# Engineering/Mechanical Engineering Design MCQ SET 03 Sample Test,Sample questions

## Question: ` 18/8 steel contains`

1.18% nickel and 8% chromium

2. 18% chromium and 8% nickel

3.18% nickel and 8% vanadium

4. 18% vanadium and 8% nickel

## Question: ` A bolt is designed on the basis of __________ with a large factor of safety.`

1.Direct tensile stress

2.Direct compressive stress

3.Direct bending stress

4.Direct shear stress

## Question: ` A bolt of M 24 Ã— 2 means that`

1.The pitch of the thread is 24 mm and depth is 2 mm

2.Cross-sectional area of the threads is 24 mmÂ²

3.The nominal diameter of bolt is 24 mm and pitch is 2 mm

4.The effective diameter of bolt is 24 mm and there are 2 threads per cm

1.l/2

2. l/âˆš2

3. l

4.2 l

## Question: ` A feather key is generally`

1.Loose in shaft and tight in hub

2.Tight in shaft and loose in hub

3.Tight in both shaft and hub

4. Loose in both shaft and hub

## Question: ` A hollow saddle key is`

1.A taper key which fits half in the key way of hub and half in the key way of shaft

2.A taper key which fits in a key way of the hub and is flat on the shaft

3.A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

4.Provided in pairs at right angles and each key is to withstand torsion in one direction only

1.Plasticity

2.Elasticity

3.Ductility

4.Malleability

2. Hollow key

3. Soft key

4.None of these

## Question: ` A type of brake commonly used in motor cars is a`

1.Shoe brake

2.Band and block brake

3.Band brake

4.Internal expanding brake

1.1/sinÎ¸

2.1/cosÎ¸

3.1/tanÎ¸

4.sinÎ¸ cosÎ¸

1.0.4 times

2.0.6 times

3.0.7 times

4.0.8 times

## Question: ``` If a spring is cut down into two springs, the stiffness of cut springs will be ```

1.Half

2.Same

3.Double

4. None of the above

## Question: ``` If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio ```

1.Increases

2.Decreases

3.Remains unchanged

4.None of these

1. 2 d

2. 3 d

3. 4 d

4.5 d

## Question: ``` In second type of levers, ```

1. Load is in between the fulcrum and effort

2.Effort is in between the fulcrum and load

3.Fulcrum is in between the load and effort

4.None of these

1.Less than

2.Equal to

3.More than

4.None of these

## Question: ``` In V-belt drive, belt touches ```

1.At bottom

2.At sides only

3.Both at bottom and sides

4.Could touch anywhere

## Question: ` Rankine Gordon formula for buckling is valid for`

1. Long column

2.Short column

3. Short and long column

4.Very long column

## Question: ``` Stress concentration is caused due to ```

1. Variations in load acting on a member

2.Variations in properties of materials in a member

3.Abrupt change of cross-section

4.All of these

## Question: ` The maximum efficiency of a square threaded screw is`

1.(1 - sinÏ†)/ (1 + sinÏ†)

2.(1 + sinÏ†)/ (1 - sinÏ†)

3. (1 - sinÏ†)/ (1 + cosÏ†)

4. (1 + cosÏ†)/ (1 - sinÏ†)

## Question: ` The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where Tâ‚, and Tâ‚‚ = Tensions on the tight and slack sides of belt respectively, Î¼ = Coefficient of friction, between the belt and pulley, and Î¸ = Angle of contact)`

1.Tâ‚/Tâ‚‚ = Î¼Î¸

2. log (Tâ‚/Tâ‚‚) = Î¼Î¸

3.Tâ‚/Tâ‚‚ =eÎ¼Î¸

4. Tâ‚/Tâ‚‚ = log Î¼Î¸

1.Base circle

2.Pitch circle

3.Prime circle

4.Pitch curve

## Question: ` When the screw in a mechanical screw jack rotates, the load kept on the top of it moves`

1.Axially upwards

2. Axially downwards

3.Axially upwards or downwards

4.None of these

1.Stiffness

2.Ductility

3.Resilience

4.Plasticity

## Question: ` While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as`

1.Both the ends fixed

2.Both the ends hinged

3.One end fixed and the other end hinged

4.One end fixed and the other end free

## Question: `. The distribution of the forces along the length of key fitted in a shaft`

1. Varies linearly

2. Is uniform throughout

3.Varies exponentially, being more near the torque-input end

4.Varies exponentially, being less near the torque-input end

## Question: `A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mmÂ². The maximum hoop stress developed in the inner cylinder is`

1. 3.6 N/mmÂ² compression

2. 3.6 N/mmÂ² tension

3. 7.2 N/mmÂ² compression

4. 7.2 N/mmÂ² tension

1. âˆš2P/s.l

2.P/2.s.l

3.P/âˆš2.s.l

4. 2P/s.l

## Question: `A key way lowers`

1. The strength of the shaft

2.The rigidity of the shaft

3.Both the strength and rigidity of the shaft

4.The ductility of the shaft

1.1

2.2

3.3

4.4

## Question: `According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by`

1.Equating tearing resistance of the plate to the shearing resistance of the rivets (B)

2.Equating tearing resistance of the plate to the crushing resistance of the rivets

3.Equating shearing resistance to the crushing resistance of the rivets

4.None of these

## Question: `According to Indian standard specifications, 100 H6/g5 means that`

1.Tolerance grade for the hole is 6 and for the shaft is 5

2. Tolerance grade for the shaft is 6 and for the hole is 5

3.Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

4.Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

## Question: ```According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the (A) ```

1.Carbon content is 2%

2.Maximum compressive strength is 200 N/mmÂ²

3.Minimum tensile strength is 200 N/mmÂ²

4.Maximum shear strength is 200 N/mmÂ²

1.Welding

2.Pre-casting

3.Riveting

4.Casting

## Question: `Allen bolts are`

1. Self locking bolts

2.Designed for shock load

3.Used in aircraft application

4.Provided with hexagonal depression in head

1.One-eighth

2.One-fourth

3.One-half

4.Double

## Question: ```Belt slip may occur due to ```

2.Loose belt

3. Driving pulley too small

4. All of the above

## Question: ```If the centre distance of the mating gears having involute teeth is increased, then the pressure angle ```

1.Increases

2.Decreases

3.Remains unchanged

4.None of these

1. 0.5 times

2. Equal to

3.2 times

4.Double

## Question: ```In a gear, having Involute teeth, the normal to the Involute is a tangent to the ```

1.Base circle

2.Pitch circle

4. Dedendum circle

1.1.2 d

2.1.6 d

3.2 d

4.2.5 d

## Question: `In levers, leverage is the ratio of`

1.Load lifted to the effort applied

2. Mechanical advantage to the velocity ratio

3.Load arm to the effort arm

4.Effort arm to the load arm

## Question: ```In oilness bearings ```

1.The oil film pressure is generated only by the rotation of the journal

2.The oil film is maintained by supplying oil under pressure

3. Do not require external supply of lubricant

4. Grease required to be applied after some intervals

## Question: `In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that`

1.The effect of curvature of the cylinder wall is neglected

2.The tensile stresses are uniformly distributed over the section of the walls

3.The effect of the restraining action of the heads at the end of the pressure vessel is neglected

4.All of the above

## Question: `Oldham coupling is used to connect two shafts`

1. Which are perfectly aligned

2.Which are not in exact alignment

3.Which have lateral misalignment

4.Whose axes intersect at a small angle

## Question: ```The acme threads are usually found on ```

1.Spindles of bench vices

2.Railway carriage couplings

3.Feed mechanism of machine tools

4.Screw cutting lathes

1.T/2

2. T

3.2 T

4. 4 T

## Question: `The bending stress in a curved beam is`

1. Zero at the centroidal axis

2. Zero at the point other than centroidal axis

3.Maximum at the neutral axis

4.None of these

1. Îµc + 2Îµl

2.2Îµc + Îµl

3. Îµc + ÎµlÂ²

4.ÎµcÂ² + Îµl

## Question: ```The coefficient of friction in belt drive depends upon ```

1.Material of belt

2.Material of pulley

3.Materials of belt and pulley

4.Belt velocity

## Question: ```The connecting rod bolts are tightened up so that tightening stress ```

1.Is just sufficient to hold parts together

2.Approaches yield point

3.Is 50% of yield point

4.Is about yield point divided by safety factor

## Question: `The connecting rod bolts are tightened up with initial tension greater than the external load so that`

1.Joint may not open up

2.Bolts are weakest elements

3.The resultant load on the bolt would not be affected by the external cyclic load

4.Bolts will not loosen during service

## Question: `The cross-section of the arm of a bell crank lever is`

1. Rectangular

2. Elliptical

3.I-section

4. Any one of these

## Question: `The effective stress in wire ropes during normal working is equal to the stress due to`

1. Axial load plus stress due to bending

2.Acceleration/retardation of masses plus stress due to bending

3. Axial load plus stress due to acceleration/retardation

4.Bending plus stress due to acceleration/retardation

## Question: ```The face of the tooth is the ```

1.Surface of the top of the tooth

2.Surface of the tooth above the pitch surface

3.Surface of the tooth below the pitch surface

4.Width of the tooth measured along the pitch circle

## Question: ```The form factor of a helical gear __________ with the increase in the helix angle. ```

1.Increases

2.Decreases

3.Remains constant

4.None of these

1.45Â°

2.60Â°

3.75Â°

4. 90Â°

1.10Â°-20Â°

2.30Â°-40Â°

3.40Â°-60Â°

4.60Â°-80Â°

1.Low

2.High

3.Moderate

4.None of these

## Question: `The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as`

1.(Kf + 1)/ (Kt + 1)

2. (Kf - 1)/ (Kt - 1)

3.(Kt + 1)/ (Kf + 1)

4.(Kt - 1)/ (Kf - 1)

## Question: `The objective of caulking in a riveted joint is to make the joint`

1. Free from corrosion

2.Stronger in tension

3. Free from stress

4. Leak-proof

## Question: `The process which improves the machinability of steels, but lowers the hardness and tensile strength is`

1. Normalising

2.Full annealing

3.Process annealing

4.Spheroidising

2.Dedendum

3.Clearance

4.Working depth

## Question: ```The resistance to fatigue of a material is measured by ```

1.Elastic limit

2.Ultimate tensile strength

3.Young's modulus

4.Endurance limit

## Question: `The resultant axial load on a bolt depends on`

1. Initial tension

3.Relative elastic yielding (springness) of the bolt and the connected member

4.All of the above

1.Equal to

2. Less than

3.Greater than

4.None of these

## Question: `Two closely coiled helical springs with stiffness kâ‚ and kâ‚‚ respectively are connected in series. The stiffness of an equivalent spring is given by`

1.(kâ‚ kâ‚‚)/ (kâ‚ + kâ‚‚)

2. (kâ‚ - kâ‚‚)/ (kâ‚ + kâ‚‚)

3. (kâ‚ + kâ‚‚)/ (kâ‚ kâ‚‚)

4.(kâ‚ - kâ‚‚)/ (kâ‚ kâ‚‚)

## Question: `Two shafts â€˜Aâ€™ and â€˜Bâ€™ under pure torsion are of identical length and identical weight and are made of the same material. The shaft â€˜Aâ€™ is solid and the shaft â€˜Bâ€™ is hollow. We can say that`

1.Shaft B is better than shaft A

2. Shaft A is better than shaft B

3.Both the shafts are equally good

4.None of these

1. Increases

2.Decreases

3.Remain same

4.None of these

1.0.20

2.0.35

3.0.50

4.0.65

## Question: `When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)`

1.(WD/ Ï€d3) Ã— K

2. (2WD/ Ï€d3) Ã— K

3. (4WD/ Ï€d3) Ã— K

4.(8WD/ Ï€d3) Ã— K

1.Brown colour

2.Yellow colour

3.White colour

4. Grey colour

1. Short bearing

2.Long bearing

3.Medium bearing

4.Square bearing

1. Bolt

2.Tap bolt

3.Stud

4.None of these

## Question: `Which of the following spring is used in mechanical wrist watch?`

1. Helical compression spring

2.Spiral spring

3.Torsion spring

4.Belleville spring

## More MCQS

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