For metals and ceramics to be superplastic, they must have a high ___________hardening rate.
Fill in the blank(s) with the appropriate word(s).
strain
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Thermodynamic Processes: The process shown on the pV diagram in the figure is
A. adiabatic. B. isothermal. C. isochoric. D. isobaric.
A resistance of 55 ?, a capacitor of capacitive reactance 30 ?, and an inductor of inductive reactance 30 ? are connected in series to a 110-V rms, 60-Hz power source. What rms current flows in this circuit?
A) 2.0 A B) less than 2.0 A C) more than 2.0 A D) none of the given answers
In a shell-and-tube heat exchanger with h i= h o= 5600 W/(m2 K) and negligible wall resistance, by what per cent would the overall heat transfer coefficient (based on the outside area) change if the number of tubes was doubled? The tubes have an outside diameter of 2.5 cm and a tube wall thickness of 2 mm. Assume that the flow rates of the fluids are constant, the effect of temperature on fluid properties is negligible, and the total cross sectional area of the tubes is small compared to the flow area of the shell.
GIVEN
• Shell and tube heat exchanger
• Heat transfer coefficients: h i= h o= 5600 W/(m2 K)
• Negligible wall resistance
• Tube outside diameter (Do) = 2.5 cm = 0.025 m
• Tube wall thickness (t) = 2 mm = 0.002 m
FIND
• The per cent change in the overall heat transfer coefficient if the number of tubes is doubled
ASSUMPTIONS
• Flow rates of the fluids are constant
• The effect of temperature of fluid properties is negligible
• The fluid flow is turbulent in the tubes (this is consistent with the high heat transfer coefficients)
SKETCH
If the diameter of a wire increases, its resistance __________
Fill in the blank(s) with correct word