The critical temperature is the temperature below which a gas does not obey gas

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Question
The critical temperature is the temperature
Options
A. below which a gas does not obey gas laws
B. above which a gas may explode
C. below which a gas is always liquified
D. above which a gas will never liquified

Correct Answer

above which a gas will never liquified

Heat Transfer, Refrigeration and Air Conditioning problems

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3. If the energy radiated per second per sq. cm. of the surface for wave lengths lying between ?, and ? + d? is represented by (e?.d?), then e? is called
Options
A. absorptive power
B. emissive power
C. emissivity
D. none of these

5. A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
Options
A. k₁ k₂
B. k₁ + k₂
C.
D.

6. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Options
A. it considerably reduces mass of the system
B. it improves the C.O.P., as the condenser is small
C. the positive work in isentropic expansion of liquid is very small
D. it leads to significant cost reduction

9. The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
Options
A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
D. none of these

10. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
Options
A. automatic expansion valve
B. high side float valve
C. thermostatic expansion valve
D. low side float valve

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