The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.

A circular wheel 28 inches in diameter rotates the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minutes does the larger wheel make in terms of x?

A

12x

B

24x

C

36x

D

48x

A wheel that has 6 cogs is meshed with a wheel of 14 cogs. When the smaller wheel has made 21 revolutions the number of revelution made by the larger wheel is --

A

4

B

9

C

12

D

49

A circular wheel 28 inches in diameter rotates (moves) the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minute does the larger wheel make in terms of x?

A

12x

B

48x

C

24x

D

36x

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

A

Remain same

B

Decrease

C

Increase

D

None of the above

A wheel that had 6 cogs in meshed with a larger wheel if 14 cogs. When the smaller wheell had made 21 revolutions, the number wheel will be-

A

5

B

8

C

10

D

9

The fundamental equation for correct steering is (where $$\varphi $$ and $$\alpha $$ = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles and d = Wheel base)

A

$$\sin \varphi + \sin \alpha = \frac{{\text{b}}}{{\text{c}}}$$

B

$$\cos \varphi - \sin \alpha = \frac{{\text{c}}}{{\text{b}}}$$

C

$$\cot \varphi - \cot \alpha = \frac{{\text{c}}}{{\text{b}}}$$

D

$$\tan \varphi + \cot \alpha = \frac{{\text{b}}}{{\text{c}}}$$

The ratio of the net work obtained from the gas turbine plant to the turbine work is known as

A

Compression ratio

B

Work ratio

C

Pressure ratio

D

None of these

The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)

A

πd

B

πdn

C

πdn sinα

D

πdn cosα

A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

A

Same

B

Lower

C

Higher

D

None of these

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

A

Increases

B

Decreases

C

First increases and then decreases

D

First decreases and then increases

The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.

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