MCQOPTIONS
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MCQOPTIONS
This section includes 59 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Metrology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following option is true for given statements about gear measurement?Statement 1: There is no effect of cutter accuracy on the accuracy of gear.Statement 2: Accuracy of individual elements is necessary for precision gears. |
| A. | T, F |
| B. | F, F |
| C. | T, T |
| D. | F, T |
| Answer» E. | |
| 2. |
Which of the following option is correct for given statements about gear measurement?Statement 1: Improper alignment of each teeth will cause high bearing stresses.Statement 2: Gear blank should be tested for dimensional accuracy. |
| A. | T, F |
| B. | F, F |
| C. | F, T |
| D. | T, T |
| Answer» E. | |
| 3. |
A module is expressed in- |
| A. | mm |
| B. | mm2 |
| C. | mm/number of teeth |
| D. | Dimensionless |
| Answer» B. mm2 | |
| 4. |
Bevel gears having equal number of teeth and equal pitch angles connect two orthogonally intersecting shafts. This system of gears is known as |
| A. | Crown gears |
| B. | Hypoid gears |
| C. | Worm gears |
| D. | Mitre gears |
| Answer» E. | |
| 5. |
A gear of 28 cm pitch circle diameter has 40 teeth. The circular pitch will nearly be |
| A. | 11 mm/tooth |
| B. | 22 mm/tooth |
| C. | 33 mm/tooth |
| D. | 44 mm/tooth |
| Answer» C. 33 mm/tooth | |
| 6. |
One tooth of a gear having 4 module and 32 teeth is shown in the figure. Assume that the gear tooth and the corresponding tooth space make equal intercepts on the pitch circumference. The dimensions ‘a’ and ‘b’, respectively, are closest to |
| A. | 6.08 mm, 4 mm |
| B. | 6.48 mm, 4.2 mm |
| C. | 6.28 mm, 4.3 mm |
| D. | 6.28 mm, 4.1 mm |
| Answer» E. | |
| 7. |
Any gear base circle diameter is equal to [where D is the pitch circle diameter. |
| A. | D × tan ϕ |
| B. | D × cos ϕ |
| C. | D × sin ϕ |
| D. | None of these |
| Answer» C. D × sin ϕ | |
| 8. |
In spur gears, the circle on which the involute is generated is called: |
| A. | base circle |
| B. | clearance angle |
| C. | pitch circle |
| D. | addendum circle |
| Answer» B. clearance angle | |
| 9. |
A pinion with radius r1, and inertia I1 is driving a gear with radius r2 and inertia I2. Torque τ1 is applied on pinion. The following are free body diagrams of pinion and gear showing important forces (F1 and F2) of interaction. Which of the following relations hold true? |
| A. | \({F_1}\# {F_2};{\tau _1} = {I_1}{\theta _1};{F_2} = {I_2}\frac{{{I_1}}}{{r_2^2}}{\ddot \theta_1}\) |
| B. | \({F_1} = {F_2};{\tau _1} = \left[ {{I_1} + {I_2}{{\left( {\frac{{{r_1}}}{{{r_2}}}} \right)}^2}} \right]{\ddot \theta _1};{F_2} = {I_2}\frac{{{r_1}}}{{r_2^2}}{\ddot \theta _1}\) |
| C. | \({F_1} = {F_2};{\tau _1} = {I_1}{\ddot \theta _1};{F_2} = {I_2}\frac{1}{{{r_2}}}{\ddot \theta _2}\) |
| D. | \({F_1}\# {F_2};{\tau _1} = \left[ {{I_1} + {I_2}{{\left( {\frac{{{r_1}}}{{{r_2}}}} \right)}^2}} \right]{\ddot \theta _1};{F_2} = {I_2}\frac{{{r_1}}}{{r_2^2}}{\ddot \theta _2}\) |
| Answer» C. \({F_1} = {F_2};{\tau _1} = {I_1}{\ddot \theta _1};{F_2} = {I_2}\frac{1}{{{r_2}}}{\ddot \theta _2}\) | |
| 10. |
Mitre gears are generally used for _____ |
| A. | minimum axial thrust |
| B. | change in direction without effecting speed |
| C. | minimum backlash |
| D. | speed reduction |
| Answer» C. minimum backlash | |
| 11. |
In spur gears, the profile is |
| A. | Surface of top of tooth |
| B. | Curve forming face and flank |
| C. | Part of tooth surface below pitch surface |
| D. | Circular Shape |
| Answer» C. Part of tooth surface below pitch surface | |
| 12. |
In metric standard, the reciprocal of the diametrical pitch of spur gear is described as |
| A. | Addendum |
| B. | Dedendum |
| C. | Module |
| D. | Backlash |
| Answer» D. Backlash | |
| 13. |
Axial thrust has a significant effect in case of which of the following gear? |
| A. | Spur gear |
| B. | Helical gear |
| C. | Double helical gear |
| D. | Herringbone gear |
| Answer» C. Double helical gear | |
| 14. |
Consider the following statements regarding gear tooth designing for gear drive:1. Tooth profiles not designed as per ‘law of gearing’ will cause vibration and impact problems even at low speed.2. As the gears go through their mesh, the pitch point must remain stationary on the line of centres.3. In a correctly designed tooth profile, the line of action of successive instantaneous points of contact will pass through the stationary pitch point.Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 2 only | |
| 15. |
A spur is designed to transmit the power 10 kW at a pitch line velocity of 10 m/s. Diameter of driving gear is 1 m. The tangential force between the driver and the follower and the transmitted torque, respectively, are: |
| A. | 1 kN and 0.5 kNm |
| B. | 0.5 kN and 1 kNm |
| C. | 0.5 kN and 0.5 kNm |
| D. | 1 kN and 1 kNm |
| Answer» B. 0.5 kN and 1 kNm | |
| 16. |
For standard addendum, the minimum number of teeth for an involute rack and pinion arrangement for pressure angle of 20° is: |
| A. | 18 |
| B. | 24 |
| C. | 22 |
| D. | 28 |
| Answer» B. 24 | |
| 17. |
Large speed reductions (greater than 20) in one state of a gear train are possible through |
| A. | Spur gearing |
| B. | Worm gearing |
| C. | Bevel gearing |
| D. | Helical gearing |
| Answer» C. Bevel gearing | |
| 18. |
Consider the following statements:In case of helical gears, teeth are cut at an angle to the axis of rotation of the gears.1) Helix angle introduces another ratio called axial contact ratio.2) Transverse contact ratio is equal to axial contact ratio in helical gears.3) Large transverse contact ratio does not allow multiple teeth to share the load.4) Large axial contact ratio will cause larger axial force componentWhich of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 4 |
| D. | 3 and 4 |
| Answer» D. 3 and 4 | |
| 19. |
In which one of the following tooth profiles, does the pressure angle remain constant throughout the engagement of teeth? |
| A. | Cycloidal |
| B. | Involute |
| C. | Conjugate |
| D. | Epicycloid |
| Answer» C. Conjugate | |
| 20. |
A 2 kW motor is running at 1440 rpm. It is connected to be stirrer running at 36 rpm. The gearing arrangement is suitable for this application is |
| A. | Differential Gear |
| B. | Helical Gear |
| C. | Spur Gear |
| D. | Worm Gear |
| Answer» E. | |
| 21. |
Meander drive is a _____ shaft mechanism. |
| A. | Four |
| B. | One |
| C. | Three |
| D. | Two |
| Answer» D. Two | |
| 22. |
For the given statements:I. Mating spur gear teeth is an example of higher pairII. A revolute joint is an example of lower pairIndicate the correct answer. |
| A. | Both I and II are false |
| B. | I is true and II is false |
| C. | I is false and II is true |
| D. | Both I and II are true |
| Answer» E. | |
| 23. |
Pitch diameter is equal to the product of |
| A. | Circular pitch and number of teeth |
| B. | Working depth and number of teeth |
| C. | Clearance and number of teeth |
| D. | Module and number of teeth |
| Answer» E. | |
| 24. |
Pressure angle of involute gears does not exceed 25°, since |
| A. | this will lead to unwanted radial force |
| B. | the number of teeth to avoid undercutting will be very high |
| C. | no cutters are available |
| D. | gears will become too small |
| Answer» B. the number of teeth to avoid undercutting will be very high | |
| 25. |
A spur gear has the following specification:No of teeth = 22Pitch circle diameter = 14 mmFind out the value of circular pitch. |
| A. | 2 mm |
| B. | 16 mm |
| C. | 4 mm |
| D. | 8 mm |
| Answer» B. 16 mm | |
| 26. |
Profile of a gear tooth can be checked by: |
| A. | Sine bar |
| B. | Optical pyrometer |
| C. | Optical projector |
| D. | Slip gauges |
| Answer» D. Slip gauges | |
| 27. |
“Addendum” is defined as |
| A. | The radius of addendum circle |
| B. | The radial height of the tooth below the pitch circle |
| C. | The radial height of the tooth above the pitch circle |
| D. | It is the full depth of the tooth |
| Answer» D. It is the full depth of the tooth | |
| 28. |
If a spur gear has module of 4 mm, its circular pitch will be given by |
| A. | 2 mm |
| B. | 3 mm |
| C. | 6.28 mm |
| D. | 12.56 mm |
| Answer» E. | |
| 29. |
In double helical gear the helix angle is |
| A. | 90° |
| B. | 45° |
| C. | 75° |
| D. | 60° |
| Answer» C. 75° | |
| 30. |
A pair of spur gears with 20° full-depth involute teeth is used to transmit 3.5 kW of power. The pinion rotates at 700 rpm and has a pitch circle diameter of 100 mm. Assuming a single pair of teeth in contact, the total force acting on a gear tooth (in kN) is |
| A. | 0.347 |
| B. | 0.954 |
| C. | 1.016 |
| D. | 1.302 |
| Answer» D. 1.302 | |
| 31. |
A helical gear with 20° pressure angle and 30° helix angle mounted at the midspan of a shaft that is supported between two bearings at the ends. The nature of the stresses induced in the shaft is |
| A. | normal stresses due to bending only |
| B. | normal stress due to bending in one plane and axial loading; shear stress due to torsion |
| C. | Normal stress due to bending in two planes and axial loading; shear stress due to torsion |
| D. | normal stress due to bending in two planes; shear stress due to torsion |
| Answer» D. normal stress due to bending in two planes; shear stress due to torsion | |
| 32. |
Match the following related to gearsA. Spur gears1. Transmit motion between non-parallel and non-intersecting shaftsB. Helical gears2. Transmit motion between parallel shaftsC. Worm gears3. Transmit motion between intersecting shafts D. Bevel gears4. Transmit motion between parallel shafts or non-parallel |
| A. | A – 2, B – 3, C – 4, D - 1 |
| B. | A – 3, B – 4, C – 1, D - 2 |
| C. | A – 2, B – 4, C – 1, D - 3 |
| D. | A – 3, B – 2, C – 1, D -4 |
| Answer» D. A – 3, B – 2, C – 1, D -4 | |
| 33. |
A spur gear has a module of 3.5 mm, length of path of contact of \(11\sqrt 3~ mm\) and pressure angle 30°. The contact ratio of the gear will be: |
| A. | 1.7 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» D. 1 | |
| 34. |
In skew bevel gears, the axes ______. |
| A. | are non – parallel and non – intersecting, and the teeth are curved |
| B. | are non – parallel and non – intersecting and the teeth are straight |
| C. | intersect, and the teeth are curved and oblique |
| D. | intersect, and the teeth are curved and can be ground |
| Answer» C. intersect, and the teeth are curved and oblique | |
| 35. |
Rack and pinion arrangement is used for: |
| A. | Linear motion to rotary motion |
| B. | Rotary motion to rotary motion |
| C. | Linear to linear motion |
| D. | Rotary to linear motion |
| Answer» E. | |
| 36. |
Addendum of a gear is equal to- |
| A. | Circular Pitch |
| B. | 0.3 CP |
| C. | 0.3183 CP |
| D. | 0.3683 CP |
| Answer» D. 0.3683 CP | |
| 37. |
Gears used for connecting intersecting shafts? |
| A. | Helical Gear |
| B. | Bevel Gear |
| C. | Spur gear |
| D. | Rack and pinion |
| Answer» C. Spur gear | |
| 38. |
Involute profile is preferred over cycloidal profile because |
| A. | The profile is easy to cut |
| B. | Only one curve is required to cut |
| C. | The races has a straight line profile and hence can be cut accurately |
| D. | It is universally accepted |
| Answer» C. The races has a straight line profile and hence can be cut accurately | |
| 39. |
It is desired to avoid interference in a pair of spur gears having a 20° pressure angle. With increase in pinion to gear speed ratio, the minimum number of teeth on the pinion |
| A. | increases |
| B. | decreases |
| C. | first increases and then decreases |
| D. | remains unchanged |
| Answer» C. first increases and then decreases | |
| 40. |
Consider the following statements:The axis of spiral bevel gear are non-parallel and intersecting.1) The most common pressure angle for spiral bevel gear is 20°2) The most common spiral angle for spiral bevel gear is 35.3) Spirals bevel gears are generally interchangeable.4) Spirals are noisy and recommended for low speeds of 10 m /s.Which of the above statements are correct? |
| A. | 1 and 4 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» C. 2 and 3 | |
| 41. |
For non-parallel non-intersecting shafts power can be transmitted with the help of |
| A. | Pair of helical gear |
| B. | Pair of spur gear |
| C. | Pair of spiral gear |
| D. | Oldham coupling |
| Answer» D. Oldham coupling | |
| 42. |
Match the type of gears with their most appropriate description. Type of gear DescriptionPHelical1Axes non parallel and non intersectingQSpiral Bevel2Axes parallel and teeth are inclined to the axisRHypoid3 Axes parallel and teeth are parallel to the axisSRack and pinion4Axes are perpendicular and intersecting, and teeth are inclined to the axis 5Axes are perpendicular and used for large speed reduction 6Axes parallel and one of the gears has infinite radius |
| A. | P – 2, Q – 4, R – 1, S – 6 |
| B. | P – 1, Q – 4, R – 5, S – 6 |
| C. | P – 2, Q – 6, R – 4, S – 2 |
| D. | P – 6, Q – 3, R – 1, S - 5 |
| Answer» B. P – 1, Q – 4, R – 5, S – 6 | |
| 43. |
A spur gear has pitch circle diameter D and number of teeth T. The circular pitch of the gear is |
| A. | \(\frac{{\pi D}}{T}\) |
| B. | \(\frac{T}{D}\) |
| C. | \(\frac{D}{T}\) |
| D. | \(\frac{2\pi D}{T}\) |
| Answer» B. \(\frac{T}{D}\) | |
| 44. |
Consider the following statements:In the case of involute gears in contact1. the motion is one of pure rolling2. pressure angle does not change during contact3. velocity ratio does not change4. output torque of the driven gear changesWhich of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» D. 3 and 4 | |
| 45. |
In a single reduction, a large velocity ratio is required. The best transmission is |
| A. | Spur gear drive |
| B. | Helical gear drive |
| C. | Worm gear drive |
| D. | Bevel gear drive |
| Answer» D. Bevel gear drive | |
| 46. |
From the start of the engagement to the end of the engagement, the pressure angle of gear, having an involute profile is: |
| A. | zero |
| B. | varies linearly |
| C. | varies exponentially |
| D. | constant |
| Answer» E. | |
| 47. |
If t and T are the number of teeth on pinion and gear, G is gear ratio, Ap is the fraction by which the standard addendum of one module is multiplied and ϕ is the pressure angle, the expression of the minimum number of teeth on the pinion to avoid interference when pinion and gear have an equal number of teeth is given as |
| A. | \(t = \frac{{2{A_p}}}{{\sqrt {1~- ~3\;Si{n^2}\phi } ~ +~ 1}}\) |
| B. | \(t = \frac{{2{A_p}}}{{\sqrt {1~ +~ 3\;Si{n^2}\phi } ~+ ~1}}\) |
| C. | \(t = \frac{{2{A_p}}}{{\sqrt {1~ -~ 3\;Si{n^2}\phi } ~ - ~1}}\) |
| D. | \(t = \frac{{2{A_p}}}{{\sqrt {1 ~+~ 3\;Si{n^2}\phi } ~-~ 1}}\) |
| Answer» E. | |
| 48. |
If the module of a gear is 10, then the circular pitch of the gear is: |
| A. | 31.4 |
| B. | 62.8 |
| C. | 314 |
| D. | 3.14 |
| Answer» B. 62.8 | |
| 49. |
A worm gear set is designed to have pressure angle of 30° which is equal to the helix angle. The efficiency of the worm gear set at an interface friction of 0.05 is |
| A. | 89.1% |
| B. | 77.9% |
| C. | 67.9% |
| D. | 57.9% |
| Answer» B. 77.9% | |
| 50. |
Operating pressure angle for involute gear teeth is |
| A. | Maximum at engagement of teeth |
| B. | Minimum at the engagement of teeth |
| C. | Same at all points of contact |
| D. | Vary uniformly at all points of contact |
| Answer» D. Vary uniformly at all points of contact | |