The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to be
A) 50 A.
B) 100 A.
C) 200 A.
D) none of the given answers.
A
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A thermocouple (0.8-mm-OD) is located horizontally in a large enclosure whose walls are at 37°C. The enclosure is filled with a transparent quiescent gas that has the same properties as air. The electromotive force (emf) of the thermocouple indicates a temperature of 230°C. Estimate the true gas temperature if the emissivity of the thermocouple is 0.8.
GIVEN
• Horizontal thermocouple in a large enclosure
• Thermocouple outside diameter (D) = 0.8 mm = 0.0008 m
• Enclosure wall temperature (Te) = 37°C = 310 K
• Gas is enclosure is quiescent and has the same properties as air
• Thermocouple reading (Ttc) = 230°C = 503 K
• Thermocouple emissivity (?) = 0.8
FIND
• True gas temperature (T?)
ASSUMPTIONS
• Enclosure behaves as a black body
• Conduction along the thermocouple out of the enclosure is negligible
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann Constant (?) = 5.67 ?10–8 W/(m2 K4).
Force on a Wire: What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.
A. 0.022 N/m B. 0.045 N/m C. 0.17 N/m D. 0.26 N/m
A resistor, inductor, and capacitor are connected in series, each with an effective (rms) voltage of 63 V, 176 V, and 65 V, respectively. What is the magnitude of the phase angle in this circuit?
a. 30° b. 64° c. 59° d. 60° e. 69°
The pitch of a musical sound is most related to
A) wavelength. B) frequency. C) speed. D) amplitude. E) all of the above