McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
If two gears having 24 and 96 teeth mesh each other, they must have been cut |
| A. | On same setting in a machine |
| B. | With same cutter |
| C. | With cutters of same moduic |
| D. | With the one cutter |
| E. | With cutter of same diameter as that of gear |
| Answer» C. With cutters of same moduic | |
| 102. |
The following type of mechanism is not possible in any framed structure as an independent mechanism |
| A. | Joint mechanism |
| B. | Increasing the diameter of threaded portion |
| C. | Cable mechanism |
| D. | Beam mechanism |
| E. | Panel (sway) mechanism |
| Answer» A. Joint mechanism | |
| 103. |
A solid shaft and a hollow shaft are to be of equal strength in torsion. The hollow shaft is to be 10% larger in diameter than the solid shaft. The ratio of the weight of the hollow shaft will be (both shafts being made of same material) |
| A. | 1.2 |
| B. | 0.47 |
| C. | 2 |
| D. | 0.6 |
| E. | 1 |
| Answer» C. 2 | |
| 104. |
The maximum size of the fillet weld that can be used is |
| A. | Increasing the diameter of threaded portion |
| B. | 3 mm |
| C. | 7 mm |
| D. | 1 mm |
| E. | 5 mm |
| Answer» B. 3 mm | |
| 105. |
Spring driven watches and clocks utilise |
| A. | Hypocycloid gears |
| B. | Epicycloid gears |
| C. | Involute gears |
| D. | Cycloid gears |
| E. | Any of the above |
| Answer» D. Cycloid gears | |
| 106. |
The shape or form factor is introduced in the design of compression members to represent the effect of |
| A. | Increasing the diameter of threaded portion |
| B. | vertical buckling |
| C. | local buckling |
| D. | diagonal buckling |
| E. | post buckling |
| Answer» C. local buckling | |
| 107. |
The plastic design of steel structures which is based on upper bound theorem is |
| A. | safe, unsafe |
| B. | Increasing the diameter of threaded portion |
| C. | unsafe, unsafe |
| D. | safe, safe |
| E. | unsafe, safe |
| Answer» E. unsafe, safe | |
| 108. |
Poisson's ratio for rubber is taken as |
| A. | 0.1 |
| B. | 1 |
| C. | Zero |
| D. | 2 |
| E. | 0.5 |
| Answer» E. 0.5 | |
| 109. |
In above problem the cone pitch angle of the pinion will be |
| A. | sin-1 2.0 |
| B. | cos-1 0.5 |
| C. | tan-1 0.5 |
| D. | sin-1 0.5 |
| E. | tan-1 2.0 |
| Answer» D. sin-1 0.5 | |
| 110. |
Cycloidal profile gears are used in |
| A. | Machine tools |
| B. | Automobiles |
| C. | Toys |
| D. | Watches and clocks |
| E. | Aircraft |
| Answer» D. Watches and clocks | |
| 111. |
The ratio of lateral strain to linear strain is |
| A. | Cast steel |
| B. | Stress ratio |
| C. | Factor of safety |
| D. | Poisson ratio |
| E. | Strain ratio |
| Answer» D. Poisson ratio | |
| 112. |
In case of worm and worm wheel drives, the axes of the two are |
| A. | parallel and intersecting |
| B. | non-parallel and intersecting |
| C. | parallel and non-intersecting |
| D. | non-parallel and non-intersecting |
| E. | Increasing the diameter of threaded portion |
| Answer» D. non-parallel and non-intersecting | |
| 113. |
A close coiled helical spring is compressed. Its wire is subjected to |
| A. | Torque |
| B. | Shear |
| C. | Tension |
| D. | Biaxial |
| E. | Compression |
| Answer» C. Tension | |
| 114. |
The plastic design of a structure based on which of the following is always safe? |
| A. | Mechanism method of analysis |
| B. | Statistical method of plastic analysis |
| C. | Upper bound theorem of plastic analysis |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. Statistical method of plastic analysis | |
| 115. |
In the case of ball bearings the contacting areas between balls and running tracks are |
| A. | circular |
| B. | parabolic |
| C. | elliptical |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. elliptical | |
| 116. |
The notch angle of Izod impact test specimen is |
| A. | 20? |
| B. | 22 |
| C. | 45? |
| D. | 30? |
| E. | 10? |
| Answer» C. 45? | |
| 117. |
Scraping of lathe bed helps in |
| A. | lubrication |
| B. | increasing friction |
| C. | Increasing the diameter of threaded portion |
| D. | reducing friction |
| E. | firm grip between parts |
| Answer» A. lubrication | |
| 118. |
In an inverted tooth chain the included angle between the outer faces of the teeth? |
| A. | 40 to 55 |
| B. | 35 to 45 |
| C. | 60 to 75 |
| D. | Increasing the diameter of threaded portion |
| E. | 75 to 85 |
| Answer» C. 60 to 75 | |
| 119. |
The value of yield stress for structural steel is about |
| A. | Increasing the diameter of threaded portion |
| B. | 3600 kg/cm2 |
| C. | 1600 kg/cm2 |
| D. | 4600 kg/cm2 |
| E. | 2600 kg/cm2 |
| Answer» E. 2600 kg/cm2 | |
| 120. |
A warm gear is generally made of |
| A. | Mild steel |
| B. | Forged steel |
| C. | Cast iron |
| D. | Aluminium |
| E. | None of the above |
| Answer» C. Cast iron | |
| 121. |
The diameter of rivets for 20 mm thick plates would be |
| A. | 10 mm |
| B. | 20 mm |
| C. | 15 mm |
| D. | 40 mm |
| E. | 30 mm |
| Answer» D. 40 mm | |
| 122. |
The ratio of the plastic moment capacity to the yield moment capacity of a rolled steel beam section is about |
| A. | 1.85 |
| B. | Increasing the diameter of threaded portion |
| C. | 1.15 |
| D. | 1.55 |
| E. | 1 |
| Answer» C. 1.15 | |
| 123. |
Which pair of gears usually has high friction losses? |
| A. | All have equal frictional loss |
| B. | Spur gears |
| C. | Bevel gears |
| D. | Helical gears |
| E. | Worm and worm wheel |
| Answer» E. Worm and worm wheel | |
| 124. |
In plastic analysis, the shape factor of a triangular section is |
| A. | 1.15 |
| B. | Increasing the diameter of threaded portion |
| C. | 2.34 |
| D. | 1.5 |
| E. | 1.85 |
| Answer» C. 2.34 | |
| 125. |
In case of quadruple riveted butt joints the joint efficiency is usually assumed in the range |
| A. | 40-50% |
| B. | 50-60% |
| C. | 85-95% |
| D. | 75-85% |
| E. | 60-75% |
| Answer» C. 85-95% | |
| 126. |
A V-belt having B section is generally used when the power to be transmitted is in the range |
| A. | 25-35 HP |
| B. | 35-50 HP |
| C. | 50-75 HP |
| D. | 75-100 HP |
| E. | 3-25 HP |
| Answer» E. 3-25 HP | |
| 127. |
In which of the following gears the lowest degree of accuracy can be expected |
| A. | Machine tools |
| B. | Aeroplane gears |
| C. | Farm machinery |
| D. | Automobile gears |
| E. | Reduction gears for turbines |
| Answer» C. Farm machinery | |
| 128. |
Induction motors are generally provided with |
| A. | Mitchel's thrust bearings |
| B. | Sleeve bearings |
| C. | Ball or roller bearings |
| D. | Magnetic bearings |
| E. | Bush bearings |
| Answer» C. Ball or roller bearings | |
| 129. |
Which of the following gears are free from axial thrust? |
| A. | Worm gears |
| B. | Spiral gears |
| C. | Helical gears |
| D. | Bevel gears |
| E. | Herringbone gears |
| Answer» E. Herringbone gears | |
| 130. |
The phenomenon of eloggation and contraction of the belt is known as |
| A. | Plasticity |
| B. | Creep |
| C. | Fatigue |
| D. | Elasticity |
| E. | Slip |
| Answer» B. Creep | |
| 131. |
Rankine theory is applied to |
| A. | bruite materials |
| B. | Increasing the diameter of threaded portion |
| C. | plastic materials |
| D. | tough materials |
| E. | ductile materials |
| Answer» A. bruite materials | |
| 132. |
The clamping nut of the turn buckle has |
| A. | Left hand threads |
| B. | Right hand threads |
| C. | Right hand threads on one side and left hand threads on the other side |
| D. | Has no threads |
| E. | None of the above |
| Answer» C. Right hand threads on one side and left hand threads on the other side | |
| 133. |
Helical springs are not subjected to |
| A. | Torsional shear stress |
| B. | Transverse shear stress |
| C. | Deflection |
| D. | Hoop stress |
| E. | Force |
| Answer» D. Hoop stress | |
| 134. |
The uniform rate of descent is maintained by a brake on the drum which applies the necessary torque of 300 kg-m what additional brake torque is required to bring the system to rest in 0.50 second? |
| A. | 6235 N-m |
| B. | 1027 N-m |
| C. | 2054 N-m |
| D. | 1580 N-m |
| E. | Increasing the diameter of threaded portion |
| Answer» C. 2054 N-m | |
| 135. |
The part of the tooth which lies between the pitch and dedendum circle is known as |
| A. | Base |
| B. | Face |
| C. | Profile |
| D. | Root |
| E. | Flank |
| Answer» E. Flank | |
| 136. |
Total strain energy theory for the failure of a material at elastic limit is also known as |
| A. | Increasing the diameter of threaded portion |
| B. | Von mises theory |
| C. | Rankine's theory |
| D. | Haig's theory |
| E. | Gust's or Treasca's theory |
| Answer» B. Von mises theory | |
| 137. |
A solid shaft of 100 mm diameter transmits 100 HP at (450/?) r.p.m. The torque in kg-m on the shaft would be |
| A. | 250 |
| B. | 375 |
| C. | 500 |
| D. | 990 |
| E. | 750 |
| Answer» C. 500 | |
| 138. |
Stone crusher rolls are generally made of |
| A. | Mild steel |
| B. | Grey iron |
| C. | Cast iron |
| D. | Cast steel |
| E. | High carbon steel |
| Answer» E. High carbon steel | |
| 139. |
The 'crowning' of flat pulleys is generally done |
| A. | To rduce the belt friction |
| B. | To prevent belt joint from damaging the belt surface |
| C. | To prevent the belt from running off the pulley |
| D. | In case of cross belt drives only |
| E. | None of the above |
| Answer» C. To prevent the belt from running off the pulley | |
| 140. |
Piston rings are usually made of |
| A. | Stainless steel |
| B. | Cast iron |
| C. | Increasing the diameter of threaded portion |
| D. | Aluminium |
| E. | High carban steel |
| Answer» B. Cast iron | |
| 141. |
The main difference between rigid and flexible coupling for shafts transmitting power is |
| A. | the number of coupling bolts are more in flexible coupling than in rigid coupling |
| B. | a flexible element is inserted around coupling bolts in one of the flanges |
| C. | There is a protective flange over bolts in the case of flexible coupling |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. a flexible element is inserted around coupling bolts in one of the flanges | |
| 142. |
Teflon is used for bearings |
| A. | When low coefficient of friction is desired |
| B. | Heat dissipation is a problem |
| C. | Space is the major consideration |
| D. | Increasing the diameter of threaded portion |
| E. | When bearings operate at very high rpm |
| Answer» A. When low coefficient of friction is desired | |
| 143. |
In case of a Saddle key |
| A. | The key is welded to shaft |
| B. | The key way is cut in shaft only |
| C. | The key ways is cut in hub only |
| D. | The key way is cut in both shaft and hub |
| E. | The key is made of flexible material |
| Answer» C. The key ways is cut in hub only | |
| 144. |
For determination of allowable stress in axial compression, IS : 800-1962 has adopted |
| A. | Euler's formula |
| B. | Secant formula |
| C. | Increasing the diameter of threaded portion |
| D. | Perry Robertson formula |
| E. | Rankines formula |
| Answer» B. Secant formula | |
| 145. |
Braking system on earth moving machinery is |
| A. | Vacuum braking |
| B. | Pneumatic braking |
| C. | Hydraulic braking |
| D. | Regenerative braking |
| E. | Mechanical braking |
| Answer» C. Hydraulic braking | |
| 146. |
In a butt welded joint, the size of weld is |
| A. | 0.5 times the throat of weld |
| B. | double the throat of weld |
| C. | Increasing the diameter of threaded portion |
| D. | equal to the throat of weld |
| Answer» A. 0.5 times the throat of weld | |
| 147. |
The shape factor of an isosceles triangle for bending about the axis parallel to the base is |
| A. | 2.74 |
| B. | Increasing the diameter of threaded portion |
| C. | 2.34 |
| D. | 1.44 |
| E. | 1.74 |
| Answer» C. 2.34 | |
| 148. |
A pivoted segment type thrust bearing is used in order to provide |
| A. | Uniform wear |
| B. | A converging film of oil |
| C. | Balanced lead |
| D. | Uniform frictional forces |
| E. | Uniform velocity |
| Answer» B. A converging film of oil | |
| 149. |
The pitch of threads on a lock-nut is |
| A. | Fine |
| B. | Very fine |
| C. | Coarse |
| D. | Same as that of nut |
| E. | None of the above |
| Answer» D. Same as that of nut | |
| 150. |
Aircraft body is |
| A. | Welded structure |
| B. | Riveted structure |
| C. | Cast structure |
| D. | Precast structure |
| E. | None of the above |
| Answer» B. Riveted structure | |
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