WorksheetsPPE IAT-II
Total questions: 50
Worksheet time: 25mins
The reference fuels for knock rating of spark ignition engines would include __________
normal octane and aniline
iso-octane and normal hexane
iso-octane and alpha-methyl naphthalene
normal heptane and iso-octane
What is the purpose of testing an internal combustion engine?
to conform the data used in design, the validity of which may be doubtful
to satisfy the customer regarding the performance of the engine
to determine the information, which cannot be obtained by calculations
all of the mentioned
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
overheated spark plug points
red hot carbon deposits on cylinder walls
cylinder walls being too hot
any of the mentioned
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be __________
20%
25%
50%
60%
A diesel engine is __________ as compared to petrol engine, both running at rated load.
equally efficient
more efficient
less efficient
all of the mentioned
A higher compression ratio causes __________
increase in detonation
pre-ignition
an acceleration in the rate of combustion
any one of the mentioned
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
inlet valve closing before bottom dead centre
inlet valve closing after bottom dead centre
inlet valve opening before top dead centre
exhaust valve closing after top dead centre
The installation time for a gas turbine power plant is ______________
Comparatively less than thermal power plant
Comparatively more than thermal power plant
Equal to thermal power plant
Very much longer than thermal power plant
Which of the following is not used in gas turbine power plant?
Compressor
Turbine
Combustion chamber
Condenser
Which component of gas turbine power plant is main cause of its low efficiency?
Gas turbine
Combustion chamber
Compressor
Starting motor
What is intercooling in gas turbine power plant?
Removal of heat from combustion gas between stages of turbine
Removal of heat from compressor between stages of compressor
Removal of heat from intake air
Removal of heat from exhaust air
Fuel other than natural gas i.e. solid and liquid fuels can be used in _______
open cycle gas turbine power plant
closed cycle gas turbine power plant
open and closed cycle gas turbine power plant
only natural gas is used in gas turbine power plant
Gas and Steam turbine combined power plant produces more electricity than traditional power plants by how much percent?
25
40
50
The given statement was false
Turbines that are run by exhaust gases are called _______
power recovery turbines
stepped turbines
turbo compounded engine
none of the mentioned
What are turbo-compound engines?
Turbines run at exhausts of Otto and diesel cycles
Combination of turbofan and turbojet engines
Combination of turboprop and turbofan engines
None of the mentioned
The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is
same
more
may be less or mote depending on size
unpredictable
Isotopes of same elements have
same atomic number and different masses
same chemical properties but different atomic numbers
different masses and different atomic numbers
different chemical properties and same atomic
Atomic number of an element in the periodic table represents the numbers of
protons in the nucleus
neutrons in the nucleus
electrons in the atom
neutrons in the atom
The mass number of a substance represents the sum of total number of
protons and neutrons in an atom
protons and electrons in an atom
neutrons and electrons in an atom
protons and neutrons in a nucleus
Which is not identical for an atom and an isotope
mass number
atomic number
chemical properties
position in periodic table
Amongst the following, the fissionable materials are
U233andPu239
U23iandPu233
U235andPu235
U238andPu239
A nuclear unit becoming critical means
it is generating power to rated capacity
it is capable of generating much more than rated capacity
there is danger of nuclear spread
chain reaction that causes automatic splitting of the fuel nuclei has been established
Moderator in nuclear plants is used to
reduce temperature
extract heat from nuclear reaction
control the reaction
cause collision with the fast moving neutrons to reduce their speed
The most commonly used moderator in nuclear plants is
heavy water
concrete and bricks
graphite and concrete
graphite
The nuclear energy is measured as
MeV
curie
farads
MW
The total energy released in fission of U is
5 MeV
10 MeV
199 MeV
168 MeV
Breeder reactor has a conversion ratio of
unity
more than unity
less than unity
zero
Boiling water reactor employs
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
Fast breeder reactor uses
boiler
direct cycle of coolant system
double circuit system of coolant cycle
multi pass system
One gram of uranium will produce energy equivalent to approximately
1 tonne of high grade coal
4.5 tonnes of high grade coal
10 tonnes of high grade coal
100 tonnes of high grade coal
Which of the following nuclear reactor does not need a heat exchanger for generation of steam
gas cooled
liquid metal cooled
pressurised water
boiling water
The commonly used material for shielding is
lead or concrete
lead and tin
graphite or cadmium
thick galvanized sheets
The main interest of shielding in nuclear reactor is protection against
X-rays
infra-red rays
a, P, and y rays
neutrons and gamma rays
Reflector in nuclear plants is used to
return the neutrons back into the core
shield the radioactivity completely
check polllution
conserve energy
The energy required to be applied to a radioactive nucleus for the emission of a neutron is
1 MeV
2.4 MeV
4.3 MeV
7.8 MeV
Which of the following are ferrite materials
U233andPu239
U
U238andPu239
U238andTh239
Enriched uranium is one in which
%age of U235 has been artificially in-creased
%age of U has been artificially in¬creased
%age of U234 has been artificially in-creased
extra energy is pumped from outside
Which of the following particles is the lightest
nucleus
electron
proton
meson
Which of the following is the heaviest
neutron
proton
atom
electron
In fast breeder reactors
any type of moderator can be used
graphite is used as the moderator
moderator is dispensed with
moderator may or may not be used
In nuclear fission each neutron that causes fission releases
no new neutron
at least one new neutron
one new neutron
more than one new neutrons
The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
same
lower
higher
unity
Gas cooled reactor uses following materials as moderator, and coolant
graphite, C02
graphite, air
heavy water, C02
lead, H2
A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is
same
more
less
there is no such criterion
The fast breeder reactor uses the following moderator
demineralised water
carbon dioxide
heavy water
no moderator is used
The nuclear power plant at Tarapur has the following reactor
fast breeder
pressurised water
boiling water
sodium graphite
Boiling water reactor uses the following as moderator, coolant and working fluid
ordinary fluid
heavy water
molten lead
hydrogen gas
U235 will undergo fission by
high energy (fast) neutrons alone
low energy (slow) neutrons alone
either fast or slow neutrons
medium energy neutrons
A reactor capable of converting a ferrite material into fissile isotopes is called
regenerative reactor
fast breeder reactor
breeder reactor
boiling water reactor
Natural uranium is made up of
99.282% U238, 0.712% U235, 0.006% U234
99.282% U235, 0.712% U238, 0.06%’ U234
99.282% U234, 0.712% U238, 0.006% U235
99.282% U235, 0.712% U234, 0.006% U238
