A superconducting wire carries a current of 1.0 × 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire
2.0 × 10^?3 T
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Magnetic particle inspection can detect only _________cracks.
Fill in the blank(s) with the appropriate word(s).
A light oil flows through a copper tube of 2.6-cm-ID and 3.2-cm-OD. Air flows perpendicular over the exterior of the tube as shown in the following sketch. The convection heat transfer coefficient for the oil is 120 W/(m2 K) and for the air is 35 W/(m2 K). Calculate the overall heat transfer coefficient based on the outside area of the tube (a) considering the thermal resistance of the tube, (b) neglecting the resistance of the tube.
GIVEN
• Air flow over a copper tube with oil flow within the tube
• Tube diameters
? Inside (Di) = 2.6 cm = 0.026 m
? Outside (Do) = 3.2 cm = 0.032 m
• Convective heat transfer coefficients
? Oil h i= 120 W/(m2 K)
? Air h o= 35 W/(m2 K)
FIND
• The overall heat transfer coefficient based on the outside tube area (Uo), (a) considering the thermal resistance of the tube, and (b) neglecting the tube resistance
ASSUMPTIONS
• Uniform heat transfer coefficients
• Variation of thermal properties is negligible
SKETCH
PROPERTIES AND CONSTANTS
the thermal conductivity of copper (k) = 392 W/(m K) (at 127°C)
Three capacitors have capacitances C1 < C2 < C3 . If these capacitors are connected in series, which of the following is true for the resulting equivalent capacitance?
a. Ceq < C1 b. Ceq > C3 c. Ceq = (C1 + C2 + C3)/3 d. None of the above is always correct.
Glycerin, with a viscosity of 1.50 Ns/ m2, is flowing with an average speed of 1.20 m/s through a tube that has a radius of 5.00 mm and is 25.0 cm long. What is the drop in pressure?
A) 144 kPa B) 45.8 kPa C) 72.0 kPa D) 76.3 kPa E) 129 kPa