# Multiple choice question for engineering

## Set 1

1. Piston rod is an example of column.

a) True

b) False

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2. Bucking of column means

a) Lateral deflection

b) Axial deflection

c) Torsional deflection

d) None of the listed

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3. Slenderness ratio is [l= length of column and k= least radius of gyration of cross section about its axis].

a) l/k

b) k/l

c) l/2k

d) k/2l

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4. Columns with what slenderness ratio are not designed with respect to buckling but are designed for compressive stresses.

a) >1

b) <1

c) >30

d) <30

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5. If slenderness ratio=45, which mode of failure will dominate?

a) Buckling

b) Compressive Stresses

c) Both buckling and compressive stress

d) Can’t be stated

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6. Short column and long column are classified on the basis of

a) Slenderness ratio

b) Diameter

c) Length

d) None of the listed

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7. Cast iron column with a slenderness ratio of 75 are

a) Short Columns

b) Long Columns

c) Very short columns

d) None of the listed

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8. Steel columns with a slenderness ratio of 95 are

a) Short Columns

b) Long columns

c) Very long columns

d) None of the listed

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9. Which of the following are true for End fixity coefficient

a) Dimensionless number

b) Used in Euler’s equation

c) Provides condition of restraint at two ends

d) All of the listed

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10. Value of end fixity coefficient for both hands fixed is

a) 1

b) 4

c) 2

d) 0.25

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## Set 2

1. Calculate the coefficient of fluctuation of speed if maximum speed is 2500rpm and minimum speed is 1800rpm.

a) 1.44

b) 1.33

c) 0.33

d) 0.44

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2. Calculate the coefficient of steadiness if maximum speed of flywheel is 2500rpm and minimum speed is 1800rpm.

a) 3.03

b) 0.33

c) 0.44

d) 3.99

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3. Figure 1

Answer the questions i-v with respect to figure 1.

3. i. Calculate the mean torque T supplied by motor (Torque vs. theta graph of a flywheel is shown above).

a) 3000N-m

b) 1500N-m

c) 2000N-m

d) 2500N-m

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4. ii. The point where angular velocity is maximum is?

a) A

b) B

c) C

d) D

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5. iii. The point where velocity of flywheel is maximum is

a) A

b) B

c) C

d) D

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6. iv. Calculate the energy output from flywheel.

a) 500π

b) 150π

c) 200π

d) 250π

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7. iv. Torque vs. theta graph of a flywheel is shown. Coefficient of fluctuation of speed is 0.2 and the mean angular velocity of the machine is 25 rad/s. Thickness of flywheel is 20mm and density of steel used is 7700kg/mᵌ.

Calculate the outer radius of the flywheel.

a) 402mm

b) 202mm

c) 540mm

d) 468mm

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8. Figure 2

The turning moment diagram of a multi cylinder engine is shown. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm².

Answer questions i-v with respect to figure 2

8. i. Calculate the energy at point B if energy assumed at point A is U.

a) U

b) U-300

c) U+300

d) U-150

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9. ii. Calculate the energy at point C if energy at point A is U.

a) U-550

b) None of the listed

c) U+550

d) U+550

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10. iii. Calculate the energy at point F if energy at A is u.

a) U+340

b) U+260

c) U+400

d) Can’t be determined

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11. iv. Calculate the maximum energy.

a) U+1000

b) U+950

c) U+630

d) U+600

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12. iv. Calculate the point of minimum energy.

a) U+480

b) U+650

c) U-300

d) U-450

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13. v. Calculate the net energy output from the flywheel.

a) 1300mm²

b) 1400mm²

c) 1250mm²

d) 1500mm²

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14. Feather key can be used to prevent axial motion between two elements.

a) True

b) False

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15. Keyed joints never lead to stress concentration on shafts.

a) True

b) False

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## Set 3

1. Autofrettage is beneficial for the high pressure cylinder.

a) True

b) False

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2. Autogreggate is a process of ___ stressing the cylinder.

a) Pre

b) Post

c) Over

d) None of the listed

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3. Can we pre-stress the cylinder by subjecting cylindrical portion near inner diameter in plastic range and outer diameter is still in the elastic range.

a) True

b) False

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4. A compound cylinder consists of

a) 2 cylinders

b) Cylinder and a jacket

c) 2 jackets

d) At least two cylinders

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5. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the shrinkage pressure.

a) 5.88N/mm²

b) 2.28N/mm²

c) 4.56N/mm²

d) 3.66N/mm²

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6. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the interference [E=210kN/mm²].

a) 2.8mm

b) 4.6mm

c) 5.4mm

d) 4.8mm

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7. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the radial stresses due to shrink shift in jacket.

a) +2.56[(45/r) ² – 1]

b) 1.824[(45/r) ² – 1]

c) -1.824[(45/r) ² – 1]

d) None of the listed

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8. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the tangential stresses due to shrink shift in jacket.

a) +2.56[(45/r) ² – 1]

b) 1.824[(45/r) ² – 1]

c) -1.824[(45/r) ² – 1]

d) None of the listed

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9. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the radial stress due to shrink shift in inner tube.

a) +3.04[1-(15/r) ²]

b) -3.04[1-(15/r) ²]

c) -3.04[1-(10/r) ²]

d) +3.04[1-(10/r) ²]

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10. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the tangential stress due to shrink shift in inner tube.

a) +3.04[1+ (15/r) ²]

b) -3.04[1+ (15/r) ²]

c) -3.04[1-(10/r) ²]

d) +3.04[1-(10/r) ²]

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11. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². In service the cylinder is further subjected to an internal pressure of 25MPa. Calculate the radial stress in compound cylinder.

a) -3.75[(45/r) ² – 1]

b) +3.75[(45/r) ² – 1]

c) -3.75[(45/r) ² -+1]

d) +3.75[(45/r) ² +1]

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12. A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². In service the cylinder is further subjected to an internal pressure of 25MPa. Calculate the tangential stress in compound cylinder.

a) -6.75[(45/r) ² + 1]

b) +3.75[(45/r) ² +1]

c) -3.75[(45/r) ² +1]

d) -3.75[(45/r) ² -1]

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13. A gasket is a device to allow easy diffusion of fluids across mating surfaces of a mechanical assembly.

a) True

b) False

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14. Asbestos gaskets like other non-metallic gaskets can be used only up to a temperature of 70⁰C.

a) True

b) False

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## Set 4

1. A cylinder is considered thin when the ratio of inner diameter to wall thickness is more than 5.

a) True

b) False

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2. Tangential stress in a cylinder is given by [symbols have their usual meanings].

a) PD/2t

b) 2PD/t

c) PD/4t

d) 4PD/t

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3. Longitudinal stress in a cylinder is given by [symbols have their usual meanings].

a) PD/2t

b) 2PD/t

c) PD/4t

d) 4PD/t

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4. A seamless cylinder of storage capacity of 0.03mᵌis subjected to an internal pressure of 21MPa. The ultimate strength of material of cylinder is 350N/mm².Determine the length of the cylinder if it is twice the diameter of the cylinder.

a) 540mm

b) 270mm

c) 400mm

d) 350mm

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5. A seamless cylinder of storage capacity of 0.03mᵌis subjected to an internal pressure of 21MPa. The ultimate strength of material of cylinder is 350N/mm².Determine the thickness of the cylinder if it is twice the diameter of the cylinder.

a) 12mm

b) 4mm

c) 8mm

d) 16mm

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6. Cylinder having inner diameter to wall thickness ratio less than 15 are

a) Thin cylinders

b) Thick Cylinders

c) Moderate cylinders

d) None of the listed

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7. Lame’s equation used to find the thickness of the cylinder is based on maximum strain failure.

a) True

b) False

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8. Lame’s equation is generally used for ductile materials.

a) True

b) False

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9. The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 45N/mm². Calculate the thickness of the cylinder using Lame’s equation. Diameter of the cylinder is 40mm and pressure in cylinder is 10MPa.

a) 2.05mm

b) 4.2mm

c) 5.07mm

d) None of the listed

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10. The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 70N/mm². Calculate the thickness of the cylinder using Clavarinoe’s equation. Diameter of the cylinder is 240mm.μ=0.3 and pressure in cylinder is 15MPa.

a) 35mm

b) 30mm

c) 27mm

d) None of the listed

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## Set 5

1. Compression Ratio in diesel engine is lesser than that in Spark Ignition engine.

a) True

b) No

c) They are equal

d) Doesn’t matter

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2. Petrol engine are more economical than diesel engine.

a) True

b) False

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3. There are ____ types of liners.

a) 1

b) 2

c) 3

d) 4

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4. If no re boring allowance is to be given, then thickness of cylinder wall is max pressure is 3.5N/mm², bore diameter=200mm and permissible tensile stress is 40N/mm².

a) 7mm

b) 8mm

c) 9mm

d) 10mm

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5. If diameter of cylinder of bore is 120mm, then thickness of the cylinder will be

a) Information not sufficient

b) 7mm

c) 12mm

d) 6mm

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6. If diameter of cylinder bore is 120mm, then thickness of dry liner will be

a) 2.2mm

b) 3.6mm

c) 4.8mm

d) 6mm

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7. If diameter of cylinder bore is 120mm, then thickness of water jacket wall will be

a) 4.26mm

b) 5.25mm

c) 2.56mm

d) All of the listed

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8. If diameter of cylinder bore is 120mm, then thickness of water cylinder flange will be

a) 8.8mm

b) 10.2mm

c) 7.8mm

d) 12mm

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9. If nominal diameter of bolt used is 20mm, then find the radial distance between outer diameter of flange and pitch circle diameter of studs.

a) 24mm

b) 28mm

c) 32mm

d) 36mm

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10. The circumferential hoop stress and longitudinal stress are both shear stress.

a) True

b) False

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11. The circumferential hoop stress and longitudinal stress act in same direction and hence are straight away added.

a) True

b) False