Electric Energy Generation Utilization And Conservation Set 2
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This set of Electric Energy Generation Utilization and Conservation Multiple Choice Questions & Answers (MCQs) focuses on Electric Energy Generation Utilization And Conservation Set 2
Q1 | Which of the following is the condition to use two compressors in the refrigeration system?
- the desired temperature is 3°c
- the desired temperature is -3°c
- the desired temperature is -50°c
- the desired temperature is -5°c
Q2 | Centrifugal compressors are used to handle volume of refrigerant.
- small
- medium
- large
- very large
Q3 | Which of the following cooling towers possess maximum heat transfer from air to water?
- natural draft
- mechanical draft
- natural and mechanical draft
- atmospheric draft
Q4 | Which of the following is true about the optimum effective temperature for human comfort?
- same in winter and summer
- not dependent on season
- lower in winter than in summer
- higher in winter than in summer
Q5 | When the heat stored in the body is the human body feels comfortable.
- zero
- infinite
- positive
- negative
Q6 | Room air conditioners and packaged units are examples of
- direct expansion systems
- indirect expansion systems
- chilled water systems
- indirect contraction systems
Q7 | Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty?
- viscous type filters
- dry filter
- spray washers
- electric precipitators
Q8 | The process of extraction of the certain required amount of water from air is known as
- heating
- cooling
- humidification
- dehumidification
Q9 | Which of the following is capable of absorbing excess moisture from the air?
- silica gel
- charcoal
- salts of calcium or ammonia
- activated alumina
Q10 | Magnetic materials are heated with the help of
- hysteresis loss
- electric arc
- electric current
- radiation.
Q11 | In the indirect resistance heating method, heat is delivered to the charge
- direcly
- by radiation
- by convection
- both (b) and (c).
Q12 | Electric ovens using heating elements of........................... can produce temperatures up to 3000°C
- nickel
- graphite
- chromium
- iron.
Q13 | Which of the following heating method is based on the transformer principle ?
- resistance heating
- eddy-current heating
- induction heating
- dielectric heating.
Q14 | Which of the following furnace suffers from pinch effect?
- resistance furnace
- core type induction furnace
- coreless induction furnace
- vertical core type induction furnace.
Q15 | The coreless induction furnace uses high-frequency electric supply in order to obtain high
- flux density
- eddy-current loss
- primary resistance
- power factor.
Q16 | Spot welding is used for
- thin metal sheets
- rough and irregular surfaces
- costings only
- thick sections
Q17 | Which of the following is an advantages of heating by electricity?
- quicker operation
- higher efficiency
- absence of flue gases
- all of the above
Q18 | ...... has the highest value of thermal conductivity.
- copper
- aluminium
- brass
- steel
Q19 | ...... method has leading power factor
- resistance heating
- dielectric heating
- arc heating
- induction heating
Q20 | Which of the following methods of heating is not dependent on the frequency of supply?
- induction heating
- dielectric heating
- electric resistance heating
- all of the above
Q21 | When a body reflects entire radiation incident on it, then it is known as
- white body
- grey body
- black body
- transparent body
Q22 | For the transmission of heat from one body to another
- temperature of the two bodies must be different
- both bodies must be solids
- both bodies must be in contact
- at least one of the bodies must have some source of heating
Q23 | A perfect black body is one that
- transmits all incident radiations
- absorbs all incident radions
- reflects all incident radiations
- absorbs, reflects and transmits all incident radiations
Q24 | Heat is transferred simultaneously by condition, convection and radiation
- inside boiler furnaces
- during melting of ice
- through the surface of the insulted pipe caring steam
- from refrigerator coils to freezer of a refrigerator
Q25 | The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as
- ablation
- radiation
- viscous dissipation
- irradiation