In case ofsensible cooling of air, the coil efficiency is given by B.P.F. - 1 1

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Question
In case ofsensible cooling of air, the coil efficiency is given by
Options
A. B.P.F. - 1
B. 1 - B.P.F.
C.
D. 1 + B.P.F.

Correct Answer

1 - B.P.F.

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1. 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

3. 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.

7. 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

8. 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

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