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MCQs

Total Questions : 75 | Page 6 of 8 pages
Question 51. For an infinitely long fin, the efficiency of fin is given by
  1.    1/ml
  2.    2/ml
  3.    3/ml
  4.    4/ml
 Discuss Question
Answer: Option A. -> 1/ml
Answer: (a).1/ml
Question 52. For a fin of finite length with an insulated end, the fin efficiency is given as
  1.    tan h (ml)
  2.    tan (ml)/ml
  3.    tan h (m)/ml
  4.    tan h (ml)/ml
 Discuss Question
Answer: Option D. -> tan h (ml)/ml
Answer: (d).tan h (ml)/ml
Question 53. For a straight rectangular fin of thickness δ and width b, choose the correct option
  1.    P/A C = 1/ δ
  2.    P/A C = 2/ δ
  3.    P/A C = 3/ δ
  4.    P/A C = 4/ δ
 Discuss Question
Answer: Option B. -> P/A C = 2/ δ
Answer: (b).P/A C = 2/ δ
Question 54. For an infinitely long fin, the effectiveness of fin is given as
  1.    (P k/h AC)
  2.    (P k/h AC)^3/2
  3.    (P k/h AC)^1/2
  4.    (P k/h AC)^2
 Discuss Question
Answer: Option C. -> (P k/h AC)^1/2
Answer: (c).(P k/h AC)^1/2
Question 55. “Effectiveness of fin is the ratio of the fin heat dissipation with fin to that of no fin”. Choose the correct answer
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 56. A very long copper rod 20 mm in diameter extends horizontally from a plane heated wall maintained at 100 degree Celsius. The surface of the rod is exposed to an air environment at 20 degree Celsius with convective heat transfer coefficient of 8.5 W/m² degree. Workout the heat loss if the thermal conductivity of copper is 400 W/m degree
  1.    10.71 W
  2.    20.71 W
  3.    30.71 W
  4.    40.71 W
 Discuss Question
Answer: Option B. -> 20.71 W
Answer: (b).20.71 W
Question 57. The extended surface used for the enhancement of heat dissipation is
  1.    Convective coefficient
  2.    Fourier number
  3.    Fin
  4.    No finned surface
 Discuss Question
Answer: Option C. -> Fin
Answer: (c).Fin
Question 58. A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m² degree and t a = 30 degree Celsius. Calculate the fin efficiency
  1.    56.57%
  2.    66.57%
  3.    76.57%
  4.    86.57%
 Discuss Question
Answer: Option B. -> 66.57%
Answer: (b).66.57%
Question 59. Common applications of finned surfaces are with
(i) Electrical motors
(ii) Economizers for steam power plant
(iii) Convectors for steam and cold water heating systems
(iv) Cooling coils
Identify the correct option
  1.    1, 2 and 4
  2.    1, 2 and 3
  3.    1, 2, 3 and 4
  4.    1 and 2
 Discuss Question
Answer: Option A. -> 1, 2 and 4
Answer: (a).1, 2 and 4
Question 60. It is said that fins can take a variety of forms
(i) Longitudinal fins of rectangular cross section attached to a wall
(ii) Cylindrical tubes with radial fins
(iii) Conical rod protruding from a wall
Identify the correct statement
  1.    1 only
  2.    1 and 2
  3.    2 and 3
  4.    1, 2 and 3
 Discuss Question
Answer: Option D. -> 1, 2 and 3
Answer: (d).1, 2 and 3

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