← MES Jr. Grade
Past Questions — 2012
An allotropic material should have
A)
fixed structure at all temperature
B)
different structures at different temperature
C)
atoms distributed in random patterns
D)
none of the above
Allotropy is the property of an element to exist in two or more different structural forms in the same physical state, often depending on temperature or pressure. So an allotropic material should have different structures at different temperatures. Option (a) is wrong because a fixed structure at all temperatures is not allotropy. Option (c) describes an amorphous/random arrangement, not allotropy. Hence, (b) is correct.
The basic drive systems usually used in commercially available robots is
A)
hydraulic
B)
electric motor
C)
pneumatic
D)
all the above
Commercially available robots usually use electric motors as the basic drive system because they are compact, efficient, easy to control, and suitable for precise motion. Hydraulic drives are used mainly where very high force is needed, and pneumatic drives are simpler but less precise. Therefore, the correct answer is electric motor.
The process of reducing the ore with carbon in the presence of a flux is called
A)
annealing
B)
smelting
C)
carbonation
D)
hardening
Smelting is the process of extracting a metal from its ore by heating and reducing it with carbon, usually in the presence of a flux to remove impurities as slag. Annealing and hardening are heat-treatment processes for metals, while carbonation is unrelated to ore reduction.
Ply wood is an example of
A)
layered composite
B)
fibre reinforced composite
C)
ceramic bonded with metal
D)
none of these
Plywood is made by bonding thin wood veneers in layers, usually with adjacent layers having grains at right angles. This makes it a laminated or layered composite material. It is not a fibre-reinforced composite, and it has nothing to do with ceramic-metal bonding. Therefore, the correct answer is layered composite.
The bond formed by sharing of atoms is called
A)
covalent bond
B)
ionic bond
C)
metallic bond
D)
coordinate bond
A bond formed by sharing of electrons between atoms is called a covalent bond. Ionic bond involves transfer of electrons, metallic bond is the bonding in metals, and coordinate bond is a special type of covalent bond where both shared electrons come from one atom.
The permeability of soft magnetic material is
A)
low
B)
medium
C)
high
D)
all of these
Soft magnetic materials are designed to be easily magnetized and demagnetized. This means they have low coercivity and high permeability. Therefore, the permeability of a soft magnetic material is high. Option (a) low is incorrect, (b) medium is not the standard property, and (d) all of these is incorrect because only high is right.
The use of material requirement planning (MRP) based system to plan all the resources of a manufacturing company is called
A)
MRP- I
B)
MRP- II
C)
MRP-III
D)
none of these
Material Requirement Planning (MRP) is used for planning materials only. When the MRP concept is extended to plan all the resources of a manufacturing company, including materials, capacity, manpower, and other production resources, it is called Manufacturing Resource Planning (MRP-II). Therefore, the correct answer is MRP-II. MRP-I refers only to material planning, while MRP-III is not the standard term used for this concept.
A high carbon steel contains
A)
0.8 – 1.5% of carbon
B)
0.2 – 0.7% of carbon
C)
1.6 – 2.0% of carbon
D)
None of the above
High carbon steel generally contains about 0.8% to 1.5% carbon. Low carbon steel has less than about 0.25% carbon, and medium carbon steel is roughly 0.25% to 0.7% carbon. Therefore, option (a) is correct.
The chart which is helpful in scheduling, dispatching and control is
A)
bar chart
B)
Gantt chart
C)
activity chart
D)
process chart
A Gantt chart is specifically used in production planning and control for scheduling, dispatching, and monitoring progress of work. It shows activities against time, making it easy to assign jobs and track completion. A bar chart is a general graphical representation, an activity chart is broader and less specific for shop-floor control, and a process chart is used to analyze the sequence of operations rather than scheduling and dispatching.
At or above Curie temperature a ferromagnetic material behaves like a
A)
diamagnetic material
B)
paramagnetic material
C)
ferri magnetic material
D)
anti ferro magnetic materials
A ferromagnetic material loses its spontaneous magnetization at or above the Curie temperature. Above this temperature, thermal agitation randomizes the magnetic domains, so the material no longer shows ferromagnetism and behaves like a paramagnetic material. Hence, option (b) is correct. Diamagnetic, ferrimagnetic, and antiferromagnetic behaviors are not the standard behavior of a ferromagnet above Curie temperature.
When low carbon steel is heated up to upper critical temperature
A)
the grain size does not change
B)
the grain size increases rapidly
C)
the grain size increases slowly
D)
none of the above
In low carbon steel, heating up to the upper critical temperature causes austenite formation. As the temperature approaches and exceeds this point, grain growth becomes rapid. Therefore, the grain size increases rapidly. Option (a) is incorrect because grain size does change, and option (c) is incorrect because the increase is not slow at this stage.
Composites are mainly used in
A)
automobile industry
B)
marine engineering
C)
aeronautical engineering
D)
all of these
Composite materials are widely used in automobile, marine, and aeronautical engineering because they offer high strength-to-weight ratio, corrosion resistance, and design flexibility. In automobiles they reduce weight and improve fuel efficiency; in marine applications they resist corrosion and water damage; and in aeronautics they are especially valuable for lightweight, high-strength structures. Hence, the correct answer is 'all of these'.
The property of the material which enables it to retain the deformation permanently is called
A)
brittleness
B)
ductility
C)
malleability
D)
plasticity
Plasticity is the property of a material by which it undergoes permanent deformation and retains the deformed shape after the load is removed. Brittleness means breaking without much deformation, ductility is the ability to be drawn into wires, and malleability is the ability to be hammered into thin sheets.
The type of production system suitable for zero inventories is named as
A)
CIM
B)
FMS
C)
CANBAN
D)
JIT
Zero inventories are the goal of Just-In-Time (JIT) production, where materials are supplied only when needed, minimizing or eliminating stock. CIM (Computer Integrated Manufacturing) is a broader automation concept, FMS (Flexible Manufacturing System) focuses on flexibility, and Kanban is a scheduling/control tool used within JIT, not the production system itself.
The chart which gives an estimate about the amount of material handling between various work stations is known as
A)
flow chart
B)
process chart
C)
travel chart
D)
bar chart
A travel chart shows the amount of material handling or movement between different work stations. It is used in plant layout to analyze inter-departmental flow and minimize unnecessary movement. A flow chart and process chart describe the sequence of operations, while a bar chart is a general graphical representation and not specific to material handling between stations.
Which one of the following control charts does not fall under attribute category?
A)
X-chart
B)
p-chart
C)
c-chart
D)
np-chart
Control charts are broadly classified into two categories: variable charts and attribute charts. X-chart (or X-bar chart) is used for variables data, such as measurements of length, weight, or diameter. In contrast, p-chart, c-chart, and np-chart are attribute charts used for defectives or defects. Therefore, X-chart does not fall under the attribute category.
Manganese bronze has
A)
high elasticity and wearing qualities
B)
high yield point
C)
high resistance to corrosion
D)
good cold working property
Manganese bronze is a strong copper alloy known for its high tensile strength, elasticity, and excellent wear resistance. It is commonly used for parts like gears, propellers, and bearings where these properties are needed. Option (b) is more generally associated with spring steels, (c) is true for many bronzes but is not the defining property asked here, and (d) is not correct because manganese bronze is not especially noted for cold working.
Boro silicate glass has good resistance to
A)
heat
B)
chemicals
C)
both heat and chemicals
D)
none of these
Borosilicate glass contains boron oxide, which gives it a low coefficient of thermal expansion and high thermal shock resistance, so it withstands heat well. It is also more resistant to chemical attack than ordinary soda-lime glass. Therefore, the correct answer is both heat and chemicals.
The ratio between measure of output and measure of input may be termed as
A)
profitability
B)
usability
C)
price index
D)
productivity
Productivity is defined as the ratio of output to input. It measures how efficiently resources are used to produce goods or services. The other options do not represent this ratio: profitability relates to profit earned, usability refers to ease of use, and price index measures changes in prices over time.
Which one of the following is not an example of joint sector?
A)
private entrepreneurs
B)
joint stock companies
C)
private limited company
D)
public limited company
A joint sector enterprise is one in which both the government and private sector participate, usually through a company form such as a joint stock company, private limited company, or public limited company. 'Private entrepreneurs' by themselves represent only the private sector and do not indicate joint participation by the government. Hence, they are not an example of joint sector.
In order to achieve part interchangeability, the type of layout suggested is
A)
product layout
B)
process layout
C)
combined layout
D)
matrix layout
Part interchangeability is best achieved when identical products are made in a fixed sequence with standardized operations and close control of dimensions. This is the feature of a product layout (also called line layout). In a product layout, machines are arranged according to the sequence of operations, which helps maintain uniformity and interchangeability of parts. A process layout groups similar machines together and is more flexible, so it is less suitable for interchangeability. Combined layout and matrix layout are not the standard layouts used for this purpose.
The iron that exists between 910ºC and 1405ºC is termed as
A)
α-iron
B)
β-iron
C)
γ-iron
D)
δ-iron
Iron exists in different allotropic forms at different temperature ranges. Between about 910°C and 1405°C, iron is in the gamma form, called γ-iron or austenite. α-iron exists below 910°C, and δ-iron exists above about 1405°C up to the melting point. Therefore, the correct answer is γ-iron.
The materials with ionic bond have
A)
high melting point
B)
moderate melting point
C)
low melting point
D)
none of these
Ionic compounds are held together by strong electrostatic attraction between oppositely charged ions. A large amount of energy is needed to break these bonds, so they generally have a high melting point. Hence, option (a) is correct. Options (b) and (c) are incorrect because ionic bonding is much stronger than in materials with moderate or low melting points.
Temperature at which solid glass changes to liquid glass is
A)
softening temperature
B)
transition temperature
C)
critical temperature
D)
none of the above
In glass technology, the temperature at which solid glass begins to behave like a liquid and changes from a rigid state to a plastic/liquid state is called the transition temperature.
- Softening temperature: the temperature at which glass starts to soften under its own weight, but this is not the standard term for the solid-to-liquid change.
- Critical temperature: not the correct term in glass materials context.
- Therefore, the correct answer is transition temperature.
Delta-iron occurs between the temperature ranges of
A)
400ºC to 600ºC
B)
600ºC to 900ºC
C)
900ºC to 1400ºC
D)
1400ºC to 1600ºC
Delta-iron (δ-iron) is the high-temperature body-centered cubic form of iron. It exists just below the melting point of iron, approximately from 1394°C to 1538°C. Among the given options, the closest and correct range is 1400ºC to 1600ºC. The other ranges correspond to lower-temperature forms of iron or are too low for δ-iron.