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Placement Materials & Answers-Free Download
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26.Ball bearings are not generally used in crank shafts of automobiles because
a)of high cost b)of high speed c)cannot be assembled d)none
27.Bronze is used in journal bearings essential to
a)reduce friction b)reduce heat c)eliminate oxidization d)eliminate seizing
28.The spindle of high precision cylindrical grinder is mounted on
a)Ball bearing b)Taper roller bearing c)Hydrostatic bronze bearing d)needle bearing
29.To accelerate the flow of gases
a)nozzle is used b)diffuser is used c)dia of pipe to increased d)none of these will help
a)acts as an accumulator b)acts as a storage for hydraulic energy c)acts as a pressure relief d)none arrangement.
31.When ice which is floating in water, melts, does the level to water
a)go up b)go down c)remain the same.
32.Hammer blow in pipe happens due to
a)friction in pipes b)change in temperature c)stoppage of flow d)none
33.Temperature rise in fluid flow causes
a)reduction in viscosity b)increase in viscosity c)no effect
34.Ratio between velocity of sound and velocity of any object is
a)prandtl number b)Reynolds number c)avagadro’s number d)mach number
35.Cavitaion effect in flow occurs due to
a)excess pressure b)excess temperature c)excess flow d)none
36.In electrical locomotives ultimate transmission is by
a)AC Motor b)DC Shunt Motor c)DC Series Motor d)Synchronous motor
37.Four beams of identical sections and lengths are made of cast iron, aluminium,steel and hardened steel. The beams are fixed at both ends; for a uniformly distributed load which will deflect least
a)cast iron b)aluminium c)steel d)hardened steel
38.Geneva mechanism is used for obtaining
a)Intermittent motion b)accelerating motion c)continuous motion d)none
39.Corioles component is associated with
a)Displacement b)acceleration c)velocity d)none
40.Effect of increase of outside diameter of a helical compression spring on its rigidity is
a)increased rigidity b)decreased rigidity c)no effect d)dry friction
41.Jominey curve is related to the study of
a)hydraulics b)thermodynamics c)electrical d)none
42.TTT diagram is used in
a)surface finish b)heat treatment c)stress analysis d)thermodynamics
43.Mehanite is the name given to a type of
a)alloy steel b)granite c)nodular cast iron d)cast iron
44.Unwanted impurity in molten aluminium is
a)oxygen b)carbon dioxide c)nitrogen d)hydrogen
45.Hardness in steel is a s a result of
a)martensitic structure b)pearlitic structure c)leduburetic structure d)austenitic structure
46.Carburising is done
a)for blackening of high carbon steel b)for case hardening of low carbon steel c)for post hardening d)to increase machinablility process to reduce of high tensile steels internal stresses
47.piston of an IC engine is made out of
a)cast iron b)steel casting c)beryllium alloy d)aluminium alloy
48.The crank shaft of a 300 HP IC engine is
a)hot forged b)shell moulded c)cold forged d)obtained through investment casting
A 6kg ball is suspended from two wires of equal length. The angle between the wires is 90 degrees. What is the tension in each wire?
a 523 kg experimental rocked sted can be accelerated from rest to 1602 km/h in 1.82s. what net force is required?
a force that averages 984N is applied to a 0.42kg steel ball moving at 13.8 m/s by a collision that lasts 0.027s. if the force is in a direction opposite to the initial velocity of the ball, what is the final speed of the ball?
a stone initially at rest is dropped over the edge of a very tall building. Taking g as 10m/s2 , what was the change in the speed of the stone building during the 4th second?
how long will it take a 2000w motor to lift a 320kg container vertically upwards for 26m?(g = 9.8m/s2)
a collision between two isolated items will in generally conserve
the total kinetic energy and the total momentum of the system
the total kinetic energy but not the total momentum of the system
the total momentum but not the total kinetic energy of the system
the momentum of each object
what is the force exerted on a submarine window of 2m2 area, if the submarine is at a depth of 2km below the surface?(the density of sea water is 1.03X103 kg/m3)
how many of the following statements are true:
the buoyant force on a body depends on the shape of the body
the buoyant force on a body always acts in the same direction
the buoyant force on a body depends on the mass of the body
the buoyant force on a body depends on the density of the fluid surrounding the body
how many of the following statements may be false?
The pressure in a fluid depends on the density of the fluid
The forces due to pressure in a fluid act perpendicular to the surface of a body immersed in a fluid
The buoyant force experienced by a body immersed in a fluid depends on the density of the body
The buoyant force always acts vertically upwards on a body immersed in a fluid
A body partially floats with 2/3rds of its volume under the surface of a fluid. If the density of the fluid is X kg/m3, what is the density of the body?
3/2 X kg/m3
2/3 X kg/m3
14.7 X kg/m3
0.15 X kg/m3
how many atoms are present in a mole of CH4 ?(avagadro’s number = 6.023X1023 /mole)
a power station generates 500MW of power and exhausts 800MW as waste heat into the environment. What is the efficiency of the power station?
how long does it take a 350W coffeepot to boil of 0.7L of water initially at 1000c. the latent heat of vapourisation of water = 2.1X106 J/kg.
a 16 ohm resistor and 8 ohm resistor are connected in series across a 12V battery. What is the voltage across each resistor respectively?
8V , 4V
4V , 8V
how many of the following statements regarding sound are true?
Intensity depends on the square root of the amplitude
Loudness only depends on the intensity of a sound
The pitch of a sound depends on the frequency
Sound is reflected whenever a change in acoustic impedance is encountered
How many of the following statements regarding light are true?
Light travels in a straight line even when it crosses between two media of different refractive index
Infrared light has longer wavelength than ultra-violet light
Light can behave both like a ray and like a particle
It is possible to get a real image with a concave lense
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