An npn transistor with a ? of 250 has its base current (IB) go from 25 ?A to 75 ?A. By how much does the collector current increase?
A) 6.25 mA B) 18.75 mA C) 12.5 mA D) 18.75 ?A
C
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In grafting, the tissues composing the "bark" are: ________, ________, ________, and ________, while the "wood" is generally composed of ________ and ________.
Fill in the blank(s) with the appropriate word(s).
When the truss in Figure P8.8 is loaded, the support at E displaces 0.6 in. vertically downward and the support at A moves 0.4 in. to the right. Compute the horizontal and vertical components of displacement of joint C. For all bars the area = 2 in. 2 , and E = 29,000 kips/in. 2
What input sensor is found in the fan section?
A) Low temperature thermostat B) Filter status toggle switch C) Mixed-air temperature sensor D) Supply-air temperature sensor
Two technicians are discussing how to loosen bleeder valves. Technician A says that a shock is usually necessary to break the taper at the base of the valve. Technician B says to apply steady, loosening torque to the bleeder valve using a 6-point wrench. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician