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MCQs

Total Questions : 448 | Page 39 of 45 pages
Question 381. . The ratio of the energy absorbed by the body to total energy falling on it is called
  1.    Absorptive power
  2.    Emissive power
  3.    Absorptivity
  4.    Emissivity
 Discuss Question
Answer: Option A. -> Absorptive power
Question 382. . Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of
  1.    1 : 1
  2.    2 : 1
  3.    1 : 2
  4.    4 : 1
 Discuss Question
Answer: Option C. -> 1 : 2
Question 383. . Total heat is the heat required to
  1.    Change vapor into liquid
  2.    Change liquid into vapour
  3.    Increase the temperature of a liquid or vapor
  4.    Convert water into steam and superheat it
 Discuss Question
Answer: Option D. -> Convert water into steam and superheat it
Question 384. . Moisture would find its way into insulation by vapor pressure unless it is prevented by
  1.    High thickness of insulation
  2.    High vapour pressure
  3.    Less thermal conductivity insulator
  4.    A vapor seal
 Discuss Question
Answer: Option D. -> A vapor seal
Question 385. . Absorptivity of a body will be equal to its emissivity
  1.    At all temperatures
  2.    At one particular temperature
  3.    When system is under thermal equilibrium
  4.    At critical temperature
 Discuss Question
Answer: Option C. -> When system is under thermal equilibrium
Question 386. . The amount of radiation mainly depends on
  1.    Nature of body
  2.    Temperature of body
  3.    Type of surface of body
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 387. . LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
  1.    Higher
  2.    Lower
  3.    Same
  4.    Depends on the area of heat exchanger
 Discuss Question
Answer: Option A. -> Higher
Question 388. . The rate of energy emission from unit surface. area through unit solid angle, along a normal to the surface, is known as
  1.    Emissivity
  2.    Transmissivity
  3.    Reflectivity
  4.    Intensity of radiation
 Discuss Question
Answer: Option D. -> Intensity of radiation
Question 389. . The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
  1.    Krichoff's law
  2.    Stefan's law
  3.    Wien' law
  4.    Planck's law
 Discuss Question
Answer: Option A. -> Krichoff's law
Question 390. . Cork is a good insulator because it has
  1.    Free electrons
  2.    Atoms colliding frequency
  3.    Low density
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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