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Refrigeration & Air Conditioning Mcqs

Q:

What are the temperature and pressure for N.T.P. (Normal Temperature Pressure)?

A) 0 C, 1 bar B) 273 C, 15 bar
C) 288 K, 1 bar D) 273 K, 1 bar
 
Answer & Explanation Answer: A) 0 C, 1 bar

Explanation: Generally, 0 C is taken as the standard temperature, i.e. -273 K and pressure is 760 mm of hg or 1 bar.

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70
Q:

What are the temperature and pressure for S.T.P. (Standard Temperature Pressure)?

A) 0 C, 1 bar B) 273 C, 15 bar
C) 288 K, 1 bar D) 273 K, 1 bar
 
Answer & Explanation Answer: C) 288 K, 1 bar

Explanation: Generally, 15 C is taken as the standard temperature, i.e. 288 K and pressure is 760 mm of Hg or 1 bar.

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115
Q:

What is absolute zero temperature?

A) 0 C B) 273 C
C) -273 K D) -273 C
 
Answer & Explanation Answer: D) -273 C

Explanation: Temperature of -273 C i.e. 0 K is called absolute zero temperature, as it’s not possible to go beyond that temperature on the earth.

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91
Q:

1 Bar = ______ mm of Hg.

A) 100 B) 720
C) 760 D) 360
 
Answer & Explanation Answer: C) 760

Explanation: Sometimes pressure is represented in the form of height of mercury in the tube of 1 mm2 area, i.e. 760 mm practically for 1 bar pressure.

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133
Q:

1 Pascal = 1 _____

A) N/mm² B) N/m³
C) N/m² D) N/mm³
 
Answer & Explanation Answer: C) N/m²

Explanation: Pascal is the unit generally used to express pressure, which means the amount of pressure in Newton, divided by the area i.e. square meters.

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85
Q:

What is the value of 110 C on the Fahrenheit scale?

A) 198 F B) 383 F
C) – 73 F D) 230 F
 
Answer & Explanation Answer: D) 230 F

Explanation: Not available for this question

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135
Q:

What does 298 Kelvin mean on Celsius scale?

A) 27 C B) 25 C
C) 15 C D) 35 C
 
Answer & Explanation Answer: B) 25 C

Explanation: As for conversion of Kelvin to Celsius 273 is to be deducted, hence 298 K = 298 – 273 = 25C.

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143
Q:

At what K is the triple point of water?

A) 0 K B) 4 K
C) 273.16 K D) -273.16
 
Answer & Explanation Answer: C) 273.16 K

Explanation: At 273.16 K, i.e. 0C water contains all the three forms, solid, liquid as well as gas partially.

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