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The efficiency of an autmobile engine is 20% and it operates at 90 cycle per second. If it work at the rate of 120 hp, how much heat does the engine absorb per cycle?

4973 J

4450 J

4282 J

4000 J

What will be the work done by the refrigerator if the refrigerator has coefficient of performance = 4 and extracts heat from cold chamber at a rate of 252J per cycle?

-63 J

+63 J

-53 J

+53 J

What will be the minimum rate at which energy must be supplied to the heat pump, discharging heat inside a house, when the outside temperature is –10oC and the interior is to be kept at 22oC? (It is necessary to deliver heat at the rate of 16 k W to make up for normal heat losses.)

1.7 kW

16 kW

15 kW

2.7 kW

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is: (1 L atm =101.32J)

-6 J

-608 J

+304 J

-304 J

Adiabatic reversible expansion of a monatomic gas (M) and a diatomic gas (D) at an initial temperature T1 has been carried out independently from initial volume V1 to final volume V2. The final temperature (TM for monatomic gas and TD for diatomic gas) attained will be:

TM =TD >Ti

TM TM >TD >Ti

TM =TD =Ti

Two moles of a monatomic perfect gas initially at 4.0 bar and 47oC undergoes reversible expansion in an insulated container. The temperature at which the pressure reduces to 3.0 bar is:

200 K

285 K

310 K

320 K

One mole of an ideal gas (Cv =20 J K-1 mo-1) initially at STP is heated at constant volume to twice the initial temperature. For the process, W and q will be:

W =0; q =5.46 kJ

W =0;q= 0

W= -5.46 kJ; q= 5.46 kJ

W =5.46 kJ; q=5.46 kJ

A Carnot engine absorbs 6000 kJ of heat from a source at 600 K. If only 50% of useful work is obtained, sink has been placed at:

27oC

300oC

127oC

327oC

Select correct statement:

At absolute zero of the sink work obtained is maximum

Kinetic energy of a molecule is zero at 0oC

Volume of one mole of gas is 22.4 L at 0 K

All of the above

Heat obtained due to expansion of 1 mol of H2 gas at 1000 K from 10 L to 100 L under isothermal reversible condition is absorbed by an engine having a sink at 300 K. Useful work obtained is:

-1382 cal

-3224 cal

1382 cal

3224 cal

Efficiency of a Carnot’s engine is 100% when:

Sink is placed at 0oC

Sink is placed at 0 k

Source is placed at 100oC

Source is placed at 400oC

4973 J

4450 J

4282 J

4000 J

What will be the work done by the refrigerator if the refrigerator has coefficient of performance = 4 and extracts heat from cold chamber at a rate of 252J per cycle?

-63 J

+63 J

-53 J

+53 J

What will be the minimum rate at which energy must be supplied to the heat pump, discharging heat inside a house, when the outside temperature is –10oC and the interior is to be kept at 22oC? (It is necessary to deliver heat at the rate of 16 k W to make up for normal heat losses.)

1.7 kW

16 kW

15 kW

2.7 kW

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is: (1 L atm =101.32J)

-6 J

-608 J

+304 J

-304 J

Adiabatic reversible expansion of a monatomic gas (M) and a diatomic gas (D) at an initial temperature T1 has been carried out independently from initial volume V1 to final volume V2. The final temperature (TM for monatomic gas and TD for diatomic gas) attained will be:

TM =TD >Ti

TM TM >TD >Ti

TM =TD =Ti

Two moles of a monatomic perfect gas initially at 4.0 bar and 47oC undergoes reversible expansion in an insulated container. The temperature at which the pressure reduces to 3.0 bar is:

200 K

285 K

310 K

320 K

One mole of an ideal gas (Cv =20 J K-1 mo-1) initially at STP is heated at constant volume to twice the initial temperature. For the process, W and q will be:

W =0; q =5.46 kJ

W =0;q= 0

W= -5.46 kJ; q= 5.46 kJ

W =5.46 kJ; q=5.46 kJ

A Carnot engine absorbs 6000 kJ of heat from a source at 600 K. If only 50% of useful work is obtained, sink has been placed at:

27oC

300oC

127oC

327oC

Select correct statement:

At absolute zero of the sink work obtained is maximum

Kinetic energy of a molecule is zero at 0oC

Volume of one mole of gas is 22.4 L at 0 K

All of the above

Heat obtained due to expansion of 1 mol of H2 gas at 1000 K from 10 L to 100 L under isothermal reversible condition is absorbed by an engine having a sink at 300 K. Useful work obtained is:

-1382 cal

-3224 cal

1382 cal

3224 cal

Efficiency of a Carnot’s engine is 100% when:

Sink is placed at 0oC

Sink is placed at 0 k

Source is placed at 100oC

Source is placed at 400oC

Questions are on Carnot' s engine, refrigerator, adiabatic and isothermal expansion etc---all very important topics for students of AIEEE,IIT JEE, AIPMT

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