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.
| 451. |
In case of V belt drive |
| A. | The belt should touch the bottom of groove in the pulley |
| B. | The belt should not touch the bottom of groove in the pulley |
| C. | The belt should not touch the sides of groove in the pulley |
| D. | None of the above |
| Answer» C. The belt should not touch the sides of groove in the pulley | |
| 452. |
The shear plane in case of bolts should |
| A. | Be across threaded portion of shank |
| B. | Be parallel to axis of bolt |
| C. | Be normal to threaded portion of shank |
| D. | Never be across the threaded portion |
| Answer» E. | |
| 453. |
In levers, leverage is the ratio of |
| A. | Load lifted to the effort applied |
| B. | Mechanical advantage to the velocity ratio |
| C. | Load arm to the effort arm |
| D. | Effort arm to the load arm |
| Answer» E. | |
| 454. |
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. | |
| 455. |
Plastic flow in ductile materials |
| A. | Increases the seriousness of static loading stress concentration |
| B. | Lessens the seriousness of static loading stress concentration |
| C. | Has no effect on it |
| D. | Depends on other considerations |
| Answer» C. Has no effect on it | |
| 456. |
If a load W is applied instantaneously on a bar; Then the stress induced in bar will |
| A. | Be independent of ratio of mass of load W to mass of bar (y) |
| B. | Increase with increase in y |
| C. | Decrease with decrease in y |
| D. | Depend on other considerations |
| Answer» B. Increase with increase in y | |
| 457. |
If threads on a bolt are left hand, threads on nut will be |
| A. | Right hand with same pitch |
| B. | Left hand with same pitch |
| C. | Could be left or right hand |
| D. | Right hand with fine pitch |
| Answer» C. Could be left or right hand | |
| 458. |
The dedendum is the radial distance from the |
| A. | Pitch circle to the top of a tooth |
| B. | Pitch circle to the bottom of a tooth |
| C. | Top of a tooth to the bottom of a tooth |
| D. | Addendum circle to the clearance circle |
| Answer» C. Top of a tooth to the bottom of a tooth | |
| 459. |
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt) |
| A. | 0.5 d |
| B. | 0.75 d |
| C. | d |
| D. | 1.25 d |
| Answer» D. 1.25 d | |
| 460. |
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by |
| A. | Equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | Equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | Equating shearing resistance to the crushing resistance of the rivets |
| D. | None of the above |
| Answer» D. None of the above | |
| 461. |
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by |
| A. | Equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | Equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | Equating shearing resistance to the crushing resistance of the rivets |
| D. | None of the above |
| Answer» C. Equating shearing resistance to the crushing resistance of the rivets | |
| 462. |
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. | |
| 463. |
In second type of levers, |
| A. | Load is in between the fulcrum and effort |
| B. | Effort is in between the fulcrum and load |
| C. | Fulcrum is in between the load and effort |
| D. | None of these |
| Answer» B. Effort is in between the fulcrum and load | |
| 464. |
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is |
| A. | 1 kN-m |
| B. | 2 kN-m |
| C. | 3 kN-m |
| D. | 4 kN-m |
| Answer» D. 4 kN-m | |
| 465. |
In a horizontal flat belt drive, it is customary to use |
| A. | Bottom side of belt as slack side |
| B. | Top side of belt as slack side |
| C. | Idler pulley |
| D. | None of the above |
| Answer» C. Idler pulley | |
| 466. |
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is |
| A. | Larger |
| B. | Smaller |
| C. | Equal |
| D. | Larger/smaller depending on diameter of spring coil |
| Answer» B. Smaller | |
| 467. |
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to |
| A. | T₁ - T₂ + Tc |
| B. | T₁ + T₂ + Tc |
| C. | (T₁ - T₂ + Tc)/2 |
| D. | (T₁ + T₂ + Tc)/2 |
| Answer» E. | |
| 468. |
The objective of 'crowning' of the flat pulleys of belt drive is to |
| A. | Prevent the belt from running off the pulley |
| B. | Increase the power transmission capacity |
| C. | Increase the belt velocity |
| D. | Prevent the belt joint from damaging the belt surface |
| Answer» B. Increase the power transmission capacity | |
| 469. |
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of |
| A. | Combined effect of transverse shear stress and bending stress in the wire |
| B. | Combined effect of bending stress and curvature of the wire |
| C. | Combined effect of transverse shear stress and curvature of wire |
| D. | Combined effect of torsional shear stress and transverse shear stress in the wire |
| Answer» C. Combined effect of transverse shear stress and curvature of wire | |
| 470. |
Wire ropes as compared to cotton ropes |
| A. | Are lighter in weight |
| B. | Offer silent operation |
| C. | Can withstand shock loads |
| D. | All of these |
| Answer» E. | |
| 471. |
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 | |
| 472. |
The stress induced in the belt is, |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Direct shear stress |
| D. | Torsional shear stress |
| Answer» B. Compressive stress | |
| 473. |
Shaft coupling is used in machinery to |
| A. | Introduce mechanical flexibility |
| B. | Introduce protection against over loads |
| C. | Reduce the transmission of shock loads |
| D. | All of these |
| Answer» E. | |
| 474. |
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation |
| A. | 124 d |
| B. | 138 d |
| C. | 151 d |
| D. | 168 d |
| Answer» E. | |
| 475. |
Stress concentration factor is defined as the ratio of |
| A. | Maximum stress to the endurance limit |
| B. | Nominal stress to the endurance limit |
| C. | Maximum stress to the nominal stress |
| D. | Nominal stress to the maximum stress |
| Answer» D. Nominal stress to the maximum stress | |
| 476. |
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 | |
| 477. |
The value of stress concentration factor depends upon |
| A. | Material and geometry of the part |
| B. | Geometry of the part |
| C. | Material of the part |
| D. | None of these |
| Answer» E. | |
| 478. |
Which of the following statement is correct, for two shafts connected in parallel? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 479. |
At low temperatures (say 75°C) the notched bar impact value of steel |
| A. | Increases markedly |
| B. | Decreases markedly |
| C. | Remain same |
| D. | Depends on heat treatment carried out |
| Answer» C. Remain same | |
| 480. |
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as |
| A. | Both the ends fixed |
| B. | Both the ends hinged |
| C. | One end fixed and the other end hinged |
| D. | One end fixed and the other end free |
| Answer» E. | |
| 481. |
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 | |
| 482. |
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be |
| A. | τ/2 |
| B. | τ |
| C. | 2 τ |
| D. | 4 τ |
| Answer» C. 2 τ | |
| 483. |
In nitrated parts, the origins of the fatigue cracks will occur at |
| A. | Surface |
| B. | Just below the surface |
| C. | Within the core |
| D. | None of the above |
| Answer» E. | |
| 484. |
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called |
| A. | Working depth |
| B. | Clearance |
| C. | Backlash |
| D. | Face width |
| Answer» D. Face width | |
| 485. |
The included angle for the British Association thread is |
| A. | 29° |
| B. | 55° |
| C. | 47.3° |
| D. | 60° |
| Answer» D. 60° | |
| 486. |
All stresses produced in a belt are |
| A. | Compressive stresses |
| B. | Tensile stresses |
| C. | Both tensile and compressive stresses |
| D. | Shear stresses |
| Answer» C. Both tensile and compressive stresses | |
| 487. |
Cap 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 parts |
| D. | Provided with detachable caps |
| Answer» B. Slotted for a screw driver and generally used with a nut | |
| 488. |
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by |
| A. | Increasing the length of bar |
| B. | Decreasing the cross-sectional area of the bar |
| C. | Decreasing the modulus of elasticity of the bar |
| D. | All of the above |
| Answer» E. | |
| 489. |
In a steam engine, the valve rod is connected to an eccentric rod by means of |
| A. | Cotter joint |
| B. | Knuckle joint |
| C. | Universal joint |
| D. | Flange coupling |
| Answer» C. Universal joint | |
| 490. |
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 | |
| 491. |
In a marine flange coupling, the pitch circle diameter of bolts is taken as |
| A. | 1.2 d |
| B. | 1.6 d |
| C. | 2 d |
| D. | 2.5 d |
| Answer» C. 2 d | |
| 492. |
The process extensively used for making bolts and nuts is |
| A. | Hot piercing |
| B. | Extrusion |
| C. | Cold peening |
| D. | Cold heading |
| Answer» E. | |
| 493. |
The resultant axial load on a bolt depends upon |
| A. | External load applied |
| B. | Initial tension due to tightening of the bolt |
| C. | Relative elastic yielding of the bolt and the connected members |
| D. | All of the above |
| Answer» E. | |
| 494. |
In a multiple V-belt drive, if one of the belts break, then |
| A. | Only the broken belt is replaced |
| B. | The entire set of belts is replaced |
| C. | The broken belt and the belt on either side of it, is replaced |
| D. | The broken belt need not to be replaced |
| Answer» C. The broken belt and the belt on either side of it, is replaced | |
| 495. |
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. | |
| 496. |
Tapered roller bearings can take |
| A. | Axial load only |
| B. | Both radial and axial loads and the ratio of these being greater than unity |
| C. | Radial load only |
| D. | Both radial and axial loads and the ratio of these being less than unity |
| Answer» C. Radial load only | |
| 497. |
Basic hole is one |
| A. | Whose upper deviation is zero |
| B. | Whose lower deviation is zero |
| C. | Whose lower as well as upper deviations are zero |
| D. | Does not exist |
| Answer» C. Whose lower as well as upper deviations are zero | |
| 498. |
In radial bearings, the load acts __________ to the axis of rotation. |
| A. | Parallel |
| B. | Perpendicular |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 499. |
Which of the following material has the maximum ductility? |
| A. | Copper |
| B. | Mild steel |
| C. | Aluminium |
| D. | Zinc |
| Answer» C. Aluminium | |
| 500. |
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 | |