401. Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?
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A. less thermal conductivity insulator

B. high thickness of insulation

C. all of the above

D. a vapour seal

E. high vapour pressure

402. In the breeder reactors the generation of new fissionable atom is_________________?
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A. unpredictable

B. at an equal rate of the consumption

C. at a higher rate than the constuption

D. at the lower rate than the consumption

E. depends on other considerations

403. If n = number of members andy = number of joints, then for a perfect frame, n =_________________?
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A. 2/-3

B. 3/-2

C. 2/ -4

D. j-2

E. 2j-l

404. The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
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A. absorptive power

B. emissive power

C. none of the above

D. absorptivity

E. emissivity

405. Plutonium-239 is produced__________________?
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A. by neutron irradiation of IT*

B. as basic raw material

C. artificially

D. by neutron irradiation of thorium

E. in high capacity furnaces

406. The unit of work or energy in S.I. units is_______________?
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A. newton

B. pascal

C. kilogram meter

D. joule

E. watt

407. Pick up the wrong statement Fast breeder reactors__________________?
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A. produce more fuel than they consume

B. use water as coolant

C. operate at extremely high power densities.

D. are unmoderated

E. are liquid-metal cooled

408. Unit of thermal diffusivity is_________________?
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A. m2/hrC

B. kcal/m2 hr

C. kcal/m.hrC

D. kcal/m2 hrC

E. m2/hr
409. The energy produced by a thermal reactor of same size as a breeder reactor is__________________?
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A. slightly more

B. almost same

C. slightly less

D. much more.

E. much less
410. Pick up the correct statement ?
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A. none of the above

B. all of the above

C. gas turhine uses high air-fuel ratio to reduce outgoing temperature

D. gas turbine uses low air-fuel ratio to economise on fuel

E. gas turbine uses low air-fuel ratio to develop the high thrust required

411. When a reactor becomes critical, then the production of neutrons is_________________?
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A. infinite

B. initiated

C. zero

D. exactly balanced by the loss of neutrons through leakage

E. stopped

412. The units of moment of inertia of an area are__________________?
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A. kg/m4

B. kg m2

C. m3

D. kg/m2

E. m4
413. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span___________________?
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A. 2.0 cm

B. 2.5 cm

C. 5.0 cm

D. 3.0 cm

E. 4.0 cm
414. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?
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A. may be higher or lower depending upon the nature of non-condensable gases

B. unpredictable

C. will be higher

D. will be lower

E. will remain unaffected

415. The C.G. of a right circular solid cone of height h lies at the following distance from the base______________?
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A. h/4

B. h/6

C. 3/i/5

D. J/3

E. h/2

416. If the temperature of a solid surface changes form 27C to 627C, then its emissive power changes in the ratio of___________________?
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A. 81

B. 27

C. 6

D. 3

E. 9

417. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?
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A. downwards at its upper end

B. upwards at its upper end

C. towards the wall at its upper end

D. away from the wall at its upper end

E. none of the above

418. Thermal conductivity of air with rise in temperature__________________?
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A. remains constant

B. may increase or decrease depending on temperature

C. none of the above

D. increases

E. decreases

419. The algebraic sum of moments of the forces forming couple about any point in their plane is_________________?
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A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

420. Sensible heat is the heat required to __________________?
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A. convert saturated steam into dry steam

B. increase the temperature of a liquid of vapour

C. change vapour into liquid

D. convert water into steam and superheat it

E. change liquid into vapour

421. Which of the following can be used as a coolant in nuclear plant________________?
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A. carbon tetrachloride

B. carbon dioxide

C. freon

D. molten lead

E. light or heavy water
422. When trying to turn a key into a lock, following is applied _____________________?
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A. moment

B. lever

C. coplanar force

D. couple

E. non-coplanar forces

423. The unit of overall coefficient of heat transfer is___________________?
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A. kcal/m3 hr C

B. kcal/m2

C. kcal/hr C

D. kcal/m2 hr C

E. kacl/m hr C

424. A force is completely defined when we specify_______________?
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A. all of the above

B. none of the above

C. direction

D. point of application

E. magnitude

425. Heat transfer by radiation mainly depends upon___________________?
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A. all of the above

B. its temperature

C. none of the above

D. nature of the body

E. kind and extent of its surface

426. Center of percussion is___________________?
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A. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

B. the point of C.G.

C. point of suspension

D. the point of metacentre

E. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity

427. A boiling water reactor uses following as fuel________________?
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A. U

B. plutonium

C. natural uranium.

D. enriched uranium

E. thorium

428. Choose the correct statement ________________?
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A. gas turbine is capable of rapid start up and loading

B. gas turbines have high standby losses and require lot of maintenance

C. gas turbine requires lot of cooling water

D. gas turbines have flat efficiency at part loads

E. gas turbines can be used to generate power only

429. The units of moment of inertia of mass are ________________?
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A. kg/m2

B. m2/kg

C. kg/m

D. m4

E. kg m2
430. Coefficient of friction is the_________________?
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A. angle between normal reaction and the resultant of normal reaction and the limiting friction

B. tangent of angle of repose

C. the friction force acting when the body is just about to move

D. the friction force acting when the body is in motion

E. ratio of limiting friction and normal reaction
431. In vapor compression cycle, the condition of refrigerant is high pressure saturated liquid________________?
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A. before entering the expansion valve

B. before passing through the condenser

C. before entering the compressor

D. after passing through the expansion or thiottle valve

E. after passing through the condenser

432. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?
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A. none of the above

B. upwards at its upper end

C. zero at its upper end

D. downwards at its upper end

E. perpendicular to the wall at its upper end

433. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?
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A. elliptical

B. hyperbola

C. circular arc

D. parabola

E. catenary

434. LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
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A. same

B. lower

C. depends on the area of heat exchanger

D. higher

E. depends on temperature conditions

435. Heat is closely related with___________________?
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A. entropy

B. energy

C. liquids

D. enthalpy

E. temperature
436. The maximum frictional force which comes into play when a body just begins to slide over another surface is called__________________?
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A. limiting friction

B. kinematic friction

C. rolling friction

D. dynamic friction

E. sliding friction

437. Supertheated steam is generated in following reactor________________?
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A. none of the above

B. all of the above

C. pressurised water

D. boiling water

E. gas cooled
438. Absorptivity of a body will be equal to its emissivity___________________?
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A. for a polished body

B. at critical temperature

C. when system is under thermal equi-librium

D. at one particular temperature

E. at all temperatures

439. According to Wiens law, the wavelength corresponding to maximum energy is proportion to ________________?
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A. t

B. 1/r

C. absolute temperature (T)

D. I2

E. f

440. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction___________________?
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A. unpredictable

B. vertically

C. at an angle equal to the angle of friction to the inclined plane

D. horizontally

E. along the plane

441. The thermal diffusivities for solids are generally__________________?
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A. zerci

B. jess than those for liquids

C. less than those for gases

D. more than those for liquids and gases

E. more or less same as for liquids and gases

442. Which of the following has maximum value of thermal conductivity________________?
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A. lead

B. steel

C. aluminium

D. copper

E. brass

443. The weight of a body is due to ___________________?
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A. gravitational pull exerted by the earth

B. gravitational force of attraction towards the center of the earth

C. centripetal force of earth

D. force of attraction experienced by particles

E. forces experienced by body in atmosphere

444. Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in _________________?
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A. boiler

B. electric heater

C. melting of ice

D. steam condenser

E. refrigerator condenser coils

445. Plancks law holds good for________________?
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A. none of the above

B. black bodies

C. all coloured bodies

D. all of the above

E. polished bodies

446. A cable with a uniformly distributed load per horizontal meter run will take the following shape________________?
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A. elliptical

B. straight line

C. parabola

D. part of a circle

E. hyperbola

447. In a fission process, maximum %age of energy is released as___________________?
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A. instantaneous release of gamma rays

B. kinetic energy of neutrons

C. none of the above

D. gradual readioactive decay of fission products

E. kinetic energy of fission products
448. The insulation ability of an insulator with the presence of moisture would_________________?
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A. may increase/decrease depending on temperature and thickness of insulation

B. remain unaffected

C. increase

D. decrease

E. none of the above

449. In the equation of virtual work, following force is neglected_______________________?
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A. reaction of any smooth surface with which the body is in contact

B. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

C. all of the above

D. reaction of a rough surface of a body which rolls on it without slipping

E. none of the above

450. In triggering fission, the following types of neutrons are desirable_________________?
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A. neutrons at rest

B. slow moving

C. none of the above

D. fast moving

E. critical neutrons