McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
The gears on camshaft and crankshaft are known as |
| A. | lining gears |
| B. | aligning gears |
| C. | timing gears |
| D. | tuning gears |
| Answer» C. timing gears | |
| Explanation: these gears are called timing gears. | |
| 102. |
The material known as high carbon high copper chrome silicon cast steel is used for making |
| A. | camshaft |
| B. | cylinder body |
| C. | cylinder head |
| D. | piston |
| Answer» A. camshaft | |
| Explanation: material used for making camshafts is high carbon high copper chrome silicon cast steel. | |
| 103. |
Camshaft gear is made from which material |
| A. | cast iron |
| B. | mild steel |
| C. | bakelite |
| D. | brass |
| Answer» C. bakelite | |
| Explanation: camshaft gears are made from bakelite. | |
| 104. |
The main reasons for crankshaft wear are |
| A. | different loads at some points of rotation |
| B. | centrifugal forces due to crankshaft rotation |
| C. | misalignment in connecting rod |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the three are the reasons for crankshaft wear. | |
| 105. |
The main causes of crankshaft vibration are |
| A. | variation in torque |
| B. | cyclic variation of gas and combustion products |
| C. | unbalanced weight of parts |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: crankshaft vibration is caused by all the above mentioned causes. | |
| 106. |
In the cam, the distance between the base circle and the nose is called |
| A. | lift |
| B. | lobe |
| C. | flank |
| D. | pitch |
| Answer» A. lift | |
| Explanation: distance between the base circle and nose is called lift of cam. | |
| 107. |
The crankshaft rotates the camshaft using |
| A. | belt drive |
| B. | chain drive |
| C. | gear drive |
| D. | motor drive |
| Answer» B. chain drive | |
| Explanation: chain drive is used to connect | |
| 108. |
The crankshaft should be inspected for |
| A. | cracks |
| B. | alignment of crankpins and journals |
| C. | cleanliness of oil gallaries |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: crankshaft should be inspected for all the above mentioned faults. | |
| 109. |
A radial bearing supports the load that acts along the axis of the shaft. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: radial bearing supports the load acting perpendicular to the axis of the shaft. | |
| 110. |
Sliding contact bearings, also called plain bearings have no problem of wear. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: surface of shaft slide over surface of the bush resulting in friction and wear. | |
| 111. |
Which of the following are true about plasticity? |
| A. | permanent deformation |
| B. | ability to retain deformation under load or after removal of load |
| C. | plastic deformation is greater than elastic deformation |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: this is the basic definition of plasticity. | |
| 112. |
Modulus of resilience is defined as |
| A. | strain energy per unit volume |
| B. | strain energy per unit area |
| C. | independent of strain energy |
| D. | none of the mentioned |
| Answer» A. strain energy per unit volume | |
| Explanation: modulus of resilience is strain energy per unit volume. | |
| 113. |
In gear boxes and small size motors, rolling contact bearings are used. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in small size applications, rolling contact bearings are preferred. | |
| 114. |
There is problem of alignment in deep groove ball bearings. |
| A. | yes |
| B. | no, it is self-aligning |
| C. | it aligns itself only in some particular cases |
| D. | can’t be determined |
| Answer» A. yes | |
| Explanation: it is not self-aligning. | |
| 115. |
Deep groove ball bearing has immense rigidity. |
| A. | true |
| B. | no it has point contact and hence low rigidity |
| C. | it has surface contact |
| D. | it has line contact |
| Answer» B. no it has point contact and hence low rigidity | |
| Explanation: due to point contact, rigidity is not so good. | |
| 116. |
Cylindrical load bearing has lower load capacity as compared to deep groove ball bearing. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: cylindrical load bearing has a line contact and hence higher load capacity. | |
| 117. |
Angular contact bearing can take thrust as well as radial loads. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: the line of reaction at the contact surfaces makes an angle with axis of bearing and thus has two components, hence allowing it to take both type of loads. | |
| 118. |
The angular play bearing must be mounted without axial play. |
| A. | yes |
| B. | little tolerance is adjusted |
| C. | little tolerance is necessary |
| D. | can’t be stated |
| Answer» A. yes | |
| Explanation: there is no tolerance of misalignment. | |
| 119. |
Taper rolling supports |
| A. | axial loads |
| B. | thrust loads |
| C. | both axial and thrust loads |
| D. | none of the mentioned |
| Answer» C. both axial and thrust loads | |
| Explanation: the line of reaction makes an angle with the axis of bearing and hence both type of loads can be carried. | |
| 120. |
Which of the following cannot tolerate misalignment? |
| A. | angular contact bearing |
| B. | cylinder roller bearing |
| C. | thrust ball bearings |
| D. | all of the listed |
| Answer» D. all of the listed | |
| Explanation: all of these require précised alignment. | |
| 121. |
Cylinder roller creates lesser noise than deep groove ball bearing. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: due to line contact, cylinder roller creates far more noise. | |
| 122. |
Straight bevel gears are easy to design and manufacture and give reasonably good service with quieter operation. |
| A. | true |
| B. | no, noise problem |
| C. | no, vibration problem |
| D. | none of the listed |
| Answer» B. no, noise problem | |
| Explanation: they produce a lot of noise while working. | |
| 123. |
Which of the following creates smoother motion? |
| A. | straight bevel gears |
| B. | spiral bevel gears |
| C. | equal for straight and spiral |
| D. | none of the mentioned |
| Answer» B. spiral bevel gears | |
| Explanation: spiral bevel gear has smooth engagement which results in quieter operation. | |
| 124. |
When the pitch angle is greater than 90⁰, it is called external bevel gear. |
| A. | true |
| B. | internal |
| C. | helical |
| D. | herringbone |
| Answer» B. internal | |
| Explanation: for external bevel gear, pitch angle is less than 90⁰. | |
| 125. |
If pitch angle is >90, the bevel gear is? |
| A. | internal |
| B. | external |
| C. | crown |
| D. | static |
| Answer» A. internal | |
| Explanation: nomenclature. | |
| 126. |
Crown gears having a pitch angle of 90⁰ |
| A. | =90 |
| B. | <90 |
| C. | >90 |
| D. | none of the listed |
| Answer» C. >90 | |
| Explanation: application of crown gear according to its structure. | |
| 127. |
Which of the following are characteristics of skew bevel gears? |
| A. | straight teeth |
| B. | mounted on parallel shafts |
| C. | mounted on intersecting shafts |
| D. | all of the mentioned |
| Answer» A. straight teeth | |
| Explanation: they are used in non-parallel and non-intersecting shafts. | |
| 128. |
Hypoid gears are based on surfaces that are paraboloids of revolution. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: they are hyperboloids of revolution. | |
| 129. |
When two hyperboloids are rotated, the resulting motion is |
| A. | sliding |
| B. | turning |
| C. | combination of turning and sliding |
| D. | rotary |
| Answer» C. combination of turning and sliding | |
| Explanation: there is turning as well as sliding motion. | |
| 130. |
Zerol gears are straight bevel gears with zero spiral angle. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: they happen to fall in the category of spiral bevel gears. | |
| 131. |
Zerol gears give lesser contact ratio. |
| A. | true |
| B. | no, larger contact ratio |
| C. | zero contact |
| D. | none of the listed |
| Answer» B. no, larger contact ratio | |
| Explanation: zerol gears have more gradual contact and slighter larger contact ratio. | |
| 132. |
Hydrodynamic lubrication takes place in region? |
| A. | bc |
| B. | cd |
| C. | both bc and cd |
| D. | none of the mentioned |
| Answer» B. cd | |
| Explanation: in cd thick film of lubrication has developed. | |
| 133. |
Coefficient of friction is minimum at |
| A. | it is same at each point |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| Explanation: it is minimum at the transition zone. | |
| 134. |
Bearing modulus is the bearing characteristic number at |
| A. | b |
| B. | c |
| C. | d |
| D. | none of the listed |
| Answer» B. c | |
| Explanation: bcn modulus is the the bcn number corresponding to the minimum coefficient of friction. | |
| 135. |
If viscosity of the lubricant is very low than BCN will lie in the region |
| A. | bc |
| B. | point c |
| C. | cd |
| D. | can’t be determined |
| Answer» A. bc | |
| Explanation: due to low viscosity, lubricant will not separate the two surfaces resulting in partial contact. | |
| 136. |
The fundamental equation for viscous flow is given by ∆pbhᵌ/6µl where symbols have their usual meanings. |
| A. | 6 is to be replaced by 3 |
| B. | 6 is to be replaced by 12 |
| C. | 6 is to be replaced by 9 |
| D. | 6 is to be replaced by 15 |
| Answer» B. 6 is to be replaced by 12 | |
| Explanation: it is givenby ∆pbhᵌ/12µl. | |
| 137. |
A single transverse weld is preferred over |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: a single transverse weld is not preferred because the edge of the plate which is not welded can warp out of shape. | |
| 138. |
Transverse fillet weld can be designed using the same equations as of parallel fillet weld. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: vice versa is true as strength of transverse fillet weld is greater than that of parallel fillet weld. | |
| 139. |
Which of the following are functions of bearings? |
| A. | ensure free rotation of shaft with minimum friction |
| B. | holding shaft in a correct position |
| C. | transmit the force of the shaft to the frame |
| D. | all of the listed |
| Answer» D. all of the listed | |
| Explanation: bearings are used for all the above listed purposes. | |
| 140. |
Which of the following is measure of stiffness? |
| A. | modulus of elasticity |
| B. | modulus of plasticity |
| C. | resilience |
| D. | toughness |
| Answer» A. modulus of elasticity | |
| Explanation: stiffness is the ability of material to resist deformation under external load. hence it is measured by modulus of elasticity. | |
| 141. |
Which of the following facts are true for resilience? |
| A. | ability of material to absorb energy when deformed elastically |
| B. | ability to retain deformation under the application of load or after removal of load |
| C. | ability of material to absorb energy when deformed plastically |
| D. | none of the mentioned |
| Answer» A. ability of material to absorb energy when deformed elastically | |
| Explanation: toughness is ability to store energy till proportional limit during deformation and to release this energy when unloaded. | |
| 142. |
Shot blasting process improves the endurance limit of the component. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 143. |
While designing a forging, the profile is selected such that the fibrous lines are parallel to the tensile forces and perpendicular to shear forces. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 144. |
What is the expression of the bending equation? |
| A. | m/i = σ/y = e/r |
| B. | m/r = σ/y = e/i |
| C. | m/y = σ/r = e/i |
| D. | m/i = σ/r = e/y |
| Answer» A. m/i = σ/y = e/r | |
| 145. |
The bending stress is |
| A. | directly proportional to the distance of layer from the neutral layer |
| B. | inversely proportional to the distance of layer from the neutral layer |
| C. | directly proportional to the neutral layer |
| D. | does not depend on the distance of layer from the neutral layer |
| Answer» A. directly proportional to the distance of layer from the neutral layer | |
| 146. |
The critical value at which crack extension occurs is called |
| A. | stress intensity factor |
| B. | toughness |
| C. | fracture toughness |
| D. | none of the mentioned |
| Answer» C. fracture toughness | |
| 147. |
If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load. |
| A. | 97.3 |
| B. | 95.8 |
| C. | 100.6 |
| D. | none of the mentioned |
| Answer» C. 100.6 | |
| 148. |
Which of the following can be the factor of safety for a dead load? |
| A. | 6 |
| B. | 2 |
| C. | 4 |
| D. | 7 |
| Answer» C. 4 | |
| 149. |
For which of the following design factor of safety the design will work properly? |
| A. | 0.1 |
| B. | 1 |
| C. | 2 |
| D. | 0.9 |
| Answer» C. 2 | |
| 150. |
While designing shaft on the basis of torsional rigidity, angle of twist is given by? |
| A. | ml/gd⁴ |
| B. | 584ml/gd⁴ |
| C. | 292 ml/gd⁴ |
| D. | none of the mentioned |
| Answer» B. 584ml/gd⁴ | |
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