Refrigeration And Air Conditioning - Study Mode

[#26] The leaks in a refrigeration system using Freon are detected by
Correct Answer

(A) Halide torch which on detection produces greenish flame lighting

Explanation

Solution: The leaks in a refrigeration system using Freon are detected by Halide torch which on detection produces greenish flame lighting

[#27] The higher temperature in vapour compression cycle occurs at
Correct Answer

(D) Compressor discharge

Explanation

Solution: The higher temperature in vapour compression cycle occurs at Compressor discharge

[#28] Highest temperature encountered in refrigeration cycle should be
Correct Answer

(D) Much below critical temperature

Explanation

Solution: Highest temperature encountered in refrigeration cycle should be Much below critical temperature

[#29] In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40°C and an evaporator temperature of 5°C, the heat rejection factor is about
Correct Answer

(B) 1.12

Explanation

Solution: T1 = 5°C or 273 + 5 = 278K T2 = 40°C or 273 + 40 = 313K $$eqalign{
& { ext{C}}{ ext{.O}}{ ext{.P}}{ ext{.}} = frac{{{ ext{T1}}}}{{{ ext{T2}} - { ext{T1}}}} cr
& = frac{{278}}{{313 - 278}} cr
& = frac{{278}}{{35}} cr
& { ext{C}}{ ext{.O}}{ ext{.P}}{ ext{.}} = 7.942 cr
& { ext{Heat rejection factor (HRF)}} cr
& = 1 + frac{1}{{{ ext{C}}{ ext{.O}}{ ext{.P}}{ ext{.}}}} cr
& = 1 + frac{1}{{7.942}} cr
& = frac{{8.942}}{{7.942}} cr
& = 1.12 cr} $$

[#30] The capillary tube is not used in large capacity refrigeration systems because
Correct Answer

(B) Capacity control is not possible

Explanation

Solution: The capillary tube is not used in large capacity refrigeration systems because Capacity control is not possible