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For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)?

LohaHridoy
  1. $$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$
  2. $$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
  3. $$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$
  4. $$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

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Answer: Option 4

Let'

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When the primary direct crank of a reciprocating engine makes an angle of $$\theta $$ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.?

Answer: Option 3 Let'

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A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will?

Answer: Option 3 Let'

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The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is?

Answer: Option 2 The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is Brake pedal, vacuum servo mechanism, master cylinder,...

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Answer: Option 3 Let'

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The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)?

Answer: Option 1 Let'

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In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where $$\mu $$ = Coefficient of friction between the blocks and the drum, $$\theta $$ = Semi-angle of each block subtending at the center of drum and n = Number of blocks)?

Answer: Option 4 Let'

1 Answers 1 views
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 $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)?

Answer: Option 2 Let'

1 Answers 1 views
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where $$\mu $$ = Coefficient of friction between the blocks and the drum, $$\theta $$ = Semi-angle of each block subtending at the centre of drum and n = Number of blocks)?

Answer: Option 4 Let'

1 Answers 1 views
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)?

Answer: Option 1 Let'

1 Answers 2 views
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)?

Answer: Option 4 The brake power (B.P.) of the engine is given by -B.P = (Wl × 2πN)/60 watts -B.P = [(W - S) πDN]/60 watts - B.P = [(W - S) π...

1 Answers 9 views

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