Question: Heat is transferred simultaneously by condition, convection and radiation_____________?

• 1. inside boiler furnaces
• 2. during melting of ice
• 3. through the surface of the insulted pipe carrying steam
• 4. from refrigerator coils to freezer of a refrigerator

Question: For the transmission of heat from one body to another__________?

• 1. temperature of the two bodies must be different
• 2. both bodies must be solids
• 3. both bodies must be in contact
• 4. at least one of the bodies must have some source of heating

Question: A perfect black body is one that_____________?

• 1. transmits all incident radiations
• 2. absorbs all incident radiations
• 3. reflects all incident radiations
• 4. absorbs, reflects and transmits all incident radiations

Question: When a body reflects entire radiation incident on it, then it is known as____________?

• 1. white body
• 2. grey body
• 3. black body
• 4. transparent body

Question: is used for heating non-conducting materials?

• 1. Eddy current heating
• 2. Arc heating
• 3. Induction heating
• 4. Dielectric heating

Question: Which of the following heating methods has maximum power factor ?

• 1. Arc heating
• 2. Dielectric heating
• 3. Induction heating
• 4. Resistance heating

Question: Which of the following is an advantage of heating by electricity ?

• 1. Quicker operation
• 2. Higher efficiency
• 3. Absence of flue gases
• 4. All of the above

Question: method has leading power factor____________?

• 1. Resistance heating
• 2. Dielectric heating
• 3. Arc heating
• 4. Induction heating

Question: Which of the following methods of heating is not dependent on the frequency of supply ?

• 1. Induction heating
• 2. Dielectric heating
• 3. Electric resistance heating
• 4. All of the above

Question: Average resistance of human body is____________?

• 1. 500 ohms
• 2. 1000 ohms
• 3. 1500 ohms
• 4. 2000 ohms