Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 91 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

A fast breeder reactor uses following as fuel_________________?
A. enriched uranium
B. plutonium
C. thorium
D. U235
E. natrual uranium
Answer» E. natrual uranium
Discussion
2.

The most commonly used moderator in nuclear plants is___________________?
A. heavy water
B. concrete and bricks
C. graphite and concrete
D. deutrium
E. graphite
Answer» F.
Discussion
3.

Enriched uranium may contain fissionable contents of the order of__________________?
A. 1-99%
B. 1-25%
C. 1-50%
D. 1-75%
E. 1-90%.
Answer» B. 1-25%
Discussion
4.

Electron-volt is the unit of________________?
A. atomic power
B. energy
C. voltage
D. radio activity
E. there is no such unit
Answer» C. voltage
Discussion
5.

Which is not identical for an atom and an isotope_________________?
A. mass number
B. atomic number
C. chemical properties
D. position in periodic table
E. all of the above
Answer» B. atomic number
Discussion
6.

Atomic number of an element in the periodic table represents the numbers of_________________?
A. protons in the nucleus
B. electrons in me nucleus
C. neutrons in the nucleus
D. electrons in the atom
E. neutrons in the atom
Answer» B. electrons in me nucleus
Discussion
7.

Reflector in nuclear plants is used to________________?
A. return the neutrons back into the core
B. shield the radioactivity completely
C. check polllution
D. conserve energy
E. is not used
Answer» B. shield the radioactivity completely
Discussion
8.

The total energy released in fission of U is__________________?
A. 5 MeV
B. 10 MeV
C. 199 MeV
D. 168 MeV
E. 11 MeV
Answer» D. 168 MeV
Discussion
9.

A nuclear unit becoming critical means_______________?
A. it is generating power to rated capacity
B. it is capable of generating much more than rated capacity
C. there is danger of nuclear spread
D. chain reaction that causes automatic splitting of the fuel nuclei has been established
E. it generates no heat
Answer» E. it generates no heat
Discussion
10.

One gram of uranium will produce energy equivalent to approximately____________________?
A. 1 tonne of high grade coal
B. 4.5 tonnes of high grade coal
C. 10 tonnes of high grade coal
D. 100 tonnes of high grade coal
E. 1000 tonnes of high grade coal
Answer» C. 10 tonnes of high grade coal
Discussion
11.

Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
A. is lighter
B. is inert
C. has high specific heat
D. is a good conductor
E. all of the above
Answer» D. is a good conductor
Discussion
12.

Boiling water reactor employs__________________?
A. boiler
B. direct cycle of coolant system
C. double circuit system of coolant cycle
D. multi pass system
E. single circuit system
Answer» C. double circuit system of coolant cycle
Discussion
13.

Breeder reactor has a conversion ratio of_____________________?
A. unity
B. more than unity
C. less than unity
D. zero
E. infinity
Answer» C. less than unity
Discussion
14.

The risk of radioactive hazard is greatest in the turbine with following reactor___________________?
A. pressurised water
B. boiling water
C. gas cooled
D. liquid metal cooled
E. all of the above
Answer» C. gas cooled
Discussion
15.

A reactor capable of converting a ferrite material into fissile isotopes is called____________________?
A. regenerative reactor
B. fast breeder reactor
C. breeder reactor
D. boiling water reactor
E. ferrite reactor
Answer» B. fast breeder reactor
Discussion
16.

Natural uranium is made up of__________________?
A. 99.282% U238, 0.712% U235, 0.006% U234
B. 99.282% U235, 0.712% U238, 0.06%’ U234
C. 99.282% U234, 0.712% U238, 0.006% U235
D. 99.282% U235, 0.712% U234, 0.006% U238
E. none of the above
Answer» B. 99.282% U235, 0.712% U238, 0.06%’ U234
Discussion
17.

Plutonium is produced________________?
A. as basic raw material
B. by neutron irradiation of Uz
C. by neutron irradiation of throium
D. artificially
E. in high capacity furnace
Answer» C. by neutron irradiation of throium
Discussion
18.

Uranium-233 is produced__________________?
A. as basic raw material
B. by neutron irradiation of Uz
C. by neutron irradiation of thorium
D. artificially
E. in high capacity furnaces
Answer» D. artificially
Discussion
19.

The unit of radio-activity is_____________?
A. electron-volt
B. electron-ampere
C. curie
D. MeV
E. AMU
Answer» D. MeV
Discussion
20.

Pick up the wrong statement Fast breeder reactors__________________?
A. operate at extremely high power densities
B. are liquid-metal cooled
C. produce more fuel than they consume
D. are unmoderated
E. use water as coolant
Answer» F.
Discussion
21.

The commonly used material for shielding is__________________?
A. lead or concrete
B. lead and tin
C. graphite or cadmium
D. thick galvanised sheets
E. black carbon papers
Answer» B. lead and tin
Discussion
22.

The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?
A. 1 MeV
B. 2.4 MeV
C. 4.3 MeV
D. 7.8 MeV
E. 20 MeV
Answer» E. 20 MeV
Discussion
23.

Boiling water reactor uses the following as moderator, coolant and working fluid________________?
A. ordinary fluid
B. heavy water
C. molten lead
D. hydrogen gas
E. none of the above
Answer» B. heavy water
Discussion
24.

The nuclear power plant at Tarapur has the following reactor________________?
A. fast breeder
B. pressurised water
C. boiling water
D. sodium graphite
E. none of the above
Answer» D. sodium graphite
Discussion
25.

The number of isotopes of hydrogen are _________________?
A. 1
B. 2
C. U
D. 3
E. 0
Answer» E. 0
Discussion
26.

Ideally the neutron flux in reactor should be__________________ ?
A. maximum in center and zero at side
B. maximum at side and zero in center
C. uniform throughout
D. zero throughout
E. none of the above
Answer» D. zero throughout
Discussion
27.

U238 will undergo fission by_________________?
A. high energy (fast) neutrons alone
B. low energy (slow) neutrons alone
C. either fast or slow neutrons
D. medium energy neutrons
E. none of the above
Answer» B. low energy (slow) neutrons alone
Discussion
28.

A nuclear fission produces energy of following order in MeV___________________?
A. 20
B. 200
C. 2000
D. 20,000
E. 2 x 10⁵
Answer» C. 2000
Discussion
29.

Isotopes of same elements have___________________?
A. same atomic number and different masses
B. same chemical properties but different atomic numbers
C. different masses and different atomic numbers
D. different chemical properties and same atomic numbers
E. same chemical properties and same atomic numbers
Answer» C. different masses and different atomic numbers
Discussion
30.

The first unclear power plant in India is located at____________________?
A. Kota
B. Kalapakkam
C. Tarapur
D. Baraeilly
E. Kerala
Answer» D. Baraeilly
Discussion
31.

Moderator in nuclear plants is used to__________________?
A. reduce temperature
B. extract heat from nuclear reaction
C. control the reaction
D. cause collision with the fast moving neutrons to reduce their speed
E. moderate the radioactive pollution
Answer» E. moderate the radioactive pollution
Discussion
32.

The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
A. splitting
B. fission
C. fusion
D. disintegration
E. chain reaction
Answer» C. fusion
Discussion
33.

The mass number of a substance represents the sum of total number of___________________?
A. protons and neutrons in an atom
B. protons and electrons in an atom
C. neutrons and electrons in an atom
D. protons and neutrons in a nucleus
E. protons and electrons in a nucleus
Answer» E. protons and electrons in a nucleus
Discussion
34.

The fast breeder reactor uses the following moderator__________________?
A. demineralised water
B. carbon dioxide
C. heavy water
D. graphite
E. no moderator is used
Answer» F.
Discussion
35.

Which of the following are ferrite materials__________________?
A. U233andPu239
B. U
C. U238andPu239
D. U238andTh239
E. none of the above
Answer» C. U238andPu239
Discussion
36.

Amongst the following, the fissionable materials are________________?
A. U233andPu239
B. U23iandPu233
C. U235andPu235
D. U238andPu239
E. U243andPu235
Answer» B. U23iandPu233
Discussion
37.

The nuclear energy is measured as__________________?
A. MeV
B. curie
C. farads
D. MW
E. kWhr
Answer» B. curie
Discussion
38.

The main interest of shielding in nuclear reactor is protection against_______________?
A. X-rays
B. infra-red rays
C. a, P, and y rays
D. neutrons and gamma rays
E. electrons
Answer» E. electrons
Discussion
39.

Enriched uranium is one in which__________________?
A. %age of U235 has been artificially in-creased
B. %age of U has been artificially increased
C. %age of U234 has been artificially in-creased
D. extra energy is pumped from outside
E. all impurities have been removed
Answer» B. %age of U has been artificially increased
Discussion
40.

Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
A. gas cooled
B. liquid metal cooled
C. pressurised water
D. boiling water
E. none of the above
Answer» E. none of the above
Discussion
41.

Which of the following is the heaviest________________?
A. neutron
B. proton
C. atom
D. electron
E. nucleus
Answer» D. electron
Discussion
42.

The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?
A. same
B. lower
C. higher
D. unity
E. higher/lower depending on the size of reactor
Answer» C. higher
Discussion
43.

A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
A. same
B. more
C. less
D. there is no such criterion
E. none of the above
Answer» C. less
Discussion
44.

In fast breeder reactors___________________?
A. any type of moderator can be used
B. graphite is used as the moderator
C. heavy water is used as the moderator
D. moderator may or may not be used
E. moderator is dispensed with
Answer» F.
Discussion
45.

In nuclear fission each neutron that causes fission releases_______________?
A. no new neutron
B. at least one new neutron
C. one new neutron
D. more than one new neutrons
E. many-fold neutrons
Answer» E. many-fold neutrons
Discussion
46.

Gas cooled reactor uses following materials as moderator, and coolant____________________?
A. graphite, C02
B. graphite, air
C. heavy water, C02
D. lead, H2
E. concrete, N2
Answer» B. graphite, air
Discussion
47.

Ferrite material is____________________?
A. the most fissionable material
B. the basic fuel for nuclear paints
C. basic raw material for nuclear plants
D. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
E. none of the above
Answer» E. none of the above
Discussion
48.

Which of the following particles is the lightest__________________?
A. nucleus
B. electron
C. proton
D. meson
E. neutron
Answer» C. proton
Discussion
49.

U235 will undergo fission by__________________?
A. high energy (fast) neutrons alone
B. low energy (slow) neutrons alone
C. either fast or slow neutrons
D. medium energy neutrons
E. none of the above
Answer» D. medium energy neutrons
Discussion
50.

Fast breeder reactor uses___________________?
A. boiler
B. direct cycle of coolant system
C. double circuit system of coolant cycle
D. multi pass system
E. single circuit system
Answer» D. multi pass system
Discussion