MCQOPTIONS
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MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by |
| A. | 0.5 mm upto rivet diameter of 24 mm |
| B. | 1 mm for rivet diameter from 27 mm to 36 mm |
| C. | 2 mm for rivet diameter from 39 mm to 48 mm |
| D. | all of the above |
| Answer» D. all of the above | |
| 102. |
When plates are fastened by a rivet, the holes in the plates should be made by punching and reaming. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 103. |
The stress in the threaded part of the bolt will be __________ as compared to the shank. |
| A. | same |
| B. | higher |
| C. | lower |
| Answer» C. lower | |
| 104. |
A shaft is a rotating machine element. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 105. |
The dedendum circle diameter is equal to (where φ = Pressure angle) |
| A. | pitch circle diameter x cos φ |
| B. | addendum circle diameter x cos φ |
| C. | clearance circle diameter x cos φ |
| D. | pitch circle diameter x sin φ |
| Answer» B. addendum circle diameter x cos φ | |
| 106. |
According to I.B.R., when the thickness of boiler shell () is greater than 8 mm, then the diameter of rivet hole () is obtained by |
| A. | equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | equating shearing resistance to the crushing resistance of the rivets |
| D. | none of the above |
| Answer» E. | |
| 107. |
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm. If the permissible tensile stress in the metal is 20 N/mm, then the thickness of the metal required for making the pipe will be |
| A. | 5 mm |
| B. | 10 mm |
| C. | 15 mm |
| D. | 25 mm |
| Answer» E. | |
| 108. |
A tangent key is provided in pairs at right angles and each key is to withstand torsion in one direction only. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 109. |
A shaft is subjected to a maximum bending stress of 80 N/mm and maximum shearing stress equal to 30 N/mm at a particular section. If the yield point in tension of the material is 280 N/mm and the maximum shear stress theory of failure is used, then the factor of safety obtained will be |
| A. | 2.5 |
| B. | 2.8 |
| C. | 3.0 |
| D. | 3.5 |
| Answer» C. 3.0 | |
| 110. |
The longitudinal stress is __________ of the circumferential stress. |
| A. | one-half |
| B. | two-third |
| C. | three-fourth |
| D. | double |
| Answer» B. two-third | |
| 111. |
The expression 0.175 - 0.841/ is the Lewis form factor for |
| A. | composite and full depth involute system |
| B. | 20° full depth involute system |
| C. | 20° stub system |
| D. | none of the above |
| Answer» D. none of the above | |
| 112. |
A steel containing more than 0.8% carbon is known as eutectoid steel. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 113. |
When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as |
| A. | spur gearing |
| B. | helical gearing |
| C. | bevel gearing |
| D. | spiral gearing |
| Answer» E. | |
| 114. |
When a nut is tightened by placing a washer below it, the bolt will be subjected to |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | none of these |
| Answer» B. compressive stress | |
| 115. |
When a load is suddenly applied to a bar of weight , the stress induced in the bar will increase with the increase in weight . |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 116. |
The endurance limit for a mirror polished material will be __________ as compared to unpolished material. |
| A. | same |
| B. | less |
| C. | more |
| Answer» D. | |
| 117. |
In a crossed belt drive, the shafts are arranged parallel and rotate in the same directions. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 118. |
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as |
| A. | helix angle |
| B. | pressure angle |
| C. | pitch lead angle |
| D. | none of these |
| Answer» B. pressure angle | |
| 119. |
Idler pulley is used for |
| A. | increasing velocity ratio |
| B. | for applying tension |
| C. | changing the direction of motion of belt |
| D. | all of these |
| Answer» C. changing the direction of motion of belt | |
| 120. |
Screws jacks have multiple threads. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 121. |
In an ordinary bolt, the effect of the impulsive loads applied axially is concentrated on the cross-sectional area at the root of the threads. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 122. |
The metal suitable for bearings subjected to light loads is |
| A. | silicon bronze |
| B. | white metal |
| C. | monel metal |
| D. | phosphor bronze |
| Answer» E. | |
| 123. |
A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 124. |
Which of the following is an antifriction bearing? |
| A. | journal bearing |
| B. | pedestal bearing |
| C. | collar bearing |
| D. | needle bearing |
| Answer» E. | |
| 125. |
A connecting rod is four times strong in buckling about Y-axis than about X-axis. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 126. |
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear. |
| A. | right hand |
| B. | left hand |
| Answer» C. | |
| 127. |
A connecting rod is designed as a |
| A. | long column |
| B. | short column |
| C. | strut |
| D. | all of these |
| Answer» D. all of these | |
| 128. |
The cross-section of the arm of a bell crank lever is |
| A. | rectangular |
| B. | elliptical |
| C. | I-section |
| D. | any one of these |
| Answer» E. | |
| 129. |
The rocker arms in internal combustion engines are of first type levers. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 130. |
The bell crank levers used in railway signalling arrangement are of third type levers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 131. |
When spring index increases, the value of Wahl's stress factor |
| A. | increases linearly |
| B. | decreases linearly |
| C. | remains same |
| D. | increases exponentially |
| Answer» E. | |
| 132. |
A screw will be self locking, if |
| A. | friction angle is less than helix angle |
| B. | friction angle is more than helix angle |
| C. | friction angle is equal to helix angle |
| D. | efficiency of screw is 100% |
| Answer» C. friction angle is equal to helix angle | |
| 133. |
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where = Nominal diameter of bolt) |
| A. | 0.5 |
| B. | 0.75 |
| C. | 1.25 |
| Answer» D. | |
| 134. |
The module in the reciprocal of diametral pitch. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 135. |
The velocity factor for carefully cut gears operating at velocities upto __________ is equal to 4.5/4.5 + . |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» C. 15 m/s | |
| 136. |
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is |
| A. | bending stress only |
| B. | a combination of torsional shear stress and bending |
| C. | direct shear stress only |
| D. | a combination of bending stress and direct shear stress |
| Answer» B. a combination of torsional shear stress and bending | |
| 137. |
In radial bearings, the load acts __________ to the axis of rotation. |
| A. | parallel |
| B. | perpendicular |
| Answer» C. | |
| 138. |
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have |
| A. | right hand threads |
| B. | left hand threads |
| C. | multiple threads |
| D. | pointed threads |
| Answer» B. left hand threads | |
| 139. |
When a cylinder is subjected to a very high internal fluid pressure, the thin cylinder should be used. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 140. |
The pitch diameter is the __________ diameter of an external or internal screw thread. |
| A. | effective |
| B. | smallest |
| C. | largest |
| Answer» B. smallest | |
| 141. |
The surface finish factor for a mirror polished material is |
| A. | 0.45 |
| B. | 0.65 |
| C. | 0.85 |
| D. | 1 |
| Answer» E. | |
| 142. |
The yield point in static loading is __________ as compared to fatigue loading. |
| A. | higher |
| B. | lower |
| C. | same |
| Answer» B. lower | |
| 143. |
A single strap butt joint is always in __________ shear. |
| A. | single |
| B. | double |
| Answer» B. double | |
| 144. |
A shoe brake is commonly used in railway trains. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 145. |
The minor diameter of a screw thread is also known as outside or nominal diameter. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 146. |
The effective stress in wire ropes during normal working is equal to the stress due to |
| A. | axial load plus stress due to bending |
| B. | acceleration/retardation of masses plus stress due to bending |
| C. | axial load plus stress due to acceleration/retardation |
| D. | bending plus stress due to acceleration/retardation |
| Answer» B. acceleration/retardation of masses plus stress due to bending | |
| 147. |
In a sawn nut, a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 148. |
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves |
| A. | axially upwards |
| B. | axially downwards |
| C. | axially upwards or downwards |
| D. | none of these |
| Answer» D. none of these | |
| 149. |
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ . The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be |
| A. | τ/2 |
| B. | τ |
| C. | 2 τ |
| D. | 4 τ |
| Answer» C. 2 τ | |
| 150. |
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used. |
| A. | rectangular |
| B. | square |
| C. | parallel |
| Answer» D. | |