When the current atmospheric pressure is not considered in measuring pressure, it is known as:
A) Column pressure. B) Absolute pressure. C) Internal pressure. D) Gauge pressure.
B
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Technician A says to grind less than 0.020" from the tip of a valve stem to avoid grinding through the hardened area. Technician B says that the tip should be ground approximately the same amount as the face and seat in order to minimize valve guide wear by centering the rocker arm on the stem tip when the valve is half open. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B
Answer the following statement(s) true (T) or false (F)
1. The brush polarity in a separately excited generator cannot be changed by reversing the rotation of the armature or the direction of the field current. 2. If both the armature direction and the direction of the field current change, the brush polarity remains the same. 3. The magnitude of the voltage depends on the rate at which the flux is cut. 4. Field control of the output voltage is accomplished by varying the total resistance of the field circuit with a field rheostat. 5. Brush polarity changes when the field current is zero.
Technician A says that lifting the vehicle and turning the steering wheel may help bleed air out of some systems. Technician B says that if this procedure is used, the wheels should be turned from stop to stop. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
For the circuit shown in Figure P12.8, vAC is a sinusoid with a 12-V peak amplitude, R = 3 k?, and the forward-conducting voltage of D is 0.65 V.
a. Sketch the waveform of vo(t).
b. Find the average value of vo(t).
