MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the |
| A. | tip of the pinion and flank of gear |
| B. | flanks of both gear and pinion |
| C. | tip of the gear and flank of pinion |
| D. | tip of both gear and pinion |
| Answer» D. tip of both gear and pinion | |
| 2. |
When the speed of belt increases, |
| A. | the coefficient of friction between the belt and pulley increases |
| B. | the power transmitted will increase |
| C. | the coefficient of friction between the belt and pulley decreases |
| D. | the power transmitted will decrease |
| Answer» E. | |
| 3. |
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that |
| A. | it is subjected to a higher stress than the outer side |
| B. | it is more stretched than the outer side during the manufacturing process |
| C. | it is subjected to a higher cyclic loading than the outer side |
| D. | it has a lower curvature than the outer side |
| Answer» D. it has a lower curvature than the outer side | |
| 4. |
In a marine flange coupling, the thickness of flange is taken as |
| A. | 3 d/4 |
| B. | d/3 |
| C. | d/2 |
| D. | d/4 |
| Answer» C. d/2 | |
| 5. |
The included angle for the British Association thread is |
| A. | 47.3° |
| B. | 55° |
| C. | 29° |
| D. | 60° |
| Answer» C. 29° | |
| 6. |
The contact ratio is the ratio of |
| A. | length of path of contact to the circular pitch |
| B. | length of arc of contact to the circular pitch |
| C. | length of arc of approach to the circular pitch |
| D. | length of arc of recess to the circular pitch |
| Answer» C. length of arc of approach to the circular pitch | |
| 7. |
The period during which the cam follower remains at rest, when cam moves, is known as |
| A. | idle period |
| B. | fixed period |
| C. | constant period |
| D. | dwell period |
| Answer» E. | |
| 8. |
A machine part subjected to __________ is called a strut. |
| A. | an axial tensile force |
| B. | an axial compressive force |
| C. | any one of these |
| D. | pitch circle diameter x sin ? |
| Answer» D. pitch circle diameter x sin ? | |
| 9. |
When two helical springs of equal lengths are arranged to form a cluster spring, then |
| A. | load taken by each spring will be half the total load |
| B. | all of the above |
| C. | none of these |
| D. | shear stress in each spring will be equal |
| Answer» C. none of these | |
| 10. |
The standard length of the shaft is |
| A. | 5 m |
| B. | all of these |
| C. | 7 m |
| D. | 6 m |
| Answer» C. 7 m | |
| 11. |
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be |
| A. | 6 |
| B. | 8 |
| C. | 4 |
| D. | 10 |
| Answer» C. 4 | |
| 12. |
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by |
| A. | equating tearing resistance of the plate to the crushing resistance of the rivets |
| B. | equating tearing resistance of the plate to the shearing resistance of the rivets |
| C. | equating shearing resistance to the crushing resistance of the rivets |
| D. | none of the above |
| Answer» E. | |
| 13. |
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will |
| A. | move towards right of the bearing making no metal to metal contact |
| B. | have contact at the bottom most of the bearing |
| C. | move towards right of the bearing making the metal to metal contact |
| D. | move towards left of the bearing making metal to metal contact |
| Answer» E. | |
| 14. |
The radial distance of a tooth from the pitch circle to the top of the tooth is called |
| A. | clearance |
| B. | dedendum |
| C. | working depth |
| D. | addendum |
| Answer» E. | |
| 15. |
The ratio of endurance limit in shear to the endurance limit in flexure is |
| A. | 0.25 |
| B. | 0.55 |
| C. | 0.7 |
| D. | 0.4 |
| Answer» C. 0.7 | |
| 16. |
A sliding bearing which operates without any lubricant present, is called |
| A. | zero film bearing |
| B. | hydrostatic lubricated bearing |
| C. | boundary lubricated bearing |
| D. | hydrodynamic lubricated bearing |
| Answer» B. hydrostatic lubricated bearing | |
| 17. |
If a bearing is designated by the number 305, it means that the bearing is of |
| A. | light series whose bore is 5 mm |
| B. | light series whose bore is 25 mm |
| C. | medium series whose bore is 5 mm |
| D. | medium series whose bore is 25 mm |
| Answer» E. | |
| 18. |
In order to remove internal stresses produced by hardening the steel, the process usually adopted is |
| A. | annealing |
| B. | normalising |
| C. | spheroidising |
| D. | tempering |
| Answer» E. | |
| 19. |
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called |
| A. | working depth |
| B. | face width |
| C. | clearance |
| D. | backlash |
| Answer» E. | |
| 20. |
In a gear, having involute teeth, the normal to the involute is a tangent to the |
| A. | pitch circle |
| B. | base circle |
| C. | addendum circle |
| D. | dedendum circle |
| Answer» C. addendum circle | |
| 21. |
The rivet head used for boiler plate riveting is usually |
| A. | conical head |
| B. | pan head |
| C. | counter sunk head |
| D. | snap head |
| Answer» E. | |
| 22. |
The velocity factor for carefully cut gears operating at velocities upto __________ is equal to 4.5/4.5 + v. |
| A. | 15 m/s |
| B. | 20 m/s |
| C. | 10 m/s |
| D. | 12.5 m/s |
| Answer» E. | |
| 23. |
An universal coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» E. | |
| 24. |
18/8 steel contains |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 8% vanadium |
| D. | 18% vanadium and 8% nickel |
| Answer» C. 18% nickel and 8% vanadium | |
| 25. |
A localised compressive stress at the area of contact between two members is known as |
| A. | tensile stress |
| B. | bending stress |
| C. | shear stress |
| D. | bearing stress |
| Answer» E. | |
| 26. |
The metal suitable for bearings subjected to heavy loads is |
| A. | silicon bronze |
| B. | phosphor bronze |
| C. | white metal |
| D. | monel metal |
| Answer» D. monel metal | |
| 27. |
The lower deviation is the algebraic difference between the |
| A. | maximum limit and the basic size |
| B. | actual size and the corresponding basic size |
| C. | none of the above |
| D. | minimum limit and the basic size |
| Answer» E. | |
| 28. |
For hardening alloy steels and high speed steels, they are heated to |
| A. | 500 to 600°C |
| B. | 700 to 900°C |
| C. | 1100 to 1300°C |
| D. | 1300 to 1500°C |
| Answer» D. 1300 to 1500°C | |
| 29. |
Euler's formula for a mild steel column is not valid if the slenderness ratio is |
| A. | 90 |
| B. | 60 |
| C. | 100 |
| D. | 120 |
| Answer» C. 100 | |
| 30. |
In leaf springs, the longest leaf is known as |
| A. | master leaf |
| B. | none of these |
| C. | lower leaf |
| D. | upper leaf |
| Answer» B. none of these | |
| 31. |
The rolling contact bearings as compared to sliding contact bearings have |
| A. | accuracy of shaft alignment |
| B. | small overall dimensions |
| C. | low starting and low running friction except at very high speeds |
| D. | all of the above |
| Answer» E. | |
| 32. |
The taper on cotter varies from |
| A. | 1 in 32 to 1 in 24 |
| B. | 1 in 48 to 1 in 24 |
| C. | 1 in 24 to 1 in 20 |
| D. | 1 in l5 to 1 in 10 |
| Answer» C. 1 in 24 to 1 in 20 | |
| 33. |
Which of the following screw thread is used for power transmission in one direction only. |
| A. | Multiple threads |
| B. | Buttress threads |
| C. | Acme threads |
| D. | Square threads |
| Answer» C. Acme threads | |
| 34. |
The maximum normal stress theory is used for |
| A. | ductile materials |
| B. | non-ferrous materials |
| C. | brittle materials |
| D. | plastic materials |
| Answer» D. plastic materials | |
| 35. |
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be __________ the bearing modulus. |
| A. | 15 times |
| B. | 10 times |
| C. | 20 times |
| D. | 5 times |
| Answer» B. 10 times | |
| 36. |
The rolling contact bearings are known as |
| A. | thin lubricated bearings |
| B. | plastic bearings |
| C. | antifriction bearings |
| D. | thick lubricated bearings |
| Answer» D. thick lubricated bearings | |
| 37. |
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as |
| A. | angular bevel gears |
| B. | crown bevel gears |
| C. | internal bevel gears |
| D. | mitre gears |
| Answer» C. internal bevel gears | |