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

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A

Twice

B

Four times

C

Eight times

D

Sixteen times

You are about to install a second IDE hard drive in a PC that has only one IDE adapter. Your first hard drive will still be the boot drive. How should the second drive be configured?

A

as a master

B

as a secondary

C

as a slave

D

as a primary

E

as auto-select

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 variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A

P, Q and R

B

P and R

C

R and S

D

P, R and S

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 natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)

A

$$2\pi \sqrt {\frac{{\text{q}}}{I}} $$

B

$$2\pi \sqrt {{\text{q}}I} $$

C

$$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$

D

$$\frac{1}{{2\pi }}$$

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)

A

$${\text{r}}\sin \varphi $$

B

$${\text{r}}\cos \varphi $$

C

$${\text{r}}\tan \varphi $$

D

$$\frac{{\text{r}}}{2}\cos \varphi $$

The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as

A

Bending moment

B

Twisting moment

C

Torsional rigidity

D

Flexural rigidity

In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

A

Work factor

B

Slip factor

C

Degree of reaction

D

Pressure coefficient

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

A

Mechanical efficiency

B

Volumetric efficiency

C

Isothermal efficiency

D

Adiabatic 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

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