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.
| 651. |
The wear load should be __________ the dynamic load. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 652. |
The static tooth load should be __________ the dynamic load. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 653. |
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be |
| A. | 0.96 |
| B. | 0.97 |
| C. | 0.98 |
| D. | 0.99 |
| Answer» B. 0.97 | |
| 654. |
If a bearing is designated by the number 305, it means that the bearing is of |
| A. | Medium series whose bore is 5 mm |
| B. | Medium series whose bore is 25 mm |
| C. | Light series whose bore is 25 mm |
| D. | Light series whose bore is 5 mm |
| Answer» C. Light series whose bore is 25 mm | |
| 655. |
In a full journal bearing, the angle of contact of the bearing with the journal is |
| A. | 120° |
| B. | 180° |
| C. | 270° |
| D. | 360° |
| Answer» E. | |
| 656. |
Belt slip may occur due to |
| A. | Heavy load |
| B. | Loose belt |
| C. | Driving pulley too small |
| D. | All of the above |
| Answer» E. | |
| 657. |
The pipe joint mostly used for pipes carrying water at low pressures is |
| A. | Socket joint |
| B. | Nipple joint |
| C. | Union joint |
| D. | Spigot and socket joint |
| Answer» B. Nipple joint | |
| 658. |
In leaf springs, the longest leaf is known as |
| A. | Master leaf |
| B. | Lower leaf |
| C. | Upper leaf |
| D. | None of these |
| Answer» B. Lower leaf | |
| 659. |
A feather key is generally |
| A. | Loose in shaft and tight in hub |
| B. | Tight in shaft and loose in hub |
| C. | Tight in both shaft and hub |
| D. | Loose in both shaft and hub |
| Answer» C. Tight in both shaft and hub | |
| 660. |
Auto frettage is the method of |
| A. | Joining thick cylinders |
| B. | Calculating stresses in thick cylinders |
| C. | Pre-stressing thick cylinders |
| D. | Increasing the life of thick cylinders |
| Answer» D. Increasing the life of thick cylinders | |
| 661. |
In a partial journal bearing, the angle of contact of the bearing with the journal is |
| A. | 120° |
| B. | 180° |
| C. | 270° |
| D. | 360° |
| Answer» B. 180° | |
| 662. |
The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is |
| A. | 7.5 kN |
| B. | 10.6 kN |
| C. | 15 kN |
| D. | 22.5 kN |
| Answer» C. 15 kN | |
| 663. |
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be |
| A. | 0.8 d |
| B. | 1.2 d |
| C. | 1.57 d |
| D. | 1.8 d |
| Answer» D. 1.8 d | |
| 664. |
The dynamic tooth load is due to |
| A. | Inaccuracies of tooth spacing |
| B. | Irregularities in tooth profiles |
| C. | Deflections of teeth under load |
| D. | All of these |
| Answer» E. | |
| 665. |
For a square key made of mild steel, the shear and crushing strength are related as |
| A. | Shear strength is equal to crushing strength |
| B. | Shear strength is greater than crushing strength |
| C. | Shear strength is less than crushing strength |
| D. | None of the above |
| Answer» B. Shear strength is greater than crushing strength | |
| 666. |
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft) |
| A. | d + 17 mm |
| B. | 2d + 13 mm |
| C. | 2d + 20 mm |
| D. | 3.5d |
| Answer» C. 2d + 20 mm | |
| 667. |
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft) |
| A. | d + 17 mm |
| B. | 2d + 13 mm |
| C. | 2d + 20 mm |
| D. | 3.5 d |
| Answer» E. | |
| 668. |
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft) |
| A. | 2 d |
| B. | 3 d |
| C. | 4 d |
| D. | 5 d |
| Answer» C. 4 d | |
| 669. |
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 670. |
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole) |
| A. | Less than 20d |
| B. | Greater than 30d |
| C. | Between 20d and 30d |
| D. | Equal to inside diameter of pipe |
| Answer» D. Equal to inside diameter of pipe | |
| 671. |
In helical bevel gearing, the axes of shafts are __________ and the teeth are curved. |
| A. | Intersecting |
| B. | Non-intersecting and non-parallel |
| C. | Intersecting and non-parallel |
| D. | None of these |
| Answer» C. Intersecting and non-parallel | |
| 672. |
In worm, gears, pitch lead angle is |
| A. | Half the angle between two inclined faces in axial plane |
| B. | The angle between the tangent to the pitch helix and the plane of rotation |
| C. | The angle between the tangent to the pitch helix and an element of the cylinder |
| D. | None of the above |
| Answer» C. The angle between the tangent to the pitch helix and an element of the cylinder | |
| 673. |
If a spring is cut down into two springs, the stiffness of cut springs will be |
| A. | Half |
| B. | Same |
| C. | Double |
| D. | None of the above |
| Answer» D. None of the above | |
| 674. |
When the belt speed increases |
| A. | Power transmitted increases |
| B. | Power transmitted decreases |
| C. | Power transmitted increases to a maximum value and then decreases |
| D. | Power transmitted remains the same |
| Answer» D. Power transmitted remains the same | |
| 675. |
A shaft is subjected to |
| A. | Bending stresses |
| B. | Shear stresses |
| C. | Combined bending and shear stresses |
| D. | All of these |
| Answer» E. | |
| 676. |
A shaft coupling should |
| A. | Be easy to connect or disconnect |
| B. | Transmit full power of the shaft |
| C. | Hold the shafts in perfect alignment |
| D. | All of these |
| Answer» E. | |
| 677. |
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the |
| A. | Thread |
| B. | Middle |
| C. | Shank |
| D. | Head |
| Answer» B. Middle | |
| 678. |
The arms of the pulleys for flat belt drive have |
| A. | Elliptical cross-section |
| B. | Major axis in plane of rotation |
| C. | Major axis twice the minor axis |
| D. | All the three characteristics |
| Answer» E. | |
| 679. |
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used. |
| A. | Rectangular |
| B. | Square |
| C. | Parallel |
| D. | None of these |
| Answer» D. None of these | |
| 680. |
The ball bearings are, usually, made from |
| A. | Low carbon steel |
| B. | High carbon steel |
| C. | Medium carbon steel |
| D. | High speed steel |
| Answer» D. High speed steel | |
| 681. |
A rivet is specified by |
| A. | Shank diameter |
| B. | Length of rivet |
| C. | Type of head |
| D. | Length of tail |
| Answer» B. Length of rivet | |
| 682. |
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that |
| A. | The effect of curvature of the cylinder wall is neglected |
| B. | The tensile stresses are uniformly distributed over the section of the walls |
| C. | The effect of the restraining action of the heads at the end of the pressure vessel is neglected |
| D. | All of the above |
| Answer» E. | |
| 683. |
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of |
| A. | Brown colour |
| B. | Yellow colour |
| C. | White colour |
| D. | Grey colour |
| Answer» E. | |
| 684. |
In order to remove internal stresses produced by hardening the steel, the process usually adopted is |
| A. | Tempering |
| B. | Normalizing |
| C. | Annealing |
| D. | Spheroidizing |
| Answer» B. Normalizing | |
| 685. |
When two helical springs of equal lengths are arranged to form a cluster spring, then |
| A. | Shear stress in each spring will be equal |
| B. | Load taken by each spring will be half the total load |
| C. | Only A is correct |
| D. | Both A and B is correct |
| Answer» E. | |
| 686. |
Which is correct statement? Stress concentration in static 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» B. Very serious in ductile materials and less serious in brittle materials | |
| 687. |
Screws used for power transmission should have |
| A. | Very fine threads |
| B. | High efficiency |
| C. | Low efficiency |
| D. | Strong teeth |
| Answer» C. Low efficiency | |
| 688. |
In case of thick cylinders, the tangential stress across the thickness of cylinder is |
| A. | Maximum at the outer surface and minimum at the inner surface |
| B. | Maximum at the inner surface and minimum at the outer surface |
| C. | Maximum at the inner surface and zero at the outer surface |
| D. | Maximum at the outer surface and zero at the inner surface |
| Answer» C. Maximum at the inner surface and zero at the outer surface | |
| 689. |
Which of the following property is essential for spring materials? |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 690. |
A spring is used to |
| A. | Measure forces |
| B. | Apply forces |
| C. | Store energy |
| D. | All of these |
| Answer» E. | |
| 691. |
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be |
| A. | 15 |
| B. | 17 |
| C. | 21 |
| D. | 25 |
| Answer» C. 21 | |
| 692. |
When the belt is transmitting maximum power, the belt speed should be(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N)) |
| A. | √(Pmax / 2m) |
| B. | √(Pmax / 3m) |
| C. | √(Pmax / m) |
| D. | √(3m /Pmax) |
| Answer» C. √(Pmax / m) | |
| 693. |
The tension on the slack side of the belt is __________ the tension on the tight side of the belt. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 694. |
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to |
| A. | pd/σt |
| B. | pd/2σt |
| C. | pd/3σt |
| D. | pd/4σt |
| Answer» E. | |
| 695. |
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called |
| A. | Plasticity |
| B. | Elasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» E. | |
| 696. |
Set 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. | Similar to stud |
| Answer» D. Similar to stud | |
| 697. |
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle) |
| A. | 2μ sinθ/(θ + sinθ) |
| B. | μ sinθ/(2θ + sin 2θ) |
| C. | 4μ sinθ/(θ + sinθ) |
| D. | 4μ sinθ/(2θ + sin 2θ) |
| Answer» E. | |
| 698. |
The shear modulus of resilience is proportional to |
| A. | Shear stress |
| B. | (Shear stress)² |
| C. | (Shear stress)3 |
| D. | (Shear stress)⁴ |
| Answer» C. (Shear stress)3 | |
| 699. |
Which is positive drive? |
| A. | Flat belt drive |
| B. | V belt drive |
| C. | Crossed belt drive |
| D. | Timing belt |
| Answer» E. | |
| 700. |
In a journal bearing, the load on the bearing is __________ to the axis of the journal. |
| A. | Parallel |
| B. | Perpendicular |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |