Q11 | What is acronym of LMFBR?
  • liquid molecular fast boiling reactor
  • liquid metal fast breeder reactor
  • liquefied metal fast boiling reactor
  • liquid metal fast boiling reactor
Answer: liquid metal fast breeder reactor
Explaination:
lmfbr stands for liquid
Q12 | GCFBR stands for  
  • gas conditioned fast breeder reactor
  • gas conditioned fast boiling reactor
  • gas cooled fast breeder reactor
Answer: gas cooled fast breeder reactor
Explaination:
the gcfbr stands for gas cooled fast breeder reactor; it is cooled by helium gas at 85bar. also helium doesn’t become radioactive under neutron bombardment and hence secondary coolant is not needed.
Q13 | Using Helium gas in GCFBR has many advantages.
  • true
  • false
Answer: true
Explaination:
using helium as coolant posses less severe metallurgical and safety problems. heat transfer coefficient of helium is much superior than sodium with artificial roughening of fuel rod surfaces. low doubling time as compared to sodium cooled reactors.
Q14 | Which reactor uses orthometaerhenyl and paratherphenyl as coolant and moderator?
  • liquid metal fast breeder reactor
  • gas cooled fast breeder reactor
  • organic substance cooled reactor
  • candu heavy water reactor
Answer: organic substance cooled reactor
Explaination:
organic substance cooled reactor uses enriched uranium as fuel and a mixture of orthometaterhenyl and paratherphenyl as coolant and moderator, and boron control rods, generating 11.4 mw capacities with an overall efficiency of 25%.
Q15 | Nuclear plant is located near the area where cooling water is available.
  • true
  • false
Answer: true
Explaination:
some of the major factors to locate a nuclear station considered are, availability of cooling water, transportation facilities, distance from load centre, safety, radioactive waste, disposal facility and foundation requirement.
Q16 | Which of the following may be used to measure the rate of nuclear disintegration?
  • geiger-muller counter
  • cold chamber
  • cyclotron
  • van de graph generator
Answer: geiger-muller counter
Explaination:
geiger-muller counter is used to measure the rate of nuclear disintegration.
Q17 | Which of the following may not need a moderator?
  • candu reactor
  • fast breeder reactor
  • homogeneous reactor
  • none of the mentioned
Answer: fast breeder reactor
Explaination:
fast breeder reactor may not need a moderator.
Q18 | Which of the following is not a naturally occurring nuclear fuel?
  • uranium-238
  • thorium-233
  • plutonium-239
  • none of the mentioned
Answer: plutonium-239
Explaination:
plutonium-239 is an artificial nuclear fuel.
Q19 | One amu is equivalent to?
  • 931 mev
  • 93.1 ev
  • 9.31 ev
  • 931 j
Answer: 931 mev
Explaination:
91 mev constitutes one amu.
Q20 | Fast breeder reactors do not  
  • use molten sodium as coolant
  • use fast neutrons for fission
  • use th-232 as fissile fuel
  • convert fertile material to fissile material
Answer: use th-232 as fissile fuel
Explaination:
fast breeder reactors do not use thorium-232 as fuel.
Q21 | A boiling water reactor is the one, in which the  
  • pressurised water is pumped into the core.
  • coolant water, after being heated in the reactor core, generates steam in a boiler
  • fuel and the coolant are thoroughly mixed to form a homogeneous solution
  • coolant water is allowed to boil in the core of the reactor
Answer: coolant water is allowed to boil in the core of the reactor
Explaination:
a boiling water reactor is the one, in which the coolant water is allowed to boil in the core of the reactor.
Q22 | Commercial power generation from fusion reactor is not yet possible, because
  • it is difficult to initiate fusion reaction
  • the fuel required (e.g. deuterium and tritium) is scarce
  • it is difficult to control fusion reaction
  • quantity of fuel required for initiating fusion reaction is prohibitively high
Answer: it is difficult to control fusion reaction
Explaination:
as fission reactions are hard to be controlled, the commercial power generation is not yet possible.
Q23 | Thermal shield is used in high powered nuclear reactors to  
  • absorb the fast neutrons
  • protect the walls of the reactor from radiation damage
  • slow down the secondary neutrons
  • protect the fuel element from coming in contact with the coolant
Answer: protect the walls of the reactor from radiation damage
Explaination:
thermal shield is used in high powered nuclear reactors to protect the walls of the reactor from radiation damage.
Q24 | Where was the first control fission of an atom carried out?
  • india
  • japan
  • russia
  • germany
Answer: germany
Explaination:
the first controlled fission of an atom was carried out in germany in 1938. nuclear fission is the splitting of the nucleus of the atom. this splitting of the nucleus results in energy that can be used for various purposes.
Q25 | Which was the first country to develop an atomic bomb?
  • russia
  • united states
  • china
  • japan
Answer: united states
Explaination:
though germany is the first country where first controlled fission of an atom was carried, united state was the first country to develop an atomic bomb, which was subsequently dropped on the japanese cities hiroshima and nagasaki.
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