Ratio of indicated H.P. and brake H.P. is known as

The ratio of brake power to the indicated power is known as

A

Mechanical efficiency

B

Overall efficiency

C

Indicated thermal efficiency

D

Brake thermal efficiency

The ratio of the brake power to the indicated power is called

A

Mechanical efficiency

B

Overall efficiency

C

Indicated thermal efficiency

D

Volumetric efficiency

The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

A

Compressor efficiency

B

Volumetric efficiency

C

Isothermal efficiency

D

Mechanical efficiency

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

A

Brake pedal, Master cylinder, Brake lines, Vacuum servo mechanism, Brake pads

B

Brake pedal, Vacuum servo mechanism, Master cylinder, Brake lines, Brake pads

C

Brake pedal, Master cylinder, Vacuum servo mechanism, Brake lines, Brake pads

D

Brake pedal, Brake lines, Vacuum servo mechanism, Master cylinder, Brake pads

In recent times, the “dynamic brake system” is becoming popular in modern railways. The dynamic brake system coverts Kinetic energy to________:

A

Potential energy

B

Electricity

C

Sound energy

D

Magnetic energy

The ratio of heat equivalent to brake power to the energy supplied in steam is known as

A

Mechanical efficiency

B

Overall efficiency

C

Indicated thermal efficiency

D

Brake thermal efficiency

Ratio of indicated h.p. to shaft h.p. in known as

A

Compressor efficiency

B

Isothermal efficiency

C

Volumetric efficiency

D

Mechanical efficiency

The ratio of the indicated thermal efficiency to the air standard efficiency is known as

A

Mechanical efficiency

B

Overall efficiency

C

Volumetric efficiency

D

Relative efficiency

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)

A

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = \mu \theta {\text{n}}$$

B

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 - \mu \tan \theta }}{{1 + \mu \tan \theta }}} \right)^{\text{n}}}$$

C

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\mu \theta } \right)^{\text{n}}}$$

D

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 + \mu \tan \theta }}{{1 - \mu \tan \theta }}} \right)^{\text{n}}}$$

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)

A

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_{\text{2}}}}} = \mu \theta \times {\text{n}}$$

B

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\mu \theta } \right)^{\text{n}}}$$

C

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 - \mu \tan \theta }}{{1 + \mu \tan \theta }}} \right)^{\text{n}}}$$

D

$$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 + \mu \tan \theta }}{{1 - \mu \tan \theta }}} \right)^{\text{n}}}$$

Ratio of indicated H.P. and brake H.P. is known as

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