GATE 2022 ME: Heat-Transfer Quiz - 3

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Question 1

The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 μm. If the peak wavelength of emitted radiation changes to 2.90 μm, then the temperature (in K) of the black body is___.

• A500
• B1000
• C4000
• D8000

Question 2

For a glass plate transmissivity and reflectivity are specified as 0.76 and 0.08 respectively, the absorptivity of the glass plate is ___________.

• A0.86
• B0.08
• C0.16
• D1.00

Question 3

The emissive power of a blackbody is P. If its absolute temperature is doubled, the emissive power becomes.

• A2P
• B4P
• C8P
• D16P

Question 4

Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If D₁ and D₂ are the diameters of the inner and outer tubes respectively, then the view factor F₂₂ is given by

• A
• BZero
• C
• D
  

Question 5

Calculate the total emissive power of a black body whose temperature is 573 ºC and Area is 5m²____.

• A2.296 kW
• B459.27kW
• C145.2 kW
• D2.296 kW

Question 6

 Find the radiation heat exchange between two large parallel steel plates of emissivities 0.7 and 0.5 held at temperatures of 1000 K and 500 K respectively, if a thin copper plate of emissivity 0.1 is introduced as a radiation shield between the two plates is?

• A2480.625 W/m²
• B2680.625 W/m²
• C3000.25 W/m²
• D3250.25 W/m²

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