← MES Jr. Grade
Past Questions — 2012
An activity in network analysis is represented by
A)
circle
B)
square
C)
straight line
D)
curved line
In network analysis, an activity is represented by a straight line (also called an arrow) connecting two events. The line shows the direction and duration of the activity. Circles usually represent events/nodes, not activities. Squares and curved lines are not the standard representation of an activity.
The number of atoms per unit cell in body centred cube (BCC) is
A)
1
B)
2
C)
3
D)
4
In a body-centred cubic (BCC) unit cell, 8 corner atoms each contribute 1/8 atom to the cell, giving 1 atom total from corners. The atom at the body centre contributes 1 full atom. So, total atoms per unit cell = 1 + 1 = 2. Hence, option (b) is correct. Options (a), (c), and (d) are incorrect because they do not match the BCC unit cell atom count.
Vacancy arises in a crystal due to
A)
missing atoms
B)
presence of extra atoms
C)
presence of foreign particles
D)
none of these
A vacancy defect in a crystal is formed when one or more atoms are missing from their normal lattice positions. This creates an empty lattice site called a vacancy. Extra atoms would cause interstitial defects, and foreign particles would cause impurity defects, not vacancy defects.
The problem of line balancing is particularly important in
A)
product layout
B)
process layout
C)
combined layout
D)
matrix layout
Line balancing is mainly concerned with arranging work elements so that each workstation in a production line has nearly equal workload. This is especially important in a product layout, where machines and workstations are arranged according to the sequence of operations for a specific product. In process layout, jobs follow different routes, so line balancing is not the central issue. Combined and matrix layouts are not the standard context for line balancing.
The method of determining the worker’s performance on a job is
A)
relative values of a job
B)
merit rating
C)
machine worth method
D)
overall production value
Worker’s performance on a job is assessed by comparing the worker’s efficiency, skill, and output against a standard. This is called merit rating. The other options relate to job evaluation or production valuation, not individual worker performance.
Multiple activity chart is used to optimize
A)
idle time
B)
work distribution
C)
labour cost
D)
all of these
A multiple activity chart is a work-study tool used to analyze the activities of two or more resources simultaneously, such as men and machines. Its purpose is to reduce idle time, improve work distribution, and thereby lower labour cost through better utilization of resources. Hence, it optimizes all of these.
The packing of atoms in hexagonal closed packed lattice is
A)
maximum
B)
minimum
C)
moderate
D)
none of the above
In a hexagonal close packed (HCP) lattice, atoms are packed as closely as possible, giving the highest packing efficiency among common crystal structures. Therefore, the packing of atoms in HCP lattice is maximum. The other options are incorrect because HCP is not minimum or moderate packing.
Atomic packing factor for a body centred cube (BCC) is
A)
0.68
B)
0.52
C)
0.74
D)
none of these
For a body-centred cubic (BCC) structure, the atomic packing factor (APF) is about 0.68. This means 68% of the unit cell volume is occupied by atoms. The standard APF values are: SC = 0.52, BCC = 0.68, FCC/HCP = 0.74. Therefore, the correct option is (a) 0.68.
Ceramics are processed at
A)
low temperature
B)
medium temperature
C)
high temperature
D)
any temperature
Ceramics are generally manufactured by firing or sintering at very high temperatures. This high-temperature processing gives them hardness, strength, and thermal stability. Low or medium temperatures are not sufficient for proper ceramic formation, and 'any temperature' is incorrect.
An amorphous solid like glass can be characterized as
A)
a malleable solid
B)
a crystal like structure
C)
a good conductor
D)
a super cooled liquid
Amorphous solids like glass do not have a regular crystalline arrangement. They are often described as supercooled liquids because their molecular structure resembles a liquid frozen into a rigid state. Hence, option (d) is correct. Option (a) is incorrect because glass is brittle, not malleable. Option (b) is incorrect because glass is not crystal-like. Option (c) is incorrect because glass is generally a poor conductor.
The material which does not become hard with the application of heat and pressure and no chemical change occurs is categorized as
A)
thermoplastics
B)
thermoelastics
C)
composites
D)
thermosetting plastics
Thermoplastics soften on heating and harden on cooling without any chemical change, so they do not become permanently hard by heat and pressure. Thermosetting plastics, on the other hand, undergo chemical change on heating and become permanently hard. Composites are a different class of materials, and thermoelastics is not the correct standard category here.
Detailed work factor analysis under work study finds its wide application in
A)
electronic industry
B)
steel industry
C)
IT industry
D)
automobile industry
Work factor analysis is a motion study technique used to analyze manual work into basic motions and assign standard times. It is especially useful where jobs are repetitive, involve many short-cycle assembly operations, and require detailed motion-level study. This is why it finds wide application in the automobile industry. The other options are less suitable: electronic and steel industries use work study too, but the classic and widest application of detailed work factor analysis is in automobile manufacturing and assembly lines.
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.