551. The center of percussion of the homogeneous rod of length L suspended at the top will be___________________?
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A. 3L/4

B. 2L/3

C. L/3

D. L/2

E. 3L/8

552. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
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A. slant down towards direction of pull

B. unpredictable

C. none of the above

D. remain horizontal

E. slant up towards direction of pull

553. Which of the following is more appropriate for a moderator. One which_________________?
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A. accelerates neutrons

B. absorbs neutrons

C. does not absorb neutrons

D. eats up neutrons

E. regenerates neutrons

554. One ton refrigeratiqn corresponds to_________________?
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A. 80 kcal/min

B. 1000 kcal/day

C. 50 kcal/kr

D. 50 kcal/min

E. 80 kcal/hr

555. Thermal diffusivity of a substance is ____________________?
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A. none of the above

B. proportional to (k)

C. proportional of thermal conductivity

D. inversely proportional to k

E. inversely proportional to k2

556. A refrigerant should have _____________________?
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A. higher critical temperature

B. high boiling point

C. Tow specific heat of liquid

D. low specific volume of vapour

E. high latent heat of vaporisation

F. k up the wrong statement ?

557. The possible loading in various members of framed structures are_________________?
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A. buckling or shear

B. bending

C. shear or tension

D. all of the above

E. compression or tension
558. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________?
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A. lower temperature and pressure condi-tions

B. high heat rejection in condenser

C. high initial cost

D. nuclear hazard risk

E. higher cost of nuclear fuel

559. In boiling water reactor, moderator is__________________?
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A. liquid sodium metal

B. graphite rod

C. ferrite rod

D. blanket of thorium

E. coolant itself
560. Pick up the false statement ?
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A. exhaust losses in gas turbine are high due to large mass flow rate

B. gas turbine does not require huge quantity of water like steam plant

C. gas turbine can be easily started and stopped and thus is best suited for peaking demands

D. gas turbine is a self-starting unit

E. overall efficiency of gas turbine plant is lower than that of a reciprocating engine

561. Which is the correct statement about law of polygon of forces ?
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A. none of the above.

B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

C. if any number of forces acting at a point can be represented by the sides

D. a polygon taken in order, then the forces are in equilibrium

E. if a polygon representing forces acting at a point is closed then forces are in equilibrium

F. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

562. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if____________________?
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A. the floor is smooth, the wall is rough

B. the floor is rough, the wall is smooth

C. the floor and wall both are smooth surfaces

D. the floor and wall both are rough surfaces

E. will be in equilibrium under all conditions

563. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?
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A. conduction

B. conduction and convection

C. convection and radiation

D. radiation

E. convection

564. Thermal diffusivity is ____________________?
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A. function of temperature

B. used as mathematical model

C. a dimensionless parameter

D. useful in case of heat transfer by radiation

E. a physical property of the material
565. A refrigeration cycle operates between condenser temperature of + 27C and evaporator temperature of- 23C. The Cannot coefficient of performance of cycle will be_________________?
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A. 1.2

B. 0.2

C. 6

D. 5

E. 10

566. The impact strength of a material is an index of its ___________________?
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A. capability of being cold worked

B. toughness

C. fatigue strength

D. hardness

E. tensile strength

567. The value of modulus of elasticity for mild steel is of the order of________________?
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A. 2.1 x 107 kg/cm2

B. 2.1 X 106 kg/cm2

C. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2

D. 2.1xl05 kg/cm2

568. A universal joint is an example of_____________________?
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A. rolling pair

B. sliding pair

C. higher pair

D. lower pair

E. turning pair

569. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?
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A. low pressure side near receiver

B. suction of compressor

C. delivery of compressor

D. high pressure side close to receiver

E. anywhere in the cycle

570. The total strain energy stored in a body is termed as__________________?
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A. resilience

B. impact energy

C. toughness

D. modulus of resilience

E. proof resilience

571. A foot step bearing and rotor of a vertical turbine form examples of___________________?
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A. partially constrained motion

B. completely constrained motion

C. incompletely constrained motion

D. successfully constrained motion

E. none of the above

572. Cross head and guides form a _________________?
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A. higher pair

B. turning pair

C. lower pair

D. rolling pair

E. sliding pair
573. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________?
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A. maximum and minimum

B. zero and minimum

C. zero and maximum

D. maximum and zero

E. minimum and maximum

574. If a part is constrained to move and heated, it will develop ____________________?
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A. shear stress

B. compressive stress

C. tensile stress

D. principal stress

E. no stress

575. T Jie horse power transmitted by a belt is dependent upon _________________?
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A. speed of pulley

B. tension on slack side of belt

C. radius of pulley

D. tension on tight side of belt

E. all of the above
576. Flow stress corresponds to___________________?
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A. none of the above

B. breaking point

C. fluids in motion

D. rupture stress

E. plastic deformation of solids
577. The purpose of a link is to________________?
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A. guide other links

B. all of the above

C. none of the above

D. act as a support

E. transmit motion

578. In elliptical trammels_________________?
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A. two pairs turning and two pairs sliding

B. one pair turning and three pairs sliding

C. all four pairs sliding

D. all four pairs are turning

E. three pairs turning and one pair sliding

579. 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/2

B. h/4

C. h/6

D. 3/i/5

E. J/3

580. Formation of frost on evaporator in refrigerator ________________?
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A. results in loss of heat due to poor heat transfer

B. can be avoided by proper design

C. decreases compressor power

D. is immaterial

E. increases heat transfer rate

581. Poissons ratio is defined as the ratio of_________________?
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A. none of the above

B. lateral stress and longitudinal stress

C. longitudinal stress and longitudinal strain

D. longitudinal stress and lateral stress

E. lateral stress and lateral strain

582. To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use__________________?
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A. crown gear

B. spiral gear

C. bevel gear

D. spur gear

E. worm gear
583. Diamond riveted joint can be adopted in the case of following type of joint _____________________?
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A. butt joint

B. none of the above

C. all types of joints

D. double riveted lap joints

E. lap joint

584. The example of higher pair is_________________?
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A. none of the above

B. gears, cams

C. ball and roller bearings

D. all of the above

E. belt, rope and chain drives

585. Freon group of refrigerants are___________________?
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A. non-toxic and non-inflammable

B. inflammable

C. non-toxic and inflammable

D. non-inflammable and toxic

E. toxic

586. The co-efficient of friction depends upon _________________?
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A. shape of the surfaces

B. ail of the above.

C. A. and B. above

D. area of contact

E. nature of surfaces
587. A slider crank chain consists of following numbers of turning and sliding pairs_________________?
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A. 4, 0

B. I, 3

C. 2, 2

D. 3, 1

E. 0, 4

588. Vertical lines on pressure-enthalpy chart show constant_______________?
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A. entropy lines

B. temperature lines

C. total heat lines

D. pressure lines

E. volume lines

589. A cylindrical section having no joint is known as ____________________?
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A. perfect section

B. manufactured section

C. seamless section

D. jointless section

E. homogeneous section

590. If n = number of members andy = number of joints, then for a perfect frame, n =________________?
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A. 2j-l

B. j-2

C. 2/-3

D. 3/-2

E. 2/ -4

591. A material capable of absorbing large amount of energy before fracture is known as________________?
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A. plasticity

B. ductility

C. toughness

D. shock proof

E. resilience

592. If a heat pump cycle operates between the condenser temperature of +27C and evaporator temperature of 23C, then the Carnot COP will be_________________?
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A. 5

B. 1.2

C. 0.2

D. 10

E. 6
593. A mechanism is an assemblage of ____________________?
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A. three links

B. two links

C. none of the above

D. all of the above

E. four links or more than four links
594. The energy absorbed in a body, when it is strained within the elastic limits, is known as________________?
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A. toughness

B. strain energy

C. modulus of resilience

D. resilience

E. proof resilience

595. The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?
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A. same

B. less

C. more

D. more or less depending on other factors

E. unpredictable

596. Which of the following mechanism is obtained from lower pair________________?
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A. generated straight line motions

B. gyroscope

C. valve and valve gears

D. pantograph

E. all of the above
597. The materials having same elastic properties in all directions are called________________?
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A. paractical materials

B. elastic materials

C. isotropic materials

D. uniform materials

E. ideal materials

598. Shaft revolving in a bearing is the following type of pair________________?
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A. cylindrical pair

B. bearing pair

C. lower pair

D. spherical pair,

E. higher pair

599. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is________________?
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A. four times

B. half

C. double

D. same

E. one fourth

600. Dynamic friction as compared to static friction is __________________?
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A. has no correlation

B. same

C. less

D. more

E. may be less of more depending on nature of surfaces and velocity