問題一覧
1
Of the following material below, which of these is most widely use for die casting
zinc
2
In thick cylinders, the stress can be uniformly distributed over the thickness by the method of pre-stressing as
any of these
3
The most widely used plastic in the world is
polyvinyl chloride
4
Wrought iron contains a maximum of which of the following
0.01 % carbon
5
The ability of metal to withstand forces thus following a number of twist
shear strength
6
In a thick walled spherical vessel, the longitudinal stress is
remains constant throughout the thickness
7
Which of the following composites are dispersion strengthened composite
particulate composite
8
In a beam of rectangular cross section, the maximum shear stress when related to the average shear stress is
50 % higher
9
In a beam of circular cross section, the maximum shear stress when related to the average shear is
33 % higher
10
In the buckling load for a given material depends on
slenderness ratio, area of cross section and modulus of elasticity
11
Autofrettage is a method of
pre-stressing thick cylinders
12
The shape of cantilever for uniformly distributed load will be :
parabolic
13
Plastic are organic polymers of high molecular weight The main constituents of polymers are :
carbon and hydrogen
14
The capacity of material to absorb energy when deformed elastically and then to have this energy recovered upon unloading load
resilience
15
Plastic material is used for the components which requires characteristics as
low density, machinability and large plastic deformation
16
Inconel contains 80 % nickle and 14 % chromium. The other metal present in inconel is :
iron
17
Which of the following the trade name of polypropylene ?
styrene
18
Mechanical properties pf metal are improved in hot working due to which of the following?
refining of grains
19
A collumn with a maximum equivalent length has
one end fixed and other free
20
Which is the following is not a viscoelastic material?
metal
21
Jominy end quench test is carried out to determine
hardenability of steel
22
This alloy has a low creep rate, is age hardenable and non magnetic, resist oxidation and exhibits a high strength at elevated temperature
INCONEL X
23
Y-alloy is an alloy of aluminum and which of the following metals ?
copper
24
Which of the following hardness tests uses the principle of measurement of depth of indentation for obtaining the hardness values of the material being tested?
Rockwell
25
The stress at which extension of the material takes place more quickly as compared to the increase in load is called:
yeilding point of the material
26
An air hardening die steel with high carbon, high chromium content with several desirable tool steel properties, such qs abrasion resistance, high hardness as well asnon deforming characteristics
AISI D2
27
An extra hard casting alloy with good ductility, intermediate strength and hardness that is use ld for pumps, impeller and steam nozzles .
H MONEL
28
Plasticizer are added to plastics to :
increase flexibility of materials
29
If a material expands freely due to heating it will develop.
no stress
30
Monel contains mainly with traces of iron and manganese. The main alloying element of monel is
copper
31
Is also known as tube mills and commonly used for wet grinding.
agitator ball mills
32
A low alloy tool steel which is hardened in oil and exhibits only a low tendency to shrinking or harping.
AISI H01
33
The high alloyed hot work tool steel, containing chromium, tungsten, colbat and vanadium, has excellent resistance to abrasion and shocks at elevated temperature
AISI H19