MCQs
Total Questions : 70
| Page 6 of 7 pages
Answer: Option D. -> Linear
Answer: (d).Linear
Answer: (d).Linear
Answer: Option A. -> Q = kA (t₁-t₂)/δ
Answer: (a).Q = kA (t₁-t₂)/δ
Answer: (a).Q = kA (t₁-t₂)/δ
Question 53. The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow
Answer: Option B. -> 1.667 degree/W
Answer: (b).1.667 degree/W
Answer: (b).1.667 degree/W
Question 54. A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m². If the other face of the slab is at a constant temperature t₂ = 38 degree Celsius. Comment on the temperature with respect to the slab?
Answer: Option C. -> 47.08 degree Celsius
Answer: (c).47.08 degree Celsius
Answer: (c).47.08 degree Celsius
Answer: Option B. -> 1/2
Answer: (b).1/2
Answer: (b).1/2
Answer: Option A. -> 3:2:1
Answer: (a).3:2:1
Answer: (a).3:2:1
Answer: Option A. -> 1/A (1/h₁ + δ/k + 1/h₂)
Answer: (a).1/A (1/h₁ + δ/k + 1/h₂)
Answer: (a).1/A (1/h₁ + δ/k + 1/h₂)
Question 58. A composite wall is made of two layers of thickness δ₁ and δ₂ having thermal conductivities k and 2k and equal surface area normal to the direction of heat flow. The outer surface of composite wall are at 100 degree Celsius and 200 degree Celsius. The minimum surface temperature at the junction is 150 degree Celsius. What will be the ratio of wall thickness?
Answer: Option C. -> 1:2
Answer: (c).1:2
Answer: (c).1:2
Answer: Option B. -> More than average of the temperature at the wall faces
Answer: (b).More than average of the temperature at the wall faces
Answer: (b).More than average of the temperature at the wall faces
Answer: Option C. -> Radiation
Answer: (c).Radiation
Answer: (c).Radiation