751. The property of a material by virtue of which a body returns to its original, shape after removal of the load is called____________________?
comments icon0

A. ductility

B. malleability

C. resilience

D. plasticity

E. elasticity
752. Where does the lowest temperature occur in a vapour compression cycle ?
comments icon0

A. compressor

B. receiver

C. expansion valve

D. condenser

E. evaporator
753. The maximum frictional force which comes into play when a body just begins to slide over another surface is called________________?
comments icon0

A. dynamic friction

B. kinematic friction

C. limiting friction

D. sliding friction

E. rolling friction

754. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?
comments icon0

A. none of the above

B. equally.

C. less

D. unpredictable

E. more
755. In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?
comments icon0
A. wet vapour

B. saturated liquid

C. liquid

D. sub-cooled liquid

E. dry vapour

756. The ratio of lateral strain to the linear strain within elastic limit is known as_______________?
comments icon0
A. Poissons ratio

B. bulk modulus

C. modulus of rigidity

D. modulus of elasticity

E. Youngs modulus

757. Creep in belt drive is due to____________________?
comments icon0

A. material of the pulley

B. expansion of belt

C. larger size of the driver pulley

D. material of the belt

E. uneven extensions and contractions due to varying tension
758. The advantage of dry compression is that________________?
comments icon0
A. all of the above

B. it permits complete evaporation in the evaporator

C. it results in high volumetirc and mechanical efficiency

D. none of the above

E. it permits higher speeds to be used

759. The refrigerant for a refrigerator should have ___________________?
comments icon0

A. high sensible heat

B. low sensible heat

C. low latent heat

D. high total heat

E. high latent heat
760. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella ________________________?
comments icon0

A. more inclined when standing

B. less inclined when moving

C. none of the above

D. more inclined when moving

E. less inclined when standing
761. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as______________________?
comments icon0
A. chain riveted joint

B. criss-cross riveted joint

C. zig-zag riveted joint

D. none of the above

E. diamond riveted joint

762. Idler pulley is used___________________?
comments icon0

A. none of the above

B. for changing the direction of motion of the belt

C. for applying tension

D. for increasing -velocity ratio

E. all of the above

763. Which of the following refrigerants has lowest freezing point_______________?
comments icon0
A. Freon-22

B. C02

C. NH3

D. S02

E. Freon-12

764. Flexible coupling is used because _____________________?
comments icon0

A. it increases shaft life

B. it is easy to engage and disengage

C. it is easy to disassemble

D. it transmits shocks gradually

E. it prevents shock transmission and eliminates stress reversals
765. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either___________________?
comments icon0

A. meet in a point

B. all the above are correct

C. be all parallel

D. none of the above

E. at least two of them must meet

766. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?
comments icon0

A. increase refrigeration effect

B. detect liquid in vapour

C. collect liquid refrigerant and prevent it from going to compressor

D. superheat the vapour

E. collect vapours

767. Which of the following is a lower pair_______________?
comments icon0
A. A. and B. above

B. piston and cylinder

C. ball and socket i

D. belt drive

E. cam and follower

768. For which material the Poissons ratio is more than unity_________________?
comments icon0

A. steel

B. aluminium

C. none of the above

D. cast iron

E. copper

769. The bank of tubes at the back of domestic refrigerator are _________________?
comments icon0

A. evaporator tubes

B. throttling device

C. condenser tubes

D. capillary tubes

E. refrigerant cooling tubes

770. Rivets are made of following type of material_________________?
comments icon0

A. malleable

B. resilient

C. ductile

D. tough

E. hard

771. Pitch point on a cam is_________________?
comments icon0

A. any point on pitch circle

B. the point on cam pitch curve having the minimum pressure angle

C. any point on pitch curve

D. none of the above

E. the point on cam pitch curve having the maximum pressure angle
772. Which is the false statement about true stress-strain method______________?
comments icon0
A. It does not exist

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives, a more accurate picture of the ductility

D. It can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.

E. It can be used for compression tests as well.

773. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?
comments icon0

A. 300 MN/m2

B. 30 MN/m2

C. 50 MN/m2

D. 200 MN/m2

E. 100 MN/m2
774. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to_________________?
comments icon0

A. 500

B. 250

C. 100

D. 50

E. 25

775. Elements of pairs held together mechanically is known as ___________________?
comments icon0
A. closed pair

B. rolling pair

C. none of the above

D. open pair

E. mechanical pair

776. The Ackermann steering mechanism is preferred to the Davis type in automobiles because____________________?
comments icon0
A. the former is having turning pair

B. the former is mathematically accurate

C. the former is most economical

D. none of thfr above

E. the former is most rigid

777. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the_________________?
comments icon0

A. smaller of the two

B. size of the drilled or reamed hole

C. size of rivet

D. average of size of rivet and hole

E. any one of the above

778. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?
comments icon0
A. less

B. more

C. may have any value

D. more/less depending on composition

E. same

779. Reducing suction pressure in refrigeration cycle_________________?
comments icon0

A. lowers compressor capacity because vapour is lighter

B. reduces weight displaced by piston

C. lowers evaporation temperature

D. all of the above

E. increases power required per ton of refrigeration

780. The number of links in pantograph mechanism is equal to______________?
comments icon0

A. 5

B. 2

C. 3

D. 6

E. 4
781. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?
comments icon0

A. 5 to 10 h.p. per ton refrigeration

B. 0.1 to 0.5 h.p. per ton of refrigeration

C. 1 to 2 h.p. per ton of refrigeration

D. 0.5 to 0.8 h.p. per ton of refrigeration

E. 2 to 5 h.p. per ton of refrigeration

782. In higher pair, the relative motion is_____________________?
comments icon0

A. purely surface contact

B. purely sliding

C. combination of sliding and turning

D. purely turning

E. purely rotary

783. In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?
comments icon0

A. more

B. less for small capacity and more for high capacity

C. less

D. same

E. more for small capacity and less for high capacity

784. Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?
comments icon0

A. 1:01

B. 3:01

C. 1 : 9

D. 9:01

E. 1:03

785. The higher temperature in vapour compression cycle occurs at____________________?
comments icon0

A. receiver

B. compressor discharge

C. expansion valve

D. evaporator

E. condenser discharge

786. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts_______________?
comments icon0
A. kinetics

B. mechanisms

C. kinematics

D. theory of machines

E. applied mechanics

787. The moment on the pulley which produces rotation is called ___________________?
comments icon0

A. momentum

B. work

C. inertia

D. moment of momentum

E. torque
788. Davis steering gear consists of__________________?
comments icon0

A. turning pairs

B. rolling pairs

C. higher pairs

D. lower pairs

E. sliding pairs
789. The C.G. of a solid hemisphere lies on the central radius 3r_________________?
comments icon0

A. at distance from the plane base

B. at distance from the plane base 3r

C. at distance from the plane base or

D. at distance from the plane base 3r

E. at distance from the plane base 3r

790. Any point on a link connecting double slider crank chain will trace a ________________?
comments icon0

A. hyperbola

B. ellipse

C. straight line

D. parabola

E. circle

791. Longitudinal stress in a thin cylinder is__________________?
comments icon0

A. equal to the hoop stress

B. one-fourth of hoop stress

C. four times the hoop stress

D. half of the hoop stress

E. twice the hoop stress

792. The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will__________________?
comments icon0

A. remain unaffected

B. decrease

C. may increase or decrease depending on the type of refrigerant used

D. increase

E. unpredictable

793. Modulus of rigidity is defined as the ratio of_________________?
comments icon0
A. shear stress and shear strain

B. volumetric stress and volumetric strain

C. lateral stress and lateral strain

D. linear stress and lateral strain

E. longitudinal stress and longitudinal strain

794. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be _________________?
comments icon0

A. 01:02.5

B. 1:04

C. 1 : 3

D. 01:02.2

E. 1:02

795. The coefficient of performance is the ratio of the refrigerant effect to the_________________?
comments icon0
A. all of the above

B. none of the above

C. work done by compressor

D. enthalpy increase in compressor

E. heat of compression

796. Highest temperature encountered in refrigeration cycle should be________________?
comments icon0

A. above critical temperature

B. at critica. temperature

C. near critical temperature of refrigerant

D. much below critical temperature

E. could be anywhere

797. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to___________________?
comments icon0

A. Poissons ratio

B. bulk modulus

C. Youngs modulus

D. modulus of rigidity

E. modulus of elasticity

798. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called_____________?
comments icon0
A. creeping

B. breaking

C. none of the above

D. yielding

E. plasticity

799. The property of a material by virtue of which it can be beaten or rolled into plates is called _________________?
comments icon0

A. reliability

B. elasticity

C. malleability

D. ductility

E. plasticity

800. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as__________________?
comments icon0
A. turning pair

B. spherical pair

C. rolling pair

D. sliding pair

E. lower pair