1) Which criteria of failure is used to indicate St Venent's theory?
a. Maximum principle stress theory
b. Maximum principle strain theory
c. Shear stress theory
d. None of the above
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2) The ratio of di / t for thick cylinder is __________
(where di = inner diameter, t = wall thickness)
a. greater than 20
b. less than 20
c. equal to 20
d. none of the above
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3) A cylinder made of plain carbon steel has inner diameter 100 mm. What is the thickness of cylinder if maximum internal pressure of 20 Mpa acts on it? ( σall = 100 N/mm2 & poisson's ratio = 0.3)
a. 11 mm
b. 15.36 mm
c. 22.32 mm
d. 80 mm
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4) What does DFMA stand for?
a. Design for Manual Assembly
b. Design for Manufacture and Assembly
c. Both a. and b.
d. None of the above
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5) Which of the following principle recognizes human capabilities and limitations using design effective handling equipment?
a. Safety principle
b. Obsolescence principle
c. Ecology principle
d. Ergonomic principle
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6) Which type of welded joints are not included in class 3 pressure vessels?
a. Double welded butt joint with full penetration
b. Single welded but joint with back strip
c. Single full fillet lap joints
d. None of the above
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7) Class 3 pressure vessels having welded joints are __________
a. fully radio-graphed
b. partially radio-graphed
c. spot radio-graphed
d. not radio-graphed
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8) Design pressure for unfired pressure vessels is 1.05 times of _______
a. minimum working pressure
b. maximum working pressure
c. hydrostatic test pressure
d. none of the above
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9) Internal pressure of 2.5 Mpa acts on a pressure vessel of thickness 15 mm and internal diameter of 1500 mm. What is the stress induced in longitudinal direction?
a. 36.63 N/mm2
b. 59.13 N/mm2
c. 65.62 N/mm2
d. 131.25 N/mm2
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10) Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm2 to 1.5 N/mm2?
a. Plain formed head
b. Torispherical dished head
c. Semi-elliptical dished head
d. All of the above
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11) Single cylinder four stroke engine has brake power of 8 kW and brake mean effective pressure of 0.55 Mpa. What is the length of cylinder which is 1.2 times of bore diameter? (n = 3000 rpm)
a. 110 mm
b. 103 mm
c. 70 mm
d. 65 mm
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12) Which of the following parts of piston act as bearing for connecting rod side thrust?
a. Reinforcing ribs
b. Piston barrel
c. Piston gudgeon
d. Piston skirt
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13) What is the function of gudgeon pin?
a. Acts as stiffeners
b. Supports piston head
c. Connects piston to connecting rod
d. All of the above
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14) A piston has allowable tensile stress of 50 N/mm2 and has bore diameter 150 mm. Considering strength of piston, what will be the thickness of piston head if maximum pressure of 10 N/mm2 acts on it?
a. 29 mm
b. 35 mm
c. 53 mm
d. Insufficient data
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15) A piston made of gray cast iron has piston head thickness of 20 mm. What will be thickness of piston barrel under piston rings if it has allowable tensile stress of 30 N/mm2? ( Bore diameter = 50 mm & Pmax =15 N/mm2)
a. 10 mm
b. 20 mm
c. 30 mm
d. Insufficient data
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16) Failure rate for safety valve working for 400 hours is 3 x 10–6 failures/hour. What is the reliability of safety valve?
a. 0.998
b. 0.989
c. 0.888
d. 0.899
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17) If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
a. 111
b. 100
c. 10
d. 11
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18) What is meant by mean time to failure (MTTF)?
a. Mean time between two successive failure components
b. Maximum time between two successive failure components
c. Sum of survival time for number of components divided by number of failures
d. Sum of number of failures divided by survival time for number of components
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Answer
Explanation
Related Ques
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ANSWER: Sum of survival time for number of components divided by number of failures
Explanation:
No explanation is available for this question!
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19) A plain carbon steel has mean yield strength of 300 N/mm2 and standard deviation of 50 N/mm2. What is the mean and standard deviation of margin of safety, if mean tensile stress of 250 N/mm2 and standard deviation of 65 N/mm2 acts on it?
a. 23.45 N/mm2, 50 N/mm2
b. 50 N/mm2, 82 N/mm2
c. 82 N/mm2, 7.07 N/mm2
d. 7.07 N/mm2, 50 N/mm2
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20) What causes infant mortality in mechanical equipments?
a. Design errors
b. Manufacturing defects
c. Installation defects
d. All of the above
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21) Which of the following statements is true for structure/speed diagrams?
a. Structure diagrams gives range ratio of spindle speeds
b. Speed diagrams do not give range ratio of spindle speeds
c. Speed diagrams consider motor speed
d. All of the above
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22) What is the purpose of using a gear box?
a. To increase torque
b. To increase speed
c. Converts single input speed into multiple output speeds
d. All of the above
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23) Ratio of two spindle speeds is constant in _________ progression.
a. Arithmetic
b. Geometric
c. Harmonic
d. None of the above
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24) What is harmonic progression?
a. Difference between reciprocal of two successive spindle speeds is constant
b. Difference between two successive spindle speeds is constant
c. Ratio of two successive spindle speeds is constant.
d. Ratio of two successive spindle speeds is variable.
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Answer
Explanation
Related Ques
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ANSWER: Difference between reciprocal of two successive spindle speeds is constant
Explanation:
No explanation is available for this question!
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25) Diameter range is high in geometric progression due to _________ spindle speed.
a. low
b. high
c. constant
d. none of the above
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26) Which of the following statements is false for troughed belt conveyors?
1. Troughed belt conveyors use flexible belts
2. They contain five idlers
3. Depth of trough decreases with increasing number of idlers
4. Flexibility of belt increases as depth of trough decreases
a. 1 and 2
b. 2 and 3
c. 3 and 4
d. None of the above
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27) Which belt conveyor prevents sliding down of material at an inclination of 55o with horizontal?
a. Flat belt conveyor
b. Troughed belt conveyor
c. Blanket belt conveyor
d. Woven wire belt conveyors
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28) What are bulk loads?
a. Lump of material
b. Single rigid mass
c. Homogeneous particles
d. Heterogeneous particles
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29) Which of the following is not a hoisting equipment with lifting gear?
a. Cage elevators
b. Jib cranes
c. Pulleys
d. Troughed belts
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30) Which of the following is a property of bulk load?
a. Hardness
b. Cake forming tendency
c. Suspension part
d. Weight
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31) What are the factors affecting selection of casting process?
a. Tolerances
b. Surface finish
c. Both a. and b.
d. None of the above
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32) In forging process, forging plane is the plane __________
a. parallel to die motion
b. perpendicular to die motion
c. where two die halves meet
d. none of the above
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33) Which of the following processes is used for surface finishing?
a. Shaping
b. Broaching
c. Lapping
d. All of the above
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34) Which of the following statements is/are true about safety/risk?
a. Risk is potential for damage
b. Hazard is likely hood of damage
c. Danger is combination of risk and hazard
d. All of the above
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35) Which of the following ergonomic factors are encountered in engineering applications?
a. Thermal radiations
b. Lubrication failure
c. Fatigue
d. Corrosion
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