Consider the following motions :
1. Piston reciprocating inside an engine cylinder
2. Motion of a shaft between foot-step bearings
Which of the above can rightly be considered as successfully constrained motion?

A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which leaves the shaft balanced statically.The dynamic reactions at the supports will be

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?

In a circular are cam with a roller follower, acceleration of the follower depends on
1. cam speed and location of centre of circular arc
2. roller diameter and radius of circular arc
Which of the above is/are correct?

A manufacturing company is selling a product for 15 per unit with variable cost of  10 per unit. The fixed cost of the asset is 50,000. How many units should be produced to breakeven?

Hot wire anemometer is used to measure_______________?

A gear of 28 cm pitch circle diameter has 40 teeth. The circular pitch will nearly be

Consider the following statements regarding gear tooth designing for gear drive :
1. Tooth profiles not designed as per ‘law of gearing’ will cause vibration and impact problems even at low speed.
2. As the gears go through their mesh, the pitch point must remain stationary on the line of centres.
3. In a correctly designed tooth profile, the line of action of successive instantaneous points of contact will pass through the stationary pitch point.
Which of the above statements are correct?

The flywheel of a steam engine has a radius of gyration of 1 m and mass 2000 kg. The starting torque of the engine is 2000 N-m. The kinetic energy of the flywheel after 10 seconds from start is

Consider two shafts connected with two gears as per the following options :
1. One on each shaft.
2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only.
3. Through an intermediate gear mounted on an intermediate shaft having two gears, whereas the other shafts have one gear each
Which of the above represent(s) a simple gear train?

A riveting machine is driven by a constant-torque 3 kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. What is the speed (to nearest 10 r.p.m.) after riveting and what is the number of rivets that can be closed per minute?

Which one of the following statements is correct?

The thickness of the continuous weld used for connecting a horizontal square bar of 150 mm size and of cantilevered length 500 mm to a vertical plate, with the bar carrying a 25 kN vertical load at its outer tip, given that the permissible direct shear stress of the weld is 20 N/mm², is

A shaft of 50 mm diameter transmits a torque of 800 N-m. The width of the rectangular key used is 10 mm. The allowable shear stress of the material of the key being 40 MPa, the required length of the key would be

A governor is said to be hunting if the speed of the engine

The diameter of the pin in a bushed pin type flexible coupling is to be increased for the purpose of

The problem of interference in involute profile gears can be overcome by which one of the following means?

The bearing modulus for a bearing is 1628. What is the bearing characteristic number considered for bearing design?

Two shafts of diameter 30 mm each are connected by a flange coupling. Six bolts, each of diameter 8 mm, are used on a pitch circle of diameter 90 mm. If the allowable shear stress of the bolt material is 80 MPa, what is the torque transmitting capacity of the bolts to the nearest 10 units?

While selecting the elements of power transmission with speed reduction, the order of preference based on a minimum cost is

A solid shaft is designed to transmit 100 kW while rotating at N r.p.m. If the diameter of the shaft is doubled and allowed to operate at 2 N r.p.m., the power that can be transmitted by the latter shaft is

What shall be the centre distance between the axes of pinion and gear when a 20° full-depth involute profile pinion with 20 teeth meshes with a gear that has 50 teeth for a module of 6 mm?

The diameter of a shaft to transmit 25 kW at 1500 r.p.m. given that the ultimate strength is 150 MPa and the factor of safety is 3, will nearly be

A thick lubrication is

If the dynamic load capacity of a ball bearing is increased to 1.5 times its earlier value without changing its equivalent load, the life of the bearing increases to

The speed of the crankshaft is found to vary between 120 r.p.m. and 150 r.p.m. during one cycle of operation. What is the coefficient of fluctuation of speed?

The state of stress at a point when completely specified enables one to determine the
1. maximum shearing stress at the point
2. stress components on any arbitrary plane containing that point
Which of the above is/are correct?

A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum normal stress on the plane will be

A metal piece under the stress state of three principal stresses 30, 10 and 5 kg/mm² is undergoing plastic deformation. The principal strain rates will be in the proportions of

An isotropic elastic material is characterized by

The Miller indices of a material in a plane are proportional to

The modulus of elasticity of E-glass is 72 GPa and that of epoxy resin is 3 GPa. The modulus of elasticity (to the nearest unit magnitude) for a composite material consisting of 60% by volume of continuous E-glass fibre and 40% epoxy resin for the matrix, when stressed under isostress conditions, is

In developing abrasive ceramics which are used to wear, grind or cut away other materials which are (necessarily) softer, they should have, besides wear resistance,
1. a high degree of toughness
2. a low degree of toughness
3. refractoriness
Which of the above is/are correct?

Consider the following in case of high-energy forming processes :
1. The evacuation between die and blank in explosive forming is done by a vacuum pump.
2. The pressure waves produced in water in explosive forming deform the blank to the die shape.
3. The electrohydraulic forming makes use of discharge of large amount of electrical energy used in a capacitor blank.
4. In Petroforge, the piston is moved by combustion of fuel moving at the rate of 150-200 m/s.
Which of the above are correct?

In abrasive jet machining process, the main mechanism of material removal takes place due to

Consider that the following materials are usable for manufacturing dies, moulds in investment casting process for the purpose of large-scale production :
1. Aluminum alloy
2. Magnesium alloy
3. Brass
4. Low-carbon steel
Which of the above are correctly usable?

The occurrence of casting defect ‘rat tail’ is possible because of
1. soft ramming of sand
2. continuous large flat surface on the mould
3. excessive hardness of the mould
Which of the above reasons are correct?

Components produced by die casting have finer grain, higher strength and greater hardness at the skin than at the centre due to

A 125 mm long, 10 mm diameter stainless steel rod is being turned to 9 mm diameter, 0.5 mm depth of cut. The spindle rotates at 360 r.p.m. With the tool traversing at an axial speed of 175 mm/min, the metal removal rate is nearly

The feed in face milling for a width of 70 mm with a cutter of 160 mm diameter, having 10 inserts and rotating at 360 r.p.m., with a feed rate of 0.5 m/min, is nearly

A lathe consumes 500 W when running idle and 2500 W when cutting a steel specimen at 30 m/min. If the depth of cut is 4 mm and feed rate is 0.25 mm/rev, the cutting force and the approximate value of torque at a spindle run of 120 r.p.m. will respectively be

For a shaper, the length of stroke is 210 mm, the number of double strokes per minute is 32 and the ratio of return time to cutting time is  2 : 3. The cutting speed will be

The headstock of a lathe has 9 speeds with minimum speed of 100 r.p.m. and maximum speed of 1600 r.p.m. If the speeds are in geometric progression, then the ratio is

Surface cracking occurring at low temperatures in hydrostatic extrusion is known as

Flank wear occurs mainly on the
1. nose part of the cutting tool
2. front relief face and side relief face of the cutting tool
3. face of the cutting tool at the shortest distance from the cutting edge
Which of the above is/are correct?

A part programme for any arbitrary object is given as follows :
N001     G91      G71 M03           S600     EBOB
N002     G00      X 10.00             Y10.00 EOB
N003     G00      Z–10.00            EOB
N004     G83      Z–60.00            F100     EOB
N005     G80      EOB
N006     M02      EOB
The above programming format will be used as Canned cycle for

In case of TIG welding of aluminum alloys, the amount of shielding gas used can be determined from the band of white deposit (aluminum oxide) alongside of the weld bead. A hairline width white band indicates that the quantum of shielding gas used has been
1. more than required
2. lesser than required
3. adequate as required
Which of the above is correct?

A cylindrical Robot can reach any point in a cylinder of height L and radius 2L, except for the points in an inner cylinder of height L and radius L. The volume for the cylindrical Robot work envelope will be

Consider the following statements about forging:
1. Forgings have high strength and ductility.
2. Forgings offer great resistance to impact and fatigue loads.
3. Forging assures uniformity in density as well as dimensions of the forged parts.
Which of the above statements are correct?

Endurance limit is of primary concern in the design of a/an
1. rotating shaft
2. industrial structure
3. column
4. machine base
Which of the above is/are correct?