When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A

Increase

B

Decrease

C

Remain unaffected

D

Other factors control it

For perfect intercooling in a two stage compressor

A

$$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}}$$

B

$$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}} = \frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$

C

$${{\text{p}}_1} = {{\text{p}}_3}$$

D

$${{\text{p}}_1} = {{\text{p}}_2}{{\text{p}}_3}$$

For perfect intercooling in a three stage compressor

A

$$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_3}}}$$

B

$$\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_2}}}$$

C

$${{\text{p}}_1}{{\text{p}}_2} = {{\text{p}}_3}{{\text{p}}_4}$$

D

$${{\text{p}}_1}{{\text{p}}_3} = {{\text{p}}_2}{{\text{p}}_4}$$

The temperature of air at the beginning of the compression stroke is ________ the atmospheric temperature.

A

Equal to

B

Less than

C

More than

D

None of these

Multistage compression of air as compared to single stage compression offers the advantage of

A

Power saving per unit weight of air delivered

B

Moisture elimination in the inter-stage cooler

C

Increased volumetric efficiency

D

All of the above

The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.

A

Equal to

B

Less than

C

More than

D

None of these

In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

A

consolidated drained test

B

consolidated undrained test

C

unconsolidated drained test

D

unconsolidated undrained test

A train leaving Dhaka at 6am reaches Mymansing at 10 am and another train leaving Mymensing at 7 am and reaches Dhaka at 12 noon. At what time the two trains running opposite direction should meet?

A

7.40am

B

8.40am

C

9.20am

D

9.40am

The number of flights leaving a certain airport doubles during every one-hour period between its 9 am opening and noon; afternoon, the number of flights leaving from the airport doubles during every two-hour period. If 4 flights left from the airport between 9 am and 10 am, how many flights left the airport between 2 pm and 4 pm?

A

128

B

32

C

48

D

64

The advantage of multistage compression over single stage compression is

A

Lower power consumption per unit of air delivered

B

Higher volumetric efficiency

C

Decreased discharge temperature

D

All of the above

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

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