Heat Engines Practice

If heat added to the cycle is 40 kJ and the one rejected is 20 kJ then the efficiency of the cycle will be

• 40%

• 50%

• 60%

• 100%

Tags

NGSS.HS-PS3-4

In general, thermal efficiency of petrol engine is approximately ___

• 5% - 15%

• 20% - 30%

• 40% - 50%

• 60% - 70%

In a heat engine, 750J is drawn from the hot reservoir, and 400J is released to the cold reservoir.

How much work is done by the engine?

• 300 J

• 350 J

• 1150 J

• 0

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

A heat engine does a work of 220J when receiving 600J of heat. How much energy is emitted through the exhaust?

• 380 J

• 820 J

• 480 J

• 880 J

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

A heat engine does 100 J of work, and emits 100 J to the cold reservoir. What is the efficiency of the engine?

• 50%

• 33%

• 20%

• 100%

Tags

NGSS.HS-PS3-4

300 J is emitted to the cold reservoir from a heat engine that does a work of 180J.

How much is the energy received from the hot reservoir?

• 120 J

• 480 J

• 360 J

• 580J

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

How much energy is added to a gas that does 200J of work and has a 750J change in thermal energy?

• 950 J

• 550 J

• 1050 J

Tags

NGSS.HS-PS3-1

750J of heat is added to an isolated gas, the gos does a work of 230J. How much is the change in the gas thermal energy?

• 750 J

• 520 J

• 980 J

• 620 J

Tags

NGSS.HS-PS3-1

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

• 5%

• 50%

• 55%

• 100%

Tags

NGSS.MS-PS3-5

In energy transformations, "wasted energy" usually takes what form?

• heat
• chemical energy
• light
• sound waves

Tags

NGSS.HS-PS3-4