Untitled Presentation

Open Ended

What is the definition of a thermal engine as described in the text?

Open Ended

Explain the relationship between the mass of the fuel and the heat produced during combustion.

Multiple Choice

What are the two main categories of fuels based on their state of aggregation?

• Solid fuels

• Liquid fuels

• Gaseous fuels

• All of the above

Multiple Choice

What is the solid fuel mentioned in the problem?

• alcohol

• methane

• wood

• petrol

Multiple Choice

A steam engine absorbs 690 J and releases 372 J in each cycle. What is the engine's efficiency?

• 0.46

• 0.69

• 0.64

• 0.54

Multiple Choice

5.5.3

The steam engine on an old river boat burns coal to release 12,345 J of energy. If the engine produces 6789J of work, what was the efficiency of the engine?

• 75 %

• 25 %

• 189%

• 55%

Open Ended

Ce masă de motorină a fost consumată de un motor Diesel cu randamentul de 40%, dacă lucrul mecanic efectuat a fost de 8.500.000 J ? (q=42.000Kj/Kg)

Multiple Choice

Fiecare combustibil este caracterizat de o constantă de material, numită…..

• putere calorică

• căldura

• masa

• Temperatura

Multiple Choice

Căldura degajată de un combustibil prin ardere depinde de…….. combustibilul

• culoarea

• masa

• temperatura

• climă

Multiple Choice

Calculați cantitatea de motorină necesară obținerii unei călduri de Q=100 KJ (q=42.000Kj/Kg)

• 2 kg

• 2000 Kg

• 0,00238 Kg

• 2,38Kg

Multiple Choice

Cât este căldura degajată prin arderea a 2 kg de turbă? Se dă puterea calorică a turbinei de 15.000 kJ/kg.

• 30 J

• 30.000 kJ

• 300 J

• 30.000 J

Multiple Choice

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
$$efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100$$  

• 100%

• 80%

• 40%

• 10%

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident