MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 509 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Friction losses in spur gears may be of the order of |
| A. | 15% to 20% |
| B. | 20% to 30% |
| C. | 5% to 10% |
| D. | 10% to 15% |
| E. | Less than 5% |
| Answer» F. | |
| 102. |
The cam used for high speed engines is |
| A. | Cycloidal |
| B. | Involute |
| C. | Flat |
| D. | Uniform acceleration |
| E. | Tangent |
| Answer» B. Involute | |
| 103. |
The period during which a cam follower does not move is known as |
| A. | Free period |
| B. | Swell period |
| C. | Constant period |
| D. | Stationary period |
| E. | Fixed period |
| Answer» C. Constant period | |
| 104. |
In order to minimise jerks, the type of cam used is |
| A. | Cycloidal |
| B. | Hyperbolic |
| C. | S.H.M. |
| D. | Cylindrical |
| E. | Parabolic |
| Answer» B. Hyperbolic | |
| 105. |
For butt welding of two plates each of which is 25 mm thick, the best process would be |
| A. | Electron slag welding |
| B. | Submerged are welding |
| C. | MIG welding |
| D. | Gas welding |
| E. | TIG welding |
| Answer» B. Submerged are welding | |
| 106. |
The stretching in a belt is controlled by |
| A. | Increasing belt velocity |
| B. | Reducing stress in the belt |
| C. | Increasing belt thickness |
| D. | Reducing belt length |
| E. | Increasing centre distance |
| Answer» C. Increasing belt thickness | |
| 107. |
When a nut is tightened by placing a washer under it, the bolt tends to fall in |
| A. | compression |
| B. | tension |
| C. | shear |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. shear | |
| 108. |
Gears for wrist watches are generally manufactured by |
| A. | Pitcl, angle |
| B. | Helix angle |
| C. | Axial pitch angle |
| D. | Lead angle |
| E. | Pressure angle |
| Answer» C. Axial pitch angle | |
| 109. |
The deep bins are the containers in which the plane of rupture intersects |
| A. | the top surface of material stored |
| B. | Increasing the diameter of threaded portion |
| C. | the opposite surface (wall) near the bottom |
| D. | the bottom survace of material stored |
| E. | the opposite face (wall) near the top |
| Answer» F. | |
| 110. |
In case of aircraft body the type of welding generally used is |
| A. | Gas welding |
| B. | Arc welding |
| C. | Spot welding |
| D. | Seam welding |
| E. | None of the above |
| Answer» F. | |
| 111. |
Jaw clutches are generally used for |
| A. | high horse power low rpm applications |
| B. | low horse power high rpm applications |
| C. | high horse power high rpm applications |
| D. | low horse power low rpm applications |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 112. |
Within elastic limits the greatest amount of strain energy per unit volume that a material can absorb is known as |
| A. | Resilience |
| B. | Shock proof energy |
| C. | Proof resilience |
| D. | Impact energy limit |
| E. | Strain hardening |
| Answer» D. Impact energy limit | |
| 113. |
A 20 HP 1500 r.p.m. induction motor will take current of nearly |
| A. | 20-30 Amp |
| B. | 5 Amp |
| C. | 1 Amp |
| D. | 10-15 Amp |
| E. | 15-20 Amp |
| Answer» B. 5 Amp | |
| 114. |
Which oil has highest specific gravity? |
| A. | Castor |
| B. | Sperm |
| C. | Cotton Seed |
| D. | Petroleum |
| E. | Turpentine |
| Answer» B. Sperm | |
| 115. |
The light gauge steel structural members are generally |
| A. | fabricated fromthick sections |
| B. | hot rolled |
| C. | Increasing the diameter of threaded portion |
| D. | cold formed |
| E. | casted |
| Answer» E. casted | |
| 116. |
In which component a ball or roller bearing cannot be used? |
| A. | Water circulating pump |
| B. | Wheel bearing in automobiles |
| C. | Small end of connecting rod |
| D. | Carankshaft main bearings |
| E. | Big end of connecting rod |
| Answer» F. | |
| 117. |
Within the elastic range, the bulk modulus of elasticity is defined as the ratio of |
| A. | hydrostatic stress to the volumetric strain |
| B. | shearing stress to the shearing strain |
| C. | longitudinal stress to the longitudinal strain |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. shearing stress to the shearing strain | |
| 118. |
Which of the following fit can be used for interchangeable assembly |
| A. | 10 kg |
| B. | Tight |
| C. | Sung |
| D. | Medium force |
| E. | Wringing |
| Answer» D. Medium force | |
| 119. |
The shock absorbing capacity of a bolt is increased by |
| A. | Proper tightening |
| B. | Use of a spring washer |
| C. | Making shank diameter equal to the core diameter |
| D. | Preventingstress concentration any where in the bolt |
| E. | None of the above |
| Answer» D. Preventingstress concentration any where in the bolt | |
| 120. |
A double start screw has |
| A. | Two threads per inch |
| B. | Fine threads |
| C. | Coarse threads |
| D. | Two threads at some phase angle |
| E. | None of the above |
| Answer» E. None of the above | |
| 121. |
In general, the bunkers are constructed |
| A. | circular and polygonal in plan |
| B. | square and rectangular in plan |
| C. | Increasing the diameter of threaded portion |
| D. | hexagonal in plan |
| E. | elliptical in plan |
| Answer» C. Increasing the diameter of threaded portion | |
| 122. |
When it is desired to transmit a high velocity ratio in a limited space, the device used is |
| A. | Worm and worm wheel |
| B. | Bevel gears |
| C. | Helical gears |
| D. | Noone of the above |
| E. | None of the above |
| Answer» B. Bevel gears | |
| 123. |
In flange coupling the weakest element should be |
| A. | Shaft |
| B. | Flange |
| C. | Key |
| D. | Bolts |
| E. | Bolt bush |
| Answer» D. Bolts | |
| 124. |
Which of the following has highest strength to weight ratio? |
| A. | Alloy steel, heat treated |
| B. | Brass |
| C. | Stainless steel |
| D. | Steel piano wire |
| E. | Aluminium, hard rolled |
| Answer» E. Aluminium, hard rolled | |
| 125. |
A positive infinitely variable (P.I.V.) system utilises |
| A. | Variable pitch chain drive system |
| B. | Hydraulic variable speed drive |
| C. | Rolling contact variable speed |
| D. | Vee belt variable speed system |
| E. | None of the above |
| Answer» B. Hydraulic variable speed drive | |
| 126. |
The assumption of bi-linearly idealised stress-strain relationship for plastic analysis and design is used for |
| A. | steel structures |
| B. | Increasing the diameter of threaded portion |
| C. | prestressed concrete structures |
| D. | reinforced concrete structures |
| E. | aluminium structures |
| Answer» B. Increasing the diameter of threaded portion | |
| 127. |
Battens in compound steel columns are provided to |
| A. | increase the column capacity |
| B. | ensure unified behaviour |
| C. | prevent buckling |
| D. | Increasing the diameter of threaded portion |
| E. | decrease the buckling in members |
| Answer» C. prevent buckling | |
| 128. |
The bending moment at a plastic hinge is |
| A. | equal to zero |
| B. | equal to plastic moment of the section |
| C. | Increasing the diameter of threaded portion |
| D. | equal to yield moment of the section |
| E. | greater than plastic moment of the section |
| Answer» C. Increasing the diameter of threaded portion | |
| 129. |
V-belt sections generally used in an automobiles are |
| A. | A and B |
| B. | C |
| C. | D |
| D. | E |
| E. | Any one of the above |
| Answer» B. C | |
| 130. |
For a transverse load on a fillet weld of equal legs, the plane of maximum shear force occurs at |
| A. | 72? |
| B. | 75? |
| C. | 45? |
| D. | 30? |
| E. | 67 |
| Answer» F. | |
| 131. |
The form coefficient of a spring is |
| A. | Dynamic load carrying capacity |
| B. | It capability to store energy |
| C. | The load/unit drflection |
| D. | Load/spring area |
| E. | Ratio of coil diameter to wire diameter |
| Answer» C. The load/unit drflection | |
| 132. |
An out-of-plane web distribution is known as |
| A. | column buckling |
| B. | web buckling |
| C. | vertical web buckling |
| D. | any of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 133. |
If M 20 coarse pitch is 2.5 mm the mm the fine pitch for the size would be |
| A. | 10 mm |
| B. | 5 mm |
| C. | 2.5 mm |
| D. | 1.5 mm |
| E. | None of the above |
| Answer» E. None of the above | |
| 134. |
While designing a shaft, hub and a key, care is taken so that |
| A. | Key is the weakest component |
| B. | Shaft is the stronger component |
| C. | Key is the strongest component |
| D. | Shaft is the weakest component |
| E. | Hub is the strongest component |
| Answer» B. Shaft is the stronger component | |
| 135. |
The maximum size of the fillet weld that can be applied to the toe of an angle or the round edge should be |
| A. | 1.5 mm less than the thickness of the plate |
| B. | Increasing the diameter of threaded portion |
| C. | equal to the thickness of the plate |
| D. | 0.75 times the thickness of the plate |
| E. | 1.5 mm more than the thickness of the plate |
| Answer» E. 1.5 mm more than the thickness of the plate | |
| 136. |
Which cam profile is preferred for minimum jerks? |
| A. | Flat |
| B. | Involute |
| C. | Cycloidal |
| D. | Simple harmonic |
| E. | Any of the above |
| Answer» D. Simple harmonic | |
| 137. |
Treads in tyres are provided to |
| A. | increase tyre grip on the road |
| B. | prevent skidding on dusty roads |
| C. | prevent skidding on wet roads |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. prevent skidding on wet roads | |
| 138. |
The stability of a structure is ensured if the restoring moment is |
| A. | equal to |
| B. | greater than |
| C. | Increasing the diameter of threaded portion |
| D. | smaller than |
| Answer» D. smaller than | |
| 139. |
The allowable stresses for the design of steel tanks are adopted |
| A. | 80 percent reduced as given in IS : 800 |
| B. | 95 percent reduced as given in IS : 800 |
| C. | 50 percent reduced as given in IS : 800 |
| D. | Increasing the diameter of threaded portion |
| E. | as given in IS : 800 |
| Answer» B. 95 percent reduced as given in IS : 800 | |
| 140. |
The balls in a ball bearing remain in position |
| A. | Due to centrifugal force |
| B. | In a cage |
| C. | Due to dead load on bearing |
| D. | By lubricant |
| E. | Automatically |
| Answer» C. Due to dead load on bearing | |
| 141. |
Which of the following alloying metal for steels acts as a deoxidizing and desulphurising agent? |
| A. | Nickel |
| B. | Increasing the diameter of threaded portion |
| C. | Chromium |
| D. | Tungsten |
| E. | Manganese |
| Answer» E. Manganese | |
| 142. |
For the same power transmission, V-belts are |
| A. | wider, thinner |
| B. | thinner, wider |
| C. | Increasing the diameter of threaded portion |
| D. | narrow, thicker |
| E. | thicker, narrow |
| Answer» E. thicker, narrow | |
| 143. |
The life of a ball bearing is usually given in |
| A. | hours of service |
| B. | total rpm |
| C. | either of (A) or (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. none of the above | |
| 144. |
Which of the following types of gears are free from interference? |
| A. | Cycloidal |
| B. | Epicycloidal |
| C. | Involute |
| D. | Stub |
| E. | Hypocycloidal |
| Answer» B. Epicycloidal | |
| 145. |
A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is increased and load reduced to half the deflection at the free end as compared to original deflection would be |
| A. | 4 times |
| B. | 16 times |
| C. | 1/2 times |
| D. | 2 times |
| E. | 8 times |
| Answer» B. 16 times | |
| 146. |
The fatigue limit of a material |
| A. | Is greatly decreased by poor surface conditions |
| B. | Is improved if there is rough surface |
| C. | Is independent of surface conditions |
| D. | Surface defects which extend upto core have no influence of fatigue limits |
| E. | None of the above |
| Answer» B. Is improved if there is rough surface | |
| 147. |
A spherical metal vessel 120 cm diameter is subjected to an internal pressure of 15 kg/sq cm. If the permissible stress is 625 kg/sq cm and the efficiency of the riveted joints is 75%, the required thickness of the plate would be |
| A. | 10 mm |
| B. | 2 mm |
| C. | 5 mm |
| D. | 1 mm |
| E. | 8 mm |
| Answer» B. 2 mm | |
| 148. |
In a ball bearing a ball is subjected to |
| A. | Compressive stress |
| B. | Tensile stress |
| C. | Shear stress |
| D. | Cyclic stress or fatigue |
| E. | None of the above |
| Answer» E. None of the above | |
| 149. |
Backlash is |
| A. | Sum of the clearance of two gears |
| B. | Mutual play between two gears |
| C. | The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on pitch circle |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 150. |
The limit design of steel structures makes use of |
| A. | elastic and plastic analysis of structures |
| B. | ultimate analysis |
| C. | Increasing the diameter of threaded portion |
| D. | plastic analysis of structures |
| E. | elastic analysis of structures |
| Answer» E. elastic analysis of structures | |