#### Electrical engineering

• ( 1 ) The amount of heat energy per kilogram that must be added or removed when a substance changes from one phase to another.

• 1) specific heat
• 2) heat of expansion
• 3) latent heat
• 4) useful heat
• Discussion in forum
Solution :

discussion

• ( 2 ) The change in physical size of a substance when its temperature changes.

• 1) intensive property
• 2) extensive property
• 3) volume expansion
• 4) thermal expansion
• Discussion in forum
Solution :

discussion

• ( 4 ) A plot of pressure vs. temperature for a given substance showing the various phases possible for that particular substance.

• 1) Phase diagram
• 2) P-T diagram
• 3) Wein Diagram
• 4) Histogram
• Discussion in forum
Solution :

discussion

• ( 5 ) _________ is the grand total of all energies inside a substance.

• 1) Internal Energy
• 2) Grand Energy
• 3) Atomic Energy
• 4) Elemental Energy
• Discussion in forum
Solution :

discussion

• ( 6 ) _________ the very small KE still present in molecules at absolute zero temperature.

• 1) internal KE
• 2) Atomic kinetic energy
• 3) Zero-Point Energy
• 4) Subliminal Energy
• Discussion in forum
Solution :

discussion

• ( 7 ) When a solid melts,

• 1) the temperature of the substance increases.
• 2) the temperature of the substance decreases.
• 3) heat leaves the substance.
• 4) heat enters the substance.
• Discussion in forum
Answer : 4) heat enters the substance.
Solution :

discussion

Answer : 4) heat enters the substance.

• ( 8 ) Which of the following is the formula for thermal resistance?

• 1) Thickness of material/ thermal conductivity of material
• 2) 2(thickness of material)/thermal conductivity of material
• 3) Thickness of material/ 2(thermal conductivity of material)
• 4) Thickness of material x thermal conductivity of material
• Discussion in forum
Answer : 1) Thickness of material/ thermal conductivity of material
Solution :

discussion

Answer : 1) Thickness of material/ thermal conductivity of material

• ( 9 ) The coefficient of performance (COP) is the ratio between the:

• 1) Power consumption in watts and heat absorbed per hour
• 2) Heat absorbed per hour and the power consumption in watts
• 3) Work required and the absorbed heat
• 4) Absorbed heat and work required
• Discussion in forum
Answer : 4) Absorbed heat and work required
Solution :

discussion

Answer : 4) Absorbed heat and work required

• ( 10 ) What predicts the approximate molar specific heat at high temperatures from the atomic weight?

• 1) Third law of thermodynamics
• 2) Law of Dulong and Petit
• 3) Mollier diagram
• 4) Pressure-enthalpy diagram
• Discussion in forum
Answer : 2) Law of Dulong and Petit
Solution :

discussion

Answer : 2) Law of Dulong and Petit