2451. The sense of Coriolis component is such that it_________________?
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A. leads the sliding velocity vector by 180

B. is along the sliding velocity vector

C. none of the above

D. lags the sliding velocity vector by 90

E. leads the sliding velocity vector by 90
2452. Higher pairs are those which have_________________?
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A. elements of pairs not held together mechanically

B. surface contact between the two ele-ments when in motion

C. point or line contact between the two elements when in motion

D. two elements that permit relative motion

E. none of the above

2453. Open pairs are those which have__________________?
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A. elements of pairs not held together mechanically

B. none of the above

C. surface contact between the two ele-ments when in motion

D. point or line contact between the two elements when in motion

E. two elements that permit relative motion

2454. In a shaper mechanism, the Coriolis component of acceleration will_______________?
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A. not exist

B. unpredictable

C. none of the above

D. depend on position of crank

E. exist
2455. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
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A. none of the above

B. less than sum of other two

C. greater than sum of other two

D. there is no such relationship

E. equal to sum of other two

2456. According to Kennedys theorem, if three bodies have plane motions, their instantaneous centers lie on___________________?
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A. a triangle

B. a point

C. a curve

D. a straight line

E. two lines

2457. Tangential acceleration direction is_________________?
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A. perpendicular to angular velocity

B. along the angular velocity

C. opposite to angular velocity

D. none of the above

E. may be any one of these
2458. In its simplest form, a cam mechanism consists of following number of links___________________?
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A. 4

B. 1

C. 3

D. none

E. 2

2459. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
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A. 45 mm

B. none of the above

C. slightly less than 95 mm

D. 95 mm

E. slightly more than 95 mm

2460. The number of centers in a crank driven slider crank mechanism are_______________?
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A. 6

B. 2

C. 4

D. may be any number depending upon position of mechanism

E. 0

2461. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links_________________?
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A. will remain same

B. could change or remain unaltered depending oh which link is fixed

C. will change

D. none of the above

E. will not occur

2462. The main disadvantage of the sliding pair is that it is_________________?
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A. A. and C. above

B. difficult to manufacture

C. wears rapidly

D. bulky

E. A. and B. above
2463. Coriolis component of acceleration exists whenever a point moves along a path that has________________?
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A. linear displacement

B. rotational motion

C. tangential acceleration

D. centripetal acceleration

E. none of the above

2464. Cylindrical cams can be classified as_________________?
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A. circular

B. tangent

C. all of the above

D. none of the above

E. reciprocating

2465. Kinematic pairs are those which have___________________?
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A. minimum of two instantaneous centres

B. two elements having Coroilis com-ponent

C. all of the above

D. two elements having relative motion

E. two elements held together mechani-cally

2466. Which is not identical for an atom and an isotope_________________?
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A. atomic number

B. all of the above

C. position in periodic table

D. chemical properties

E. mass number
2467. Reflector in nuclear plants is used to________________?
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A. conserve energy

B. is not used

C. return the neutrons back into the core

D. shield the radioactivity completely

E. check polllution

2468. Gas cooled reactor uses following materials as moderator, and coolant____________________?
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A. concrete, N2

B. heavy water, C02

C. graphite, C02

D. lead, H2

E. graphite, air

2469. Isotopes of same elements have___________________?
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A. same chemical properties but different atomic numbers

B. same chemical properties and same atomic numbers

C. same atomic number and different masses

D. different chemical properties and same atomic numbers

E. different masses and different atomic numbers

2470. Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
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A. is a good conductor

B. has high specific heat

C. is lighter

D. is inert

E. all of the above

2471. In nuclear fission each neutron that causes fission releases_______________?
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A. more than one new neutrons

B. no new neutron

C. one new neutron

D. many-fold neutrons

E. at least one new neutron

2472. Enriched uranium is one in which__________________?
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A. all impurities have been removed

B. extra energy is pumped from outside

C. %age of U235 has been artificially in-creased

D. %age of U has been artificially increased

E. %age of U234 has been artificially in-creased

2473. Which of the following particles is the lightest__________________?
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A. neutron

B. meson

C. proton

D. electron

E. nucleus

2474. Boiling water reactor employs__________________?
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A. double circuit system of coolant cycle

B. single circuit system

C. multi pass system

D. direct cycle of coolant system

E. boiler

2475. Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
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A. gas cooled

B. pressurised water

C. liquid metal cooled

D. none of the above

E. boiling water
2476. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is________________?
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A. more

B. same

C. may be less or mote depending on size

D. unpredictable

E. less
2477. The first unclear power plant in India is located at____________________?
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A. Kota

B. Tarapur

C. Baraeilly

D. Kalapakkam

E. Kerala

2478. The nuclear energy is measured as__________________?
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A. MW

B. MeV

C. curie

D. kWhr

E. farads

2479. Atomic number of an element in the periodic table represents the numbers of_________________?
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A. neutrons in the nucleus

B. electrons in the atom

C. protons in the nucleus

D. electrons in me nucleus

E. neutrons in the atom

2480. The total energy released in fission of U is__________________?
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A. 10 MeV

B. 199 MeV

C. 11 MeV

D. 168 MeV

E. 5 MeV

2481. The main interest of shielding in nuclear reactor is protection against_______________?
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A. neutrons and gamma rays

B. X-rays

C. infra-red rays

D. a, P, and y rays

E. electrons

2482. Fast breeder reactor uses___________________?
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A. single circuit system

B. boiler

C. direct cycle of coolant system

D. multi pass system

E. double circuit system of coolant cycle
2483. A nuclear unit becoming critical means_______________?
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A. it is capable of generating much more than rated capacity

B. it is generating power to rated capacity

C. chain reaction that causes automatic splitting of the fuel nuclei has been established

D. there is danger of nuclear spread

E. it generates no heat

2484. Ferrite material is____________________?
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A. the basic fuel for nuclear paints

B. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

C. basic raw material for nuclear plants

D. the most fissionable material

E. none of the above

2485. Boiling water reactor uses the following as moderator, coolant and working fluid________________?
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A. ordinary fluid

B. heavy water

C. hydrogen gas

D. molten lead

E. none of the above

2486. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
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A. chain reaction

B. disintegration

C. fusion

D. splitting

E. fission
2487. Amongst the following, the fissionable materials are________________?
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A. U233andPu239

B. U235andPu235

C. U23iandPu233

D. U243andPu235

E. U238andPu239

2488. The fast breeder reactor uses the following moderator__________________?
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A. graphite

B. carbon dioxide

C. demineralised water

D. no moderator is used

E. heavy water

2489. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
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A. there is no such criterion

B. none of the above

C. less

D. same

E. more
2490. In fast breeder reactors___________________?
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A. heavy water is used as the moderator

B. moderator may or may not be used

C. graphite is used as the moderator

D. any type of moderator can be used

E. moderator is dispensed with
2491. Breeder reactor has a conversion ratio of_____________________?
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A. less than unity

B. zero

C. infinity

D. unity

E. more than unity
2492. Which of the following is the heaviest________________?
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A. neutron

B. atom

C. electron

D. nucleus

E. proton

2493. The number of isotopes of hydrogen are _________________?
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A. 2

B. 3

C. 0

D. 1

E. U

2494. U238 will undergo fission by_________________?
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A. high energy (fast) neutrons alone

B. none of the above

C. medium energy neutrons

D. either fast or slow neutrons

E. low energy (slow) neutrons alone

2495. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?
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A. same

B. unity

C. lower

D. higher/lower depending on the size of reactor

E. higher

2496. One gram of uranium will produce energy equivalent to approximately____________________?
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A. 100 tonnes of high grade coal

B. 1000 tonnes of high grade coal

C. 1 tonne of high grade coal

D. 10 tonnes of high grade coal

E. 4.5 tonnes of high grade coal
2497. The most commonly used moderator in nuclear plants is___________________?
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A. deutrium

B. graphite

C. graphite and concrete

D. concrete and bricks

E. heavy water

2498. The mass number of a substance represents the sum of total number of___________________?
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A. protons and electrons in a nucleus

B. protons and neutrons in a nucleus

C. neutrons and electrons in an atom

D. protons and neutrons in an atom

E. protons and electrons in an atom

2499. The commonly used material for shielding is__________________?
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A. thick galvanised sheets

B. graphite or cadmium

C. lead or concrete

D. black carbon papers

E. lead and tin

2500. A nuclear fission produces energy of following order in MeV___________________?
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A. 20

B. 200

C. 20,000

D. 2000

E. 2 x 105