Supercharging is the process of __________

Which of the following remarks pertaining to supercharging of IC engines are correct? 1. Ideal supercharging increases the output, but decreases the thermal efficiency slightly 2. The indicated mean effective pressure and mechanical efficiency increase with supercharging 3. The permissible amount of supercharging depends on the compression ratio, air-fuel mixture and design of engine 4. Engine friction losses increase with supercharging

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

1, 2 and 4 only

D

2, 3 and 4 only

Consider the following statements regarding supercharging of CI engines: 1. Supercharging results in a quieter and smoother operation of a CI engine 2. Supercharging of a CI engine requires an increase in valve overlap 3. The limit of supercharging for a CI engine is reached by thermal and mechanical loading Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Consider the following statements pertaining to supercharging of engines: 1. The power output for a given engine increases 2. The loss of power due to altitude is compensated 3. The increase in supercharging pressure decreases the tendency to detonate in spark ignition engines 4. The mechanical efficiency of supercharged engines is quite high compared to naturally aspirated engines Which of the above statements are correct?

A

1 and 3

B

3 and 2

C

2 and 3

D

1 and 2

Supercharging is the process of

A

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

B

Providing forced cooling air

C

Injecting excess fuel for raising more loads

D

Supplying compressed air to remove combustion products fully

Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.

A

Equal to

B

Less than

C

Greater than

D

None of these

The object of supercharging the engine is __________

A

to increase the power output of an engine when greater power is required

B

to reduce mass of the engine per brake power

C

to reduce space occupied by the engine

D

all of the mentioned

Two processes X and Y need to access a critical section. Consider the following synchronization construct used by both the processes Process ? /* other code for process ? */ while(true) { varP = true; while(varQ == true) { /* Critical Section */ varP = false; } } /* other code for process ?? */ Process ? /* other code for process ? */ while(true) { varQ = true; while(varP == true) { /* Critical Section */ varQ = false; } } /* other code for process ? */ Here, varP and varQ are shared variables and both are initialized to false. Which one of the following statements is true?

A

The proposed solution prevents deadlock but fails to guarantee mutual exclusion

B

The proposed solution guarantees mutual exclusion but fails to prevent deadlock

C

The proposed solution guarantees mutual exclusion and prevents deadlock

D

The proposed solution fails to prevent deadlock and fails to guarantee mutual exclusion

The reason for supercharging in any engine is to

A

Increase efficiency

B

Increase power

C

Reduce weight and bulk for a given output

D

Effect fuel economy

A compressor mostly used for supercharging of I.C. engines is

A

Radial flow compressor

B

Axial flow compressor

C

Roots blower

D

Reciprocating compressor

Supercharging is essential in

A

Diesel engines

B

Gas turbines

C

Petrol engines

D

Aircraft engines

Supercharging is the process of __________

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