Carnot Theorem - Mechworlz

Carnot Theorem

1 / 10

If the temperature of the cold reservoir in a Carnot engine is decreased while keeping the hot reservoir temperature constant, the efficiency will:

Decrease

Remain the same

Increase

Become zero

2 / 10

Which of the following is NOT a feature of the Carnot cycle?

All processes are reversible.

It operates between two fixed temperature reservoirs.

It involves heat transfer at constant pressure.

It includes adiabatic processes

3 / 10

A Carnot engine absorbs 1000 J of heat from a hot reservoir at 500 K and rejects heat to a cold reservoir at 250 K. How much work does it produce

250 J

500 J

750 J

1000 J

4 / 10

What is the significance of the Carnot cycle in thermodynamics?

It sets the upper limit for the efficiency of all heat engines.

It represents the least efficient cycle.

It is used in all practical heat engines.

It eliminates the need for heat reservoirs.

5 / 10

According to the Carnot Theorem, why can’t a real heat engine surpass the efficiency of a Carnot engine?

Real engines operate reversibly.

Real engines have irreversibilities like friction and heat loss.

Real engines use ideal gases.

Real engines operate at constant pressure.

6 / 10

If a Carnot engine operates between 600 K and 300 K, what is its efficiency?

25%

50%

75%

100%

7 / 10

The efficiency of a Carnot engine depends on:

The pressure of the working substance

The temperatures of the hot and cold reservoirs

The volume of the working substance

The type of working substance used

8 / 10

What is a key requirement for a Carnot engine to achieve maximum efficiency?

It must operate irreversibly.

It must operate between two heat reservoirs at constant temperatures.

It must use a real gas as the working substance.

It must have friction in the system.

9 / 10

The Carnot cycle consists of which of the following processes?

Two isothermal and two isobaric processes

Two isothermal and two adiabatic processes

Two isentropic and two isochoric processes

Two adiabatic and two isochoric processes

10 / 10

What does the Carnot Theorem state?

No heat engine can be more efficient than a Carnot engine operating between the same temperature reservoirs.

All heat engines have the same efficiency regardless of the working substance.

A Carnot engine produces no work.

Heat engines can achieve 100% efficiency under ideal conditions

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