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4

A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Gib head key

Correct Answer :

C. Flat saddle key


Related Questions

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4

A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

A. 3.6 N/mm² compression

B. 3.6 N/mm² tension

C. 7.2 N/mm² compression

D. 7.2 N/mm² tension

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4

In Vickers hardness testing, the pyramid indentor apex is

A. 40°

B. 122°

C. 136°

D. 152°

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4

For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

A. 8

B. 6

C. 4

D. 10

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4

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

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

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4

An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load W. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

A. One-eighth

B. One-fourth

C. One-half

D. Double

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4

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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4

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

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4

Stress concentration in static loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors

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4

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1-3 m/s

B. 3-15 m/s

C. 15-30 m/s

D. 30-50 m/s

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4

Lewis form factor for 14 ½° 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

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4

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

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4

The included angle for the British Association thread is

A. 29°

B. 55°

C. 47.3°

D. 60°

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4

According to Indian standards, total numbers of fundamental deviations are

A. 10

B. 15

C. 20

D. 25

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4

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

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4

Form coefficient of spring is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Concerned with strength of wire of spring

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4

Which of the following statement is correct?

A. A parallel sunk key is a taperless key

B. A parallel sunk key may be rectangular or square in cross-section

C. A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft

D. All of the above

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4

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

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4

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)

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4

When spring index increases, the value of Wahl's stress factor

A. Increases linearly

B. Decreases linearly

C. Remains same

D. Increases exponentially

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4

Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

In radial bearings, the load acts __________ to the axis of rotation.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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4

The piston rod of a steam engine is usually connected to the crosshead by means of

A. Bolted joint

B. Knuckle joint

C. Cotter joint

D. Universal joint

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4

The crest diameter of a screw thread is same as

A. Major diameter

B. Minor diameter

C. Pitch diameter

D. Core diameter

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4

A spring is used to

A. Measure forces

B. Apply forces

C. Store energy

D. All of these

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4

The radial distance of a tooth from the pitch circle to the top of the tooth is called

A. Addendum

B. Dedendum

C. Clearance

D. Working depth

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4

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

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4

The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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4

In the assembly of pulley, key and shaft

A. Pulley is made the weakest

B. Key is made the weakest

C. Key is made the strongest

D. All the three are designed for equal strength

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4

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