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Current Affairs January 2024

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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. Mitre gears

Correct Answer :

D. Mitre gears


Related Questions

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The coefficient of friction between the belt and pulley depends upon the

A. Material of belt and pulley

B. Slip of belt

C. Speed of belt

D. All of these

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According to Indian standard specifications, 100 H6/g5 means that the

A. Basic size is 100 mm

B. Actual size is 100 mm

C. Difference between the actual size and basic size is 100 mm

D. None of the above

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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

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In block brakes, the ratio of shoe width to wheel diameter is taken between

A. 0.1 and 0.25

B. 0.25 and 0.50

C. 0.50 and 0.75

D. 0.75 and 1

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Spring stiffness is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Its ability to absorb shocks

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A leaf spring in automobiles is used

A. To apply forces

B. To measure forces

C. To absorb shocks

D. To store strain energy

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The standard length of the shaft is

A. 6 m

B. 5 m

C. 7 m

D. All of these

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The smallest diameter of an external or internal screw thread is known as

A. Minor diameter

B. Major diameter

C. Pitch diameter

D. None of these

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Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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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)

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A chain drive transmits __________ power as compared to belt drive.

A. More

B. Less

C. Same

D. None of these

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Coaxing is the procedure of increasing

A. Metal strength by cycling

B. Metal hardness by surface treatment

C. Metal resistance to corrosion by coating

D. Fatigue limit by overstressing the metal by successively increasing loadings

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Split nut is a locking device in which

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening screw

C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

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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

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The most important dimension in the design of a nut is

A. Pitch diameter

B. Inside diameter

C. Outside diameter

D. Height

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The material commonly used for machine tool bodies is

A. Mild steel

B. Aluminium

C. Brass

D. Cast iron

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The included angle between the sides of V-belt is

A. 40°

B. 45°

C. 38°

D. 60°

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If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio.

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

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A bolt of uniform strength can be developed by

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

B. Keeping the core diameter smaller than the diameter of the unthreaded portion

C. Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

D. None of the above

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A bolt is designed on the basis of __________ with a large factor of safety.

A. Direct tensile stress

B. Direct compressive stress

C. Direct bending stress

D. Direct shear stress

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The elasticity is the property of a material which enables it to

A. Regains its original shape after deformation when the external forces are removed

B. Draw into wires by the application of a tensile force

C. Resists fracture due to high impact loads

D. Retain deformation produced under load permanently

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The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

A. 2/8

B. 8/2

C. 4/8

D. 8/4

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A flange coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Have lateral misalignment

D. Whose axes intersect at a small angle

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The designation M 33 × 2 of a bolt means

A. Metric threads of 33 numbers in 2 cm

B. Metric threads with cross-section of 33 mm

C. Metric threads of 33 mm outside diameter and 2 mm pitch

D. Bolt of 33 mm nominal diameter having 2 threads per cm

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The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

A. Same in both cases

B. 2 times more

C. 3 times more

D. 4 times more

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A connecting rod is designed as a

A. Long column

B. Short column

C. Strut

D. All of these

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The maximum bending stress in a curved beam having symmetrical section always occur at the

A. Centroidal axis

B. Neutral axis

C. Inside fibre

D. Outside fibre

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A spring is used to

A. Measure forces

B. Apply forces

C. Store energy

D. All of these

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The size of a gear is usually specified by

A. Pressure angle

B. Pitch circle diameter

C. Circular pitch

D. Diametral pitch

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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