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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.
| 701. |
_The groove angle of pulleys for V-belt is$? |
| A. | 340 to 360 |
| B. | 420 to 450 |
| C. | More than 400 |
| D. | 300 to 320 |
| Answer» B. 420 to 450 | |
| 702. |
_When the screw in a mechanical screw jack rotates, the load kept on the top of it moves$? |
| A. | Axially upwards |
| B. | Axially downwards |
| C. | Axially upwards or downwards |
| D. | None of these |
| Answer» D. None of these | |
| 703. |
_The power transmitted by the belt drive can be increased by$? |
| A. | Increasing the initial tension in the belt |
| B. | Dressing the belt to increase the coefficient of friction |
| C. | Increasing wrap angle by using idler pulley |
| D. | All of the above methods |
| Answer» E. | |
| 704. |
_The ratio of endurance limit in shear to the endurance limit in flexure is$? |
| A. | 0.33 |
| B. | 0.4 |
| C. | 0.5 |
| D. | 0.55 |
| Answer» E. | |
| 705. |
_When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,$? |
| A. | Bevel gearing |
| B. | Helical gearing |
| C. | Worm gearing |
| D. | None of these |
| Answer» B. Helical gearing | |
| 706. |
_Three different weights fall from a certain height under vacuum. They will take$? |
| A. | Same time to reach earth |
| B. | Times proportional to weight to reach earth |
| C. | Times inversely proportional to weight to reach earth |
| D. | None of the above |
| Answer» B. Times proportional to weight to reach earth | |
| 707. |
_A self locking screw has$? |
| A. | Fine threads |
| B. | Course threads |
| C. | Coefficient of friction is greater than tangent of load angle |
| D. | Hole for inserting split pin |
| Answer» D. Hole for inserting split pin | |
| 708. |
_The belt slip occurs due to$? |
| A. | Heavy load |
| B. | Loose belt |
| C. | Driving pulley too small |
| D. | Any one of the above |
| Answer» E. | |
| 709. |
_If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited$? |
| A. | Square |
| B. | Acme |
| C. | Buttress |
| D. | BSW |
| Answer» D. BSW | |
| 710. |
_An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called$? |
| A. | Addendum circle |
| B. | Dedendum circle |
| C. | Pitch circle |
| D. | Clearance circle |
| Answer» D. Clearance circle | |
| 711. |
_Turn buckle has$? |
| A. | Right hand threads on bout ends |
| B. | Left hand threads on both ends |
| C. | Left hand threads on one end and right hand threads on other end |
| D. | No threads |
| Answer» D. No threads | |
| 712. |
_The fatigue stress concentration factor is defined as$? |
| A. | The ratio of endurance limit with stress concentration to the endurance limit without stress concentration |
| B. | The ratio of endurance limit without stress concentration to the endurance limit with stress concentration |
| C. | The product of the endurance limits with and without stress concentration |
| D. | All of the above |
| Answer» C. The product of the endurance limits with and without stress concentration | |
| 713. |
_The metal suitable for bearings subjected to heavy loads is$? |
| A. | White metal |
| B. | Silicon bronze |
| C. | Monel metal |
| D. | Phosphor bronze |
| Answer» B. Silicon bronze | |
| 714. |
_The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to$? |
| A. | Static load |
| B. | Dynamic load |
| C. | Static as well as dynamic load |
| D. | Completely reversed load |
| Answer» E. | |
| 715. |
_The included angle for the V-belt is usually$? |
| A. | 10°-20° |
| B. | 30°-40° |
| C. | 40°-60° |
| D. | 60°-80° |
| Answer» C. 40¬¨‚àû-60¬¨‚àû | |
| 716. |
_Which process will increase the fatigue duration of parts?$? |
| A. | Finishing and polishing |
| B. | Shot-peening |
| C. | De-carburisation |
| D. | Electroplating |
| Answer» C. De-carburisation | |
| 717. |
_Lewis equation is applied$? |
| A. | Only to the pinion |
| B. | Only to the gear |
| C. | To stronger of the pinion or gear |
| D. | To weaker of the pinion or gear |
| Answer» E. | |
| 718. |
_The shock absorbing capacity of a bolt may be increased by$? |
| A. | Increasing its shank diameter |
| B. | Decreasing its shank diameter |
| C. | Tightening the bolt properly |
| D. | Making the shank diameter equal to core diameter of thread |
| Answer» C. Tightening the bolt properly | |
| 719. |
The included angle for the British Association thread is$? |
| A. | 29° |
| B. | 55° |
| C. | 47.3° |
| D. | 60° |
| Answer» C. 47.3¬¨‚àû | |
| 720. |
The shock resistance of steel is increased by adding$? |
| A. | Nickel |
| B. | Chromium |
| C. | Nickel and chromium |
| D. | Cobalt and molybdenum |
| Answer» D. Cobalt and molybdenum | |
| 721. |
The contact ratio for gears is$? |
| A. | Zero |
| B. | Less than one |
| C. | Greater than one |
| D. | None of these |
| Answer» D. None of these | |
| 722. |
The power transmitted by means of a belt depends upon$? |
| A. | Velocity of the belt |
| B. | Tension under which the belt is placed on the pulleys |
| C. | Arc of contact between the belt and the smaller pulley |
| D. | All of the above |
| Answer» E. | |
| 723. |
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.$? |
| A. | Partially |
| B. | Fully |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Fully | |
| 724. |
A steel containing 0.8% carbon is known as$? |
| A. | Eutectoid steel |
| B. | Hypereutectoid steel |
| C. | Hypo-eutectoid steel |
| D. | None of these |
| Answer» B. Hypereutectoid steel | |
| 725. |
A connecting rod subjected to an axial load may buckle with$? |
| A. | X-axis as neutral axis |
| B. | Y-axis as neutral axis |
| C. | X-axis or Y-axis as neutral axis |
| D. | Z-axis |
| Answer» D. Z-axis | |
| 726. |
Which is correct statement? Stress concentration in cyclic loading is$? |
| A. | Very serious in brittle materials and less serious in ductile materials |
| B. | Very serious in ductile materials and less serious in brittle materials |
| C. | Equally serious in both types of materials |
| D. | Seriousness would depend on other factors |
| Answer» D. Seriousness would depend on other factors | |
| 727. |
Which of the following screw thread is used for power transmission in one direction only?$? |
| A. | Square threads |
| B. | Multiple threads |
| C. | Acme threads |
| D. | Buttress threads |
| Answer» E. | |
| 728. |
The function of cutting oil when threading a pipe is to$? |
| A. | Provide cooling action |
| B. | Lubricate the dies |
| C. | Help removes chips |
| D. | All of the above |
| Answer» E. | |
| 729. |
The following type of nut is used with alien bolt$? |
| A. | Hexagonal nut |
| B. | Slotted nut |
| C. | Castle nut |
| D. | Any one of the above |
| Answer» E. | |
| 730. |
The fatigue life of a part can be improved by$? |
| A. | Electroplating |
| B. | Polishing |
| C. | Coating |
| D. | Shot peening |
| Answer» E. | |
| 731. |
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?$? |
| A. | Maximum principal stress theory |
| B. | Maximum shear stress theory |
| C. | Maximum strain energy theory |
| D. | Maximum distortion energy theory |
| Answer» B. Maximum shear stress theory | |
| 732. |
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)$? |
| A. | T₁/T₂ = μθ × n |
| B. | T₁/T₂ = (μθ)n |
| C. | T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n |
| D. | T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n |
| Answer» E. | |
| 733. |
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as$? |
| A. | Helix angle |
| B. | Pressure angle |
| C. | Pitch lead angle |
| D. | None of these |
| Answer» B. Pressure angle | |
| 734. |
When a belt drive is transmitting maximum power,$? |
| A. | Effective tension is equal to centrifugal tension |
| B. | Effective tension is half of centrifugal tension |
| C. | Driving tension on slack side is equal to centrifugal tension |
| D. | Driving tension on tight side is twice the centrifugal tension |
| Answer» E. | |
| 735. |
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be$? |
| A. | W/A |
| B. | W/2A |
| C. | 2W/A |
| D. | 3W/A |
| Answer» D. 3W/A | |
| 736. |
18/8 steel contains$? |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 8% vanadium |
| D. | 18% vanadium and 8% nickel |
| Answer» C. 18% nickel and 8% vanadium | |
| 737. |
The V-belts are particularly suitable for __________ drives.$? |
| A. | Short |
| B. | Long |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Long | |
| 738. |
The material generally used for aircraft components is$? |
| A. | Mild steel |
| B. | High speed steel |
| C. | Stainless steel |
| D. | Aluminium |
| Answer» E. | |
| 739. |
Machine screws are$? |
| A. | Similar to small size tap bolts except that a greater variety of shapes of heads are available |
| B. | Slotted for a screw driver and generally used with a nut |
| C. | Used to prevent relative motion between two parts |
| D. | Similar to stud |
| Answer» C. Used to prevent relative motion between two parts | |
| 740. |
A key way lowers$? |
| A. | The strength of the shaft |
| B. | The rigidity of the shaft |
| C. | Both the strength and rigidity of the shaft |
| D. | The ductility of the shaft |
| Answer» D. The ductility of the shaft | |
| 741. |
A bolt$? |
| A. | Has a head on one end and a nut fitted to the other |
| B. | Has head at one end and other end fits into a tapped hole in the other part to be joined |
| C. | Has both the ends threaded |
| D. | Is provided with pointed threads |
| Answer» B. Has head at one end and other end fits into a tapped hole in the other part to be joined | |
| 742. |
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the$? |
| A. | Carbon content is 2% |
| B. | Maximum compressive strength is 200 N/mm² |
| C. | Minimum tensile strength is 200 N/mm² |
| D. | Maximum shear strength is 200 N/mm² |
| Answer» D. Maximum shear strength is 200 N/mm¬¨‚⧠| |
| 743. |
The endurance limit of a material with finished surface in comparison to rough surface is$? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on quantum of load |
| Answer» B. Less | |
| 744. |
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by$? |
| A. | 0.5 mm up to 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 | |
| 745. |
In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called$? |
| A. | Normal pitch |
| B. | Axial pitch |
| C. | Diametral pitch |
| D. | Module |
| Answer» B. Axial pitch | |
| 746. |
When a bolt is subjected to an external load, the stress induced in the bolt will be$? |
| A. | Tensile stress |
| B. | Shear stress |
| C. | Combined tensile and shear stress |
| D. | Any one of these |
| Answer» E. | |
| 747. |
The face of the tooth is the$? |
| A. | Surface of the top of the tooth |
| B. | Surface of the tooth above the pitch surface |
| C. | Surface of the tooth below the pitch surface |
| D. | Width of the tooth measured along the pitch circle |
| Answer» C. Surface of the tooth below the pitch surface | |
| 748. |
The acme threads are usually found on$? |
| A. | Spindles of bench vices |
| B. | Railway carriage couplings |
| C. | Feed mechanism of machine tools |
| D. | Screw cutting lathes |
| Answer» E. | |
| 749. |
A column of length l is fixed at both ends. The equivalent length of the column is$? |
| A. | l/2 |
| B. | l/‚à ö2 |
| C. | l |
| D. | 2 l |
| Answer» B. l/‚Äö√ √∂2 | |
| 750. |
A connecting rod is designed as a$? |
| A. | Long column |
| B. | Short column |
| C. | Strut |
| D. | All of these |
| Answer» D. All of these | |