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4

The width of the pulley should be __________ width of the belt.

A. Equal to

B. Less than

C. Greater than

D. None of these

Correct Answer :

C. Greater than


Related Questions

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4

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

A. 0.2

B. 0.25

C. 0.50

D. 0.6

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4

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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4

The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A. Heavier

B. Lighter

C. Moderate

D. None of these

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4

Taper usually provided on cotter is

A. 1 in 5

B. 1 in 10

C. 1 in 24

D. 1 in 40

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4

The backlash for spur gears depends upon

A. Module

B. Tooth profile

C. Both module and pitch line velocity

D. Pitch line velocity

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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

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

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

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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4

For hardening alloy steels and high speed steels, they are heated to

A. 1100 to 1300°C

B. 1300 to 1500°C

C. 500 to 600°C

D. 700 to 900°C

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4

Which of the following statement is correct?

A. The distance from a point on one thread to the corresponding point on the next thread is called pitch

B. The distance which a screw thread advances axially in one rotation of the nut is called lead

C. In single start threads, lead is equal to pitch

D. All of the above

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4

For same pulley diameters, center distance, belt speed and belt and pulley materials,

A. Open belt drive transmits more power than crossed belt drive

B. Crossed belt drive transmits more power than open belt drive

C. Open and crossed belt drives transmit same power

D. Power transmission does not depend upon open and crossed types of constructions

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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

Brittle coating technique is used for

A. Determining brittleness

B. Protecting metal against corrosion

C. Protecting metal against wear and tear

D. Experimental stress analysis

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4

In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

A. T₁/T₂ = μθ × n

B. T₁/T₂ = (μθ)n

C. T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n

D. T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

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4

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

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4

The material used for brake lining should have __________ coefficient of friction.

A. Low

B. High

C. Moderate

D. None of these

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4

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

A. d

B. 1.25 d

C. 1.5 d

D. 1.75 d

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4

For general industrial machinery, the ratio of the length of journal to its diameter is taken as

A. 0.5 to 1

B. 1 to 2

C. 3 to 5

D. 5 to 10

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4

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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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

A steel containing __________ 0.8% carbon is known as hypoeutectoid steel.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

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

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4

The material commonly used for crane hooks is

A. Cast iron

B. Wrought iron

C. Mild steel

D. Aluminium

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4

Which of the following statement is correct regarding power screws?

A. The efficiency of a self locking screw can not be more than 50%

B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread

C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

D. (A) and (B) Only

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4

Screws used for power transmission should have

A. Very fine threads

B. High efficiency

C. Low efficiency

D. Strong teeth

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4

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

A. Ring nut

B. Castle nut

C. Sawn nut

D. Jam nut

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4

If a material fails below its yield point, failure would be due to

A. Straining

B. Fatigue

C. Creep

D. Sudden loading

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4

The expression 0.175 - 0.841/T is the Lewis form factor for

A. 14 ½° composite and full depth involute system

B. 20° full depth involute system

C. 20° stub system

D. None of the above

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4

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