MCQOPTIONS
Saved Bookmarks
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.
| 551. |
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that |
| A. | Shaft B is better than shaft A |
| B. | Shaft A is better than shaft B |
| C. | Both the shafts are equally good |
| D. | None of these |
| Answer» B. Shaft A is better than shaft B | |
| 552. |
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress) |
| A. | σ [1 + (b/2a)] |
| B. | σ [1 + (2a/b)] |
| C. | σ [1 + (b/3a)] |
| D. | σ [1 + (3a/b)] |
| Answer» C. σ [1 + (b/3a)] | |
| 553. |
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by |
| A. | √2P/s.l |
| B. | P/2.s.l |
| C. | P/√2.s.l |
| D. | 2P/s.l |
| Answer» D. 2P/s.l | |
| 554. |
The square 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» D. Screw cutting lathes | |
| 555. |
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. | |
| 556. |
Buttress threads are usually found on |
| A. | Screw cutting lathes |
| B. | Feed mechanisms |
| C. | Spindles of bench vices |
| D. | Railway carriage couplings |
| Answer» E. | |
| 557. |
Lewis equation in gears is used to find the |
| A. | Tensile stress in bending |
| B. | Shear stress |
| C. | Compressive stress in bending |
| D. | Fatigue stress |
| Answer» D. Fatigue stress | |
| 558. |
The centrifugal tension in belts |
| A. | Decreases the power transmitted |
| B. | Increases the power transmitted |
| C. | Increase the wrap angle |
| D. | Increases the belt tension without increasing power transmission |
| Answer» E. | |
| 559. |
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called |
| A. | Normal pitch |
| B. | Axial pitch |
| C. | Diametral pitch |
| D. | Module |
| Answer» C. Diametral pitch | |
| 560. |
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 | |
| 561. |
The ratio of pitch circle diameter in millimeters to the number of teeth, is called |
| A. | Circular pitch |
| B. | Diametral pitch |
| C. | Module |
| D. | None of these |
| Answer» D. None of these | |
| 562. |
A screw is specified by its |
| A. | Major diameter |
| B. | Minor diameter |
| C. | Pitch diameter |
| D. | Pitch |
| Answer» B. Minor diameter | |
| 563. |
In order to obtain bolt of uniform strength |
| A. | Increase shank diameter |
| B. | Increase its length |
| C. | Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread |
| D. | Tighten die bolt properly |
| Answer» D. Tighten die bolt properly | |
| 564. |
The function of the washer is to |
| A. | Fill up the axial gap |
| B. | Provide bearing area |
| C. | Provide cushioning effect |
| D. | Absorb shocks and vibrations |
| Answer» C. Provide cushioning effect | |
| 565. |
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 | |
| 566. |
The flank of the tooth is the |
| A. | Surface of the top of the tooth |
| B. | Surface of the tooth above the pitch surface |
| C. | Width of the tooth measured along the pitch circle |
| D. | Surface of the tooth below the pitch surface |
| Answer» E. | |
| 567. |
The velocity of sliding __________ the distance of the point of contact from the pitch point. |
| A. | Is directly proportional to |
| B. | Is inversely proportional to |
| C. | Is equal to cos φ multiplied by |
| D. | Does not depend upon |
| Answer» B. Is inversely proportional to | |
| 568. |
In a flange coupling, the bolts are subjected to |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | None of these |
| Answer» D. None of these | |
| 569. |
Transverse fillet welded joints are designed for |
| A. | Tensile strength |
| B. | Compressive strength |
| C. | Shear strength |
| D. | Bending strength |
| Answer» B. Compressive strength | |
| 570. |
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for |
| A. | Reducing stress concentration |
| B. | Ease of manufacture |
| C. | Safety |
| D. | Fullering and caulking |
| Answer» E. | |
| 571. |
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing. |
| A. | Thick film |
| B. | Thin film |
| C. | Either A or B |
| D. | None of these |
| Answer» C. Either A or B | |
| 572. |
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm) |
| A. | d = √t |
| B. | d = 1.6√t |
| C. | d = 2√t |
| D. | d = 6√t |
| Answer» E. | |
| 573. |
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², 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. | |
| 574. |
The form factor of a helical gear __________ with the increase in the helix angle. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of these |
| Answer» B. Decreases | |
| 575. |
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. | |
| 576. |
For maximum power, the velocity of the belt will be |
| A. | √(T/m) |
| B. | √(T/2m) |
| C. | √(T/3m) |
| D. | None of these |
| Answer» D. None of these | |
| 577. |
The notch angle of the Izod impact test specimen is |
| A. | 10° |
| B. | 20° |
| C. | 30° |
| D. | 45° |
| Answer» E. | |
| 578. |
The washer is generally specified by its |
| A. | Outer diameter |
| B. | Hole diameter |
| C. | Thickness |
| D. | Mean diameter |
| Answer» C. Thickness | |
| 579. |
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 | |
| 580. |
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 | |
| 581. |
Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material. |
| A. | Elastic strength |
| B. | Yield strength |
| C. | Shear strength |
| D. | None of these |
| Answer» C. Shear strength | |
| 582. |
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that |
| A. | It is subjected to a higher cyclic loading than the outer side |
| B. | It is subjected to a higher stress than the outer side |
| C. | It is more stretched than the outer side during the manufacturing process |
| D. | It has a lower curvature than the outer side |
| Answer» B. It is subjected to a higher stress than the outer side | |
| 583. |
A column of length l is fixed at both ends. The equivalent length of the column is |
| A. | l/2 |
| B. | l/√2 |
| C. | l |
| D. | 2 l |
| Answer» B. l/√2 | |
| 584. |
For circumferential joint in boilers, the type of joint used is |
| A. | Butt joint with single cover plate |
| B. | Butt joint with double cover plate |
| C. | Lap joint with one ring overlapping the other |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 585. |
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 | |
| 586. |
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called |
| A. | Ring nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Jam nut |
| Answer» B. Castle nut | |
| 587. |
A saddle key __________ power through frictional resistance only. |
| A. | Transmits |
| B. | Does not transmit |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Does not transmit | |
| 588. |
In case of pressure vessels having closed ends, the fluid pressure induces |
| A. | Longitudinal stress |
| B. | Shear stress |
| C. | Circumferential stress |
| D. | None of these |
| Answer» B. Shear stress | |
| 589. |
In case of pressure vessels having open ends, the fluid pressure induces |
| A. | Longitudinal stress |
| B. | Circumferential stress |
| C. | Shear stress |
| D. | None of these |
| Answer» C. Shear stress | |
| 590. |
In standard taper roller bearings, the angle of taper of outer raceway is |
| A. | 5° |
| B. | 8° |
| C. | 15° |
| D. | 25° |
| Answer» E. | |
| 591. |
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket) |
| A. | p = D sin (90°/T) |
| B. | p = D sin (120°/T) |
| C. | p = D sin (180°/T) |
| D. | p = D sin (360°/T) |
| Answer» D. p = D sin (360°/T) | |
| 592. |
In oilness bearings |
| A. | The oil film pressure is generated only by the rotation of the journal |
| B. | The oil film is maintained by supplying oil under pressure |
| C. | Do not require external supply of lubricant |
| D. | Grease required to be applied after some intervals |
| Answer» D. Grease required to be applied after some intervals | |
| 593. |
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 594. |
For longitudinal joint in boilers, the type of joint used is |
| A. | Butt joint with single cover plate |
| B. | Butt joint with double cover plate |
| C. | Lap joint with one ring overlapping the other |
| D. | Any one of the above |
| Answer» C. Lap joint with one ring overlapping the other | |
| 595. |
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils) |
| A. | Gd⁴/ 8D3n |
| B. | Gd3/ 8D3n |
| C. | Gd⁴/ 4D3n |
| D. | Gd⁴/ 8D²n |
| Answer» B. Gd3/ 8D3n | |
| 596. |
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² 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 | |
| 597. |
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth. |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 598. |
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth) |
| A. | 0.124 - (0.684/T) |
| B. | 0.154 - (0.912/T) |
| C. | 0.175 - (0.841/T) |
| D. | None of these |
| Answer» B. 0.154 - (0.912/T) | |
| 599. |
When a metal or alloy is cold worked, |
| A. | Its hardness and strength increases |
| B. | It is worked below recrystallization temperature |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 600. |
The resilience of a bolt may be increased by |
| A. | Increasing its shank diameter |
| B. | Increasing its length |
| C. | Decreasing its shank diameter |
| D. | Decreasing its length |
| Answer» C. Decreasing its shank diameter | |