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Past Questions — 2016
The melting point of pure iron is
A)
1355°C
B)
1500°C
C)
1553°C
D)
1535°C
The melting point of pure iron is about 1538°C, and in standard exam references it is commonly given as 1535°C. So option (d) is correct. The other values are not the accepted melting point of pure iron.
Which are widely used length standards?
A)
Kilometre & furlong
B)
International standard metre & Imperical standard yard
C)
Centimetre & inch
D)
None of these
The widely used length standards in metrology are the international standard metre and the imperial standard yard. These have historically served as reference standards for metric and imperial systems, respectively. Option (a) lists units of length but not standard reference standards; option (c) gives common units, not standards. Hence, option (b) is correct.
A machine tool that removes metal as the work is fed against a rotating multipoint cutter is
A)
Grinding machine
B)
Boring machine
C)
Gear hobbing machine
D)
Milling machine
A milling machine removes metal by feeding the workpiece against a rotating multipoint cutter (the milling cutter). This is the defining feature of milling. A grinding machine uses an abrasive wheel, a boring machine enlarges existing holes with a single-point tool, and a gear hobbing machine is a specialized gear-cutting machine, not the general machine described here.
Flat belts and V-belts may be employed
A)
to transmit mechanical power from one shaft to electrical power
B)
to transmit power from one shaft to another where it is not necessary to maintain an exact speed ratio between the two shafts
C)
to stop the engine
D)
None of these
Flat belts and V-belts are used for power transmission between shafts. They are suitable where slight slip and creep can be tolerated, so an exact speed ratio is not essential. Option (a) is incorrect because belts do not transmit mechanical power to electrical power; that requires a generator or alternator. Option (c) is incorrect because stopping an engine is the function of brakes, not belts. Hence, option (b) is correct.
A machine in which a metal cutting operation is performed by means of a rotating abrasive wheel that acts as a cutting tool and is used to finish workpiece which must show a high surface quality, accuracy of shape and dimension is
A)
Drilling machine
B)
Grinding machine
C)
Boring machine
D)
None of these
A grinding machine uses a rotating abrasive wheel as the cutting tool. It is mainly used for finishing operations where high surface quality, close dimensional accuracy, and accurate shape are required. Drilling machines are used for making holes, and boring machines are used to enlarge and finish existing holes, so they do not match the description.
The shear stress is tangential to the area over which it acts
A)
True
B)
False
C)
Both (a) & (b)
D)
None of these
Shear stress acts parallel or tangential to the surface/area on which it acts, unlike normal stress which acts perpendicular to the area. Therefore, the statement is correct. Options (b), (c), and (d) are incorrect.
A method of uniting two or more pieces of metal by means of a fusible alloy or metal, applied in the molten state is
A)
Welding
B)
Soldering
C)
Balancing
D)
None of these
The process of joining two or more metal pieces using a fusible alloy/metal applied in molten form is called soldering. In soldering, the base metals are not melted; only the filler metal (solder) melts and forms the joint. Welding differs because it generally involves melting the base metal itself. Therefore, option (b) is correct.
For balancing single cylinder engine, a counter weight is added to
A)
Gudgeon pin
B)
Piston
C)
Connecting rod
D)
Crankshaft
In a single-cylinder engine, balancing is achieved by adding a counterweight to the crankshaft to counteract the rotating and partially reciprocating masses. The crankshaft counterweight helps reduce vibration and improve smooth operation. The gudgeon pin, piston, and connecting rod are moving parts, but the counterweight is not added to them for balancing.
Inspection is considered to be a tool of
A)
Quality control
B)
Material management
C)
Production control
D)
Plant layout
Inspection is used to check whether the product, material, or work conforms to the required standards. In industrial engineering, it is regarded as a key tool of quality control because it helps detect defects and maintain quality. The other options are not correct: material management deals with procurement and inventory, production control deals with scheduling and monitoring production, and plant layout concerns arrangement of machines and facilities.
Certain statistical techniques have been derived to evaluate machines, materials and processes by observing capabilities and trends so that continual analysis and predictions may be made to control the desired quality level. The statistical techniques are called
A)
Fundamental of statistics
B)
Statistical quality control methods
C)
Sampling inspection
D)
None of these
The question describes statistical techniques used to study machines, materials, and processes, observe trends, and make predictions to maintain the desired quality level. This is the definition of Statistical Quality Control (SQC) methods. Option (c) sampling inspection is only one part of quality control, not the broad technique described. Option (a) fundamental of statistics is too general. Therefore, the correct answer is (b).
Brakes are machine elements
A)
that absorb either kinetic or potential energy in the process of slowing down or stopping moving parts
B)
that permits the connection and disconnection of shafts
C)
to store fuel
D)
None of these
A brake is a machine element used to slow down or stop a moving body by converting its kinetic energy into heat; in some cases it also absorbs potential energy. Option (b) describes a clutch, not a brake. Option (c) is unrelated. Therefore, (a) is correct.
The power (in horse power) transmitted by a belt drive is (T1 = belt tension in tight side, T2 = belt tension in loose side and V = belt speed)
A)
Power = ma
B)
Power = (T1 - T2)V / 550
C)
Power = (T1 + T2)V / 550
D)
None of these
In a belt drive, the useful power transmitted is the product of the effective driving force and belt speed. The effective driving force is the difference between the tight-side and loose-side tensions, i.e. (T1 - T2). So, power in ft-lb/s is (T1 - T2) × V. To convert to horsepower, divide by 550 since 1 hp = 550 ft-lb/s. Therefore, Power = (T1 - T2)V / 550. Option (c) is incorrect because the sum of tensions does not represent the driving force.
Which of the following does not form part of the effects which were obtained by Annealing process?
A)
Soften the steel
B)
Relieve internal stresses
C)
Improve machinability
D)
None of these
Annealing is a heat treatment process used to make steel softer, relieve internal stresses, and improve machinability. Since all three listed effects are obtained by annealing, none of the options (a), (b), or (c) is incorrect. Therefore, the correct answer is (d) None of these.
Which of the following is not basic area of inspection?
A)
Receiving inspection
B)
Final inspection
C)
Inprocess inspection
D)
Production
Basic areas of inspection in quality control generally include receiving inspection, in-process inspection, and final inspection. These are checkpoints used to ensure quality at different stages. Production itself is not an inspection area; it is the manufacturing/activity stage where inspection may take place.
The tools which are used for checking the size, shape and relative positions of various parts but not provided with graduated adjustable members are
A)
Gauges
B)
Measuring tape
C)
Laser
D)
None of these
Gauges are inspection tools used to check the size, shape, and relative positions of parts. They are generally not provided with graduated adjustable members. Measuring tape is a linear measuring instrument, and laser is used for measurement/alignment in different contexts, not for this definition.
A governor is a device
A)
to control temperature variation
B)
to slowdown the speed
C)
to control speed variation in an engine and controls the amount of fuel to an engine to match the load requirement to maintain in a specific speed
D)
None of these
A governor is used in engines to regulate the mean speed when the load changes. It does this by adjusting the fuel supply so that the engine maintains nearly constant speed. Option (a) is about temperature control, which is unrelated. Option (b) is incorrect because a governor does not simply slow down speed; it regulates it. Option (d) is wrong because option (c) correctly describes the function of a governor.
The maximum and minimum pressure in a plate clutch where the axial force is 1000 lb (the inside radius of contact is Ri =2 in, the outside radius is Ro = 4 in) is 39.8 psi and 19.9 psi respectively. If uniform wear is assumed, the Average pressure is
A)
29.85 psi
B)
26.5 psi
C)
19.9 psi
D)
None of these
For a plate clutch with **uniform wear**, pressure varies inversely with radius: p = C/r. Hence the maximum pressure occurs at the inner radius and the minimum pressure at the outer radius.
Given:
- p_max = 39.8 psi
- p_min = 19.9 psi
The average pressure for uniform wear is the mean of maximum and minimum pressures:
p_avg = (p_max + p_min) / 2 = (39.8 + 19.9) / 2 = 29.85 psi.
So the correct answer is **29.85 psi**.
Why others are incorrect:
- **26.5 psi** is not the arithmetic mean of the given pressures.
- **19.9 psi** is only the minimum pressure.
- **None of these** is incorrect because 29.85 psi is present in the options.
In factories the power or rotary motion from one shaft to another is usually transmitted by means of
A)
Crankshaft
B)
Belts or ropes
C)
H.T lines
D)
None of these
In factories, rotary motion from one shaft to another is commonly transmitted by flexible power transmission elements such as belts or ropes. They are widely used because they can transmit motion over some distance and tolerate slight misalignment. A crankshaft is used to convert reciprocating motion to rotary motion, not for shaft-to-shaft power transmission. H.T. lines are for electrical power transmission, not mechanical rotary motion.
The law, which states that strain is proportional to the stress producing it, is called
A)
Newton law
B)
Hooke’s law
C)
Goodman’s law
D)
None of these
The statement that strain is directly proportional to the stress producing it is Hooke’s law, valid within the elastic limit of a material. Newton’s law relates force and motion, and Goodman’s law is used in fatigue analysis, so they are not correct.
A process of generating a gear by means of a cutter that revolves and cuts like a milling cutter is called
A)
Rack cutter process
B)
Gear hobbing
C)
Slotting
D)
None of these
In gear hobbing, the gear blank is generated by a rotating cutter called a hob, which cuts continuously in a manner similar to a milling cutter. This is a standard gear manufacturing process based on generation. Rack cutter process uses a rack-type cutter, while slotting is a different machining process used mainly for internal surfaces and keyways. Therefore, the correct answer is Gear hobbing.
Which is not column & knee type milling machine?
A)
Hand milling machine
B)
Plain milling machine
C)
Triplex milling machine
D)
Vertical milling machine
Column-and-knee type milling machines include hand milling machines, plain milling machines, and vertical milling machines. A triplex milling machine is not a column-and-knee type; it is a special-purpose milling machine having three spindle heads for simultaneous machining.
A metal cannot exist in the
A)
Gaseous state
B)
Liquid state
C)
Solid state
D)
None of these
Metals are generally found in the solid state at ordinary conditions, and some can exist in the liquid state when heated above their melting points. In basic material science, a metal is not considered to exist in the gaseous state under normal conditions. Therefore, the correct option is (a) Gaseous state. Option (b) is possible for metals like mercury at higher temperatures or for melted metals, and option (c) is the most common natural state of metals.
__________ is generally done to improve machinability of steel.
A)
Tempering
B)
Annealing
C)
Normalising
D)
Cyaniding
Annealing is generally done to improve the machinability of steel. It softens the metal, reduces hardness, and relieves internal stresses, making cutting and shaping easier. Tempering mainly increases toughness after hardening, normalising refines grain structure, and cyaniding is a surface hardening process.
A process of joining similar metals by application of heat with or without application of pressure and addition of filler material is called
A)
Smithing
B)
Forging
C)
Pattern making
D)
Welding
Joining similar metals by applying heat, with or without pressure and filler material, is the definition of welding. Smithing and forging are metal shaping processes, while pattern making is related to foundry work, not joining metals.
The most rapid method of forming metal into desired shapes by plastic deformation in between rolls is
A)
Tempering
B)
Rolling
C)
Hardening
D)
None of these
The process of forming metal into desired shapes by plastic deformation between rolls is called rolling. In rolling, the metal is passed through rotating rolls that reduce thickness or change cross-section efficiently and rapidly. Tempering and hardening are heat-treatment processes, not shaping processes, so they are incorrect.