Because of the need for increased toughness, shackles for most overhead lifting are made from _____
a. cast steel
b. forged steel
c. drop iron
d. tempered aluminum
b
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Steam turbine engines were an important development in the late 1800s because ____
a. they operated with a low pressure system that was safer than what was used before b. their spinning action was almost soundless c. they allowed boats to travel at speeds over 100 knots d. they became the main source of electricity production in the U.S.
A half-wave, single-phase ac-to-dc converter is loaded by an impedance of l0 mH inductance in series with l0 ? resistance. The ac voltage is 110 v (rms). For ? equal to 30o and 90o , calculate the following:
? = ° 10 , assuming that a freewheeling diode is used. a. Conduction period b. Average current of the load c. Average voltage of the load d. Power
Where in the compression refrigeration cycle is the refrigerant subcooled?
What will be an ideal response?
What is the bandwidth of a resonant circuit if its resonant frequency is 14.2 MHz, the inductive reactance is 3.5 k? and the coil's resistance is 8 ohm?
A) 32.5 kHz B) 28.4 kHz C) 2285 Hz D) 14.2 MHz