MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering (MCQ) questions and answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 |
| Answer» C. 70 mm | |
| 2. |
The ratio of d / tfor thick cylinder is__________(whered = inner diameter, t = wall thickness) |
| A. | greater than 20 |
| B. | less than 20 |
| C. | equal to 20 |
| D. | none of the above |
| Answer» C. equal to 20 | |
| 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? ( = 100 N/mm & poisson's ratio = 0.3) |
| A. | 11 mm |
| B. | 15.36 mm |
| C. | 22.32 mm |
| D. | 80 mm |
| Answer» B. 15.36 mm | |
| 4. |
Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm to 1.5 N/mm? |
| A. | Plain formed head |
| B. | Torispherical dished head |
| C. | Semi-elliptical dished head |
| D. | All of the above |
| Answer» C. Semi-elliptical dished head | |
| 5. |
A piston has allowable tensile stress of 50 N/mm and has bore diameter 150 mm. Considering strength of piston, what will be the thickness of piston head if maximum pressure of 10 N/mm acts on it? |
| A. | 29 mm |
| B. | 35 mm |
| C. | 53 mm |
| D. | Insufficient data |
| Answer» B. 35 mm | |
| 6. |
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/mm? ( Bore diameter = 50 mm & P =15 N/mm) |
| A. | 10 mm |
| B. | 20 mm |
| C. | 30 mm |
| D. | Insufficient data |
| Answer» C. 30 mm | |
| 7. |
Failure rate for safety valve working for 400 hours is 3 x 10 failures/hour. What is the reliability of safety valve? |
| A. | 0.998 |
| B. | 0.989 |
| C. | 0.888 |
| D. | 0.899 |
| Answer» B. 0.989 | |
| 8. |
A cylindrical pressure vessel is subjected to an internal pressure of 3 Mpa on internal diameter of 1000 mm. The vessel is fabricated with single weld butt joint with back strip and is not radio-graphed. What is the thickness of flat head, if head made of alloy steel has an ultimate tensile strength of 400 N/mm ? (corrosion allowance = 2) |
| A. | 110 mm |
| B. | 120 mm |
| C. | 150.23 mm |
| D. | 152.13 mm |
| Answer» B. 120 mm | |
| 9. |
A cylindrical pressure vessel is subjected to operating pressure of 0.55 Mpa and corrosion allowance of 2. What is the thickness of pressure vessel shell if its internal diameter is 2000 mm? ( = 120 N/mm & = 0.75) |
| A. | 6.5 mm |
| B. | 7 mm |
| C. | 9 mm |
| D. | 9.5 mm |
| Answer» D. 9.5 mm | |
| 10. |
The limit equation s = S / Nis expressed as _________ |
| A. | loose limit equation |
| B. | rigid limit equation |
| C. | rigid on one side and loose on other side |
| D. | none of the above |
| Answer» C. rigid on one side and loose on other side | |
| 11. |
What does mean in Lagrange's equation (LE = U + )? |
| A. | Lagrange's multipliers |
| B. | Functional constraints |
| C. | Multiple variable objective |
| D. | None of the above |
| Answer» C. Multiple variable objective | |
| 12. |
What is the standard deviation of clearance population for the diameter of shaft and hole assembly specified below?Shaft diameter = 30 0.15Hole diameter = 30.5 0.25 |
| A. | 0.097 mm |
| B. | 0.059 mm |
| C. | 0.036 mm |
| D. | 0.390 mm |
| Answer» B. 0.059 mm | |
| 13. |
What is meant by hazard rate? |
| A. | Number of failures per unit time per number of items when exposed for same time |
| B. | Probability of test specimen fails between time t |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 14. |
What is the relation between standard deviation( ) and arithmetic mean ( ) to determine coefficient of variation (C)? |
| A. | C = + |
| B. | C = |
| C. | C = / |
| D. | C = x |
| Answer» D. C = x | |
| 15. |
Selection of welding process does not depend on ___________ |
| A. | thickness of material |
| B. | availability of equipments |
| C. | economics of the process |
| D. | none of the above |
| Answer» E. | |
| 16. |
What is the mass capacity of flat belt conveyor if volumetric capacity 0.55 m/hr? ( = 1500 kg/m) |
| A. | 825 tons/hr |
| B. | 825 kg/hr |
| C. | 2.727 tons/hr |
| D. | 2722 kg/hr |
| Answer» C. 2.727 tons/hr | |
| 17. |
Mass capacity of a conveyor is 200 ton/hr, if speed of the belt is 4 m/s then what is the width of horizontal flat belt conveyor carrying the load? (Surcharge factor = 0.075 & = 1000 kg/m) |
| A. | 499.23 mm |
| B. | 500.0 mm |
| C. | 533.7 mm |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 18. |
Which belt conveyor prevents sliding down of material at an inclination of 55 with horizontal? |
| A. | Flat belt conveyor |
| B. | Troughed belt conveyor |
| C. | Blanket belt conveyor |
| D. | Woven wire belt conveyors |
| Answer» D. Woven wire belt conveyors | |
| 19. |
Which of the following statements is false for troughed belt conveyors?1. Troughed belt conveyors use flexible belts2. They contain five idlers3. 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 |
| Answer» D. None of the above | |