A galvanometer coil having a resistance of 20 ? and a full-scale deflection at 1.0 mA is connected in series with a 4980 ? resistance to build a voltmeter. What is the maximum voltage that this voltmeter can read?
A) 3.0 V
B) 1.0 V
C) 50 V
D) 5.0 V
E) 10 V
Answer: D
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A mercury-in-glass thermometer at 40°C (OD = 1 cm) is inserted through duct wall into a 3 m/s air stream at 66°C. This can be modelled as cylinder in cross-flow, as shown in figure. Estimate the heat transfer coefficient between the air and the thermometer.
GIVEN
• Thermometer in an air stream
• Thermometer temperature (Ts) = 40°C
• Thermometer outside diameter (D) = 1 cm = 0.01 m
• Air velocity (V) = 3 m/s
• Air temperature (Tb) = 66°C
FIND
• The heat transfer coefficient ch
ASSUMPTIONS
• Steady state
• Turbulence in the free stream approaching the thermometer is low
• Effect of the duct walls in negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the bulk temperature of 66°C
Thermal conductivity (k) = 0.0282 W/(m K) Kinematic viscosity (?) = 20*10-6 m2/s Prandtl number (Pr) = 0.71 At the thermometer surface temperature of 40°C, the Prandtl number (Prs) = 0.71
A current may be induced in a coil by
A. moving one end of a bar magnet through the coil. B. moving the coil toward one end of the bar magnet. C. holding the coil near a second coil while the electric current in the second coil is increasing. D. all of the above. E. none of the above.
During the hydrogen shell burning phase:
A) the star grows more luminous. B) the star becomes less luminous. C) helium is burning in the core. D) the core is expanding. E) hydrogen is burning in the central core.
A 3,000 kg truck experiences a net force of 2,000 N. What is its acceleration?