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4

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

A. T sec3φ

B. T sec²φ

C. T/sec3φ

D. T cosecφ

Correct Answer :

A. T sec3φ


Related Questions

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4

A tube has the following advantage over pipe

A. Lighter and easier to handle

B. Greater shock absorption

C. Smoother inside walls

D. All of the above

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4

In hydrostatic 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 is used for lubrication

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4

Which of the following statement is wrong?

A. The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets

B. The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole

C. The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm

D. According to I.B.R., the thickness of butt strap shall not be less than 5 mm

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4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

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4

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater

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4

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

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4

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel

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4

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

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4

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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4

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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4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to

A. P1 - P2

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

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4

Oil in journal bearing should be applied at the point where load is

A. Nil or lightest

B. Maximum

C. Average

D. Any one of the above

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4

Crushing resistance required to crush the rivet per pitch length is

A. p.d.σc

B. p.t.σc

C. n.d.t.σc

D. (p - d) t.σc

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4

The ultimate strength of steel in tension in comparison to shear is in the ratio of

A. 1 : 1

B. 2 : 1

C. 3 : 2

D. 2 : 3

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4

The velocity factor for ordinary cut gears operating at velocities upto 12.5 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

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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4

The coefficient of friction in belt drive depends upon

A. Material of belt

B. Material of pulley

C. Materials of belt and pulley

D. Belt velocity

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4

The temperature at which the new grains are formed in the metal is known as

A. Lower critical temperature

B. Upper critical temperature

C. Recrystallisation temperature

D. None of these

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4

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

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4

Oldham coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Which have lateral misalignment

D. Whose axes intersect at a small angle

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4

In V-belt drive, belt touches

A. At bottom

B. At sides only

C. Both at bottom and sides

D. Could touch anywhere

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4

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

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4

The pitch diameter is the __________ diameter of an external or internal screw thread.

A. Effective

B. Smallest

C. Largest

D. None of these

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4

The bearings of medium series have capacity __________ over the light series.

A. 10 to 20 %

B. 20 to 30 %

C. 30 to 40 %

D. 40 to 50 %

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4

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

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4

A single strap butt joint is always in __________ shear.

A. Single

B. Double

C. Triple share

D. None of these

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4

The piston pin bearings in heavy duty diesel engines are

A. Needle roller bearings

B. Tapered roller bearings

C. Spherical roller bearings

D. Cylindrical roller bearings

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4

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)]

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4

A localised compressive stress at the area of contact between two members is known as

A. Bending stress

B. Shear stress

C. Tensile stress

D. Bearing stress

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4

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