MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
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 | |
| 602. |
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to |
| A. | W/2 |
| B. | 2W/3 |
| C. | W/9 |
| D. | 8W/9 |
| Answer» C. W/9 | |
| 603. |
In skew bevel gearing, the axes of shafts are |
| A. | Intersecting and the teeth are curved |
| B. | Non-intersecting and nonparallel and the teeth are curved |
| C. | Non-intersecting and non-parallel and the teeth are straight |
| D. | None of the above |
| Answer» D. None of the above | |
| 604. |
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to |
| A. | Dynamic loading |
| B. | Static loading |
| C. | Combined static and dynamic loading |
| D. | Completely reversed loading |
| Answer» E. | |
| 605. |
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. | |
| 606. |
The toughness of a material _________ when it is heated |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of the Above |
| Answer» D. None of the Above | |
| 607. |
The maximum bending stress in a curved beam having symmetrical section always occur at the |
| A. | Centroidal axis |
| B. | Neutral axis |
| C. | Inside fiber |
| D. | Outside fiber |
| Answer» D. Outside fiber | |
| 608. |
The draw of cotter should not be more than |
| A. | 3 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 12 mm |
| Answer» B. 6 mm | |
| 609. |
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than |
| A. | d |
| B. | 1.5 d |
| C. | 2 d |
| D. | 2.5 d |
| Answer» D. 2.5 d | |
| 610. |
According to I.B.R., the factor of safety of riveted joint should not be less than |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 611. |
According to I.B.R., the thickness of the boiler shell should not be less than |
| A. | 4 mm |
| B. | 5 mm |
| C. | 6 mm |
| D. | 7 mm |
| Answer» E. | |
| 612. |
The number of slots in a 25 mm castle nut is |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» C. 4 | |
| 613. |
The ball bearings are provided with a cage |
| A. | To reduce friction |
| B. | To facilitate slipping of balls |
| C. | To prevent the lubricant from flowing out |
| D. | To maintain the balls at a fixed distance apart |
| Answer» E. | |
| 614. |
The rivet head used for boiler plate riveting is usually |
| A. | Pan Head |
| B. | Snap head |
| C. | Counter sunk head |
| D. | Conical head |
| Answer» C. Counter sunk head | |
| 615. |
The included angle for the V-belt is usually |
| A. | 10°-20° |
| B. | 30°-40° |
| C. | 40°-60° |
| D. | 60°-80° |
| Answer» C. 40°-60° | |
| 616. |
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be |
| A. | 12 |
| B. | 14 |
| C. | 18 |
| D. | 24 |
| Answer» D. 24 | |
| 617. |
The angle of twist of shaft is |
| A. | Directly proportional to (shaft diameter)² |
| B. | Inversely proportional to (shaft diameter)² |
| C. | Directly proportional to (shaft diameter)⁴ |
| D. | Inversely proportional to (shaft diameter)⁴ |
| Answer» E. | |
| 618. |
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 | |
| 619. |
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension) |
| A. | P1 - P2 |
| B. | P1 + P2 |
| C. | ⅟₂ × (P1 + P2) |
| D. | [⅟₂ × (P1 + P2)] + Pc |
| Answer» D. [⅟₂ × (P1 + P2)] + Pc | |
| 620. |
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension) |
| A. | [(√P1 + √P2)/2]² |
| B. | P1 + P2 |
| C. | ⅟₂× (P1 + P2) |
| D. | [⅟₂ × (P1 + P2)] + Pc |
| Answer» B. P1 + P2 | |
| 621. |
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways. |
| A. | 90° |
| B. | 135° |
| C. | 160° |
| D. | 180° |
| Answer» B. 135° | |
| 622. |
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 | |
| 623. |
The suitable material for belt in agricultural machinery is |
| A. | Leather |
| B. | Rubber |
| C. | Cotton duck |
| D. | Balata gum |
| Answer» C. Cotton duck | |
| 624. |
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by |
| A. | ZN/p |
| B. | p/ZN |
| C. | Z/pN |
| D. | N/Zp |
| Answer» B. p/ZN | |
| 625. |
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 | |
| 626. |
In a hydrodynamic lubricated bearing |
| A. | There is a thick film of lubricant between the journal and the bearing |
| B. | There is a thin film of lubricant between the journal and the bearing |
| C. | The lubricant is forced between the journal and the bearing, by external pressure |
| D. | There is no lubricant between the journal and the bearing |
| Answer» B. There is a thin film of lubricant between the journal and the bearing | |
| 627. |
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. | |
| 628. |
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v). |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» E. | |
| 629. |
The ratio of the ultimate stress to the design stress is known as |
| A. | Elastic limit |
| B. | Strain |
| C. | Factor of safety |
| D. | Bulk modulus |
| Answer» D. Bulk modulus | |
| 630. |
If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as |
| A. | b/L |
| B. | b/2L |
| C. | 1 - 2 b.L |
| D. | 1 - (b/L) |
| Answer» E. | |
| 631. |
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 | |
| 632. |
A leaf spring in automobiles is used |
| A. | To apply forces |
| B. | To measure forces |
| C. | To absorb shocks |
| D. | To store strain energy |
| Answer» D. To store strain energy | |
| 633. |
The objective of caulking in a riveted joint is to make the joint |
| A. | Free from corrosion |
| B. | Stronger in tension |
| C. | Free from stress |
| D. | Leak-proof |
| Answer» E. | |
| 634. |
The metal suitable for bearings subjected to light loads is |
| A. | Silicon bronze |
| B. | White metal |
| C. | Monel metal |
| D. | Phosphor bronze |
| Answer» E. | |
| 635. |
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 | |
| 636. |
The included angle in unified of American National threads is |
| A. | 60° |
| B. | 55° |
| C. | 47° |
| D. | 29° |
| Answer» B. 55° | |
| 637. |
The cold working of metals is carried out __________ the recrystallization temperature. |
| A. | Above |
| B. | Below |
| C. | At |
| D. | None of these |
| Answer» C. At | |
| 638. |
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation? |
| A. | Woodruff key |
| B. | Feather key |
| C. | Gib-head key |
| D. | Tangent key |
| Answer» E. | |
| 639. |
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as |
| A. | (Kf + 1)/ (Kt + 1) |
| B. | (Kf - 1)/ (Kt - 1) |
| C. | (Kt + 1)/ (Kf + 1) |
| D. | (Kt - 1)/ (Kf - 1) |
| Answer» C. (Kt + 1)/ (Kf + 1) | |
| 640. |
Antifriction bearings are |
| A. | Sleeve bearings |
| B. | Hydrodynamic bearings |
| C. | Thin lubricated bearings |
| D. | None of the above |
| Answer» E. | |
| 641. |
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as |
| A. | Bondability |
| B. | Embeddability |
| C. | Comformability |
| D. | Fatigue strength |
| Answer» D. Fatigue strength | |
| 642. |
The connecting rod bolts are tightened up so that tightening stress |
| A. | Is just sufficient to hold parts together |
| B. | Approaches yield point |
| C. | Is 50% of yield point |
| D. | Is about yield point divided by safety factor |
| Answer» C. Is 50% of yield point | |
| 643. |
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis. |
| A. | Equal to |
| B. | Twice |
| C. | Three times |
| D. | Four times |
| Answer» E. | |
| 644. |
The maximum efficiency of a square threaded screw is |
| A. | (1 - sinφ)/ (1 + sinφ) |
| B. | (1 + sinφ)/ (1 - sinφ) |
| C. | (1 - sinφ)/ (1 + cosφ) |
| D. | (1 + cosφ)/ (1 - sinφ) |
| Answer» B. (1 + sinφ)/ (1 - sinφ) | |
| 645. |
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as |
| A. | Angular bevel gears |
| B. | Crown bevel gears |
| C. | Internal bevel gears |
| D. | Miter gears |
| Answer» E. | |
| 646. |
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as |
| A. | Crown bevel gears |
| B. | Angular bevel gears |
| C. | Mitre gears |
| D. | Internal bevel gears |
| Answer» B. Angular bevel gears | |
| 647. |
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 | |
| 648. |
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will |
| A. | Have same value as that of standard specimen |
| B. | Increase |
| C. | Decrease |
| D. | None of these |
| Answer» D. None of these | |
| 649. |
The bearings of medium series have capacity __________ over the light series. |
| A. | 10 to 20% |
| B. | 20 to 30% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» D. 40 to 50% | |
| 650. |
In designing a key, it is assumed that the distribution of forces along the length of key |
| A. | Varies linearly |
| B. | Is uniform throughout |
| C. | Varies exponentially, being more at the torque-input end |
| D. | Varies exponentially, being less at the torque-input end |
| Answer» C. Varies exponentially, being more at the torque-input end | |