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Tech note[1]


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  • 1. Dr. Kajli SharmaHumanities TECHNICAL WRITING Note—To emphasize points or remind readers of something, or to indicate minor problems in the outcome of what they are doing. Warning —To warn readers about the possibility of minor injury to themselves or others. Caution —To warn readers about possible damage to equipment or data or about potential problems in the outcome of what they are doing. Danger—To warn readers about the possibility of serious or fatal injury to themselves or others. 1. Place special notices at the point in text where they are needed. For example, place a caution or danger notice before discussing a step in which readers might hurt themselves. 2. Avoid having too many special notices at any one point in the text. Otherwise, the effectiveness of their special format will be lost. (If you have too many, combine them.) 3. With warnings, cautions, and danger notices, explain the consequences of not paying attention to the notice. State what will happen if the reader does not heed the notice. 4. The following examples use bold. If you have no access to bold, use underlines instead (but dont use both together). Avoid all-caps for the text of any special notice.Note Use the following format for simple notes: 1. Type the word "Note" followed by a colon. (Underline the word, or use bold if you have it.) 2. Begin typing the text of the note one space after the colon. (But dont put the text of the note in bold.) 3. Single space within the text of the note; skip one line above and below the note. 4. Start run-over lines on the regular left margin. 5. Align the note with the text to which it refers (as illustrated in the second example). Material Compiled For F.E. Div A & B Students
  • 2. Dr. Kajli SharmaHumanitiesWarning Use the following format for warnings: 1. Type the word "Warning," follow with a colon, italicize. 2. Tab to begin the text of the warning. (Try for 0.25 to 0.5 inches of space between the end of the warning label and the beginning of the text.) 3. Use regular body font for the text of the warning notice (no bold, no italics, no all-caps, no color). 4. Align the warning notice with the text it refers to. 5. Single space the text of the notice ; skip one line above and below the caution notice.Caution Use the following format for caution notices: 1. Type the word "Caution" follow it with a colon, and bold both the label and the colon. 2. Skip one line and begin the text of the caution aligned with the start of the caution label. 3. Single space the text of the caution; skip one line above and below the notice. Material Compiled For F.E. Div A & B Students
  • 3. Dr. Kajli SharmaHumanities 4. Align the caution notice with the text it refers to (in the preceding, the warning notice occurs within a numbered list and is indented accordingly).Danger Use the following format for danger notices: 1. Type the word "DANGER" in all-caps. (Underline it, or use bold.) 2. Align the danger notice with the text it refers to. 3. Single space the text of the danger notice; skip one line above and below the danger notice. 4. Use bold on the text of the danger notice if you have it (but never all-caps). 5. If you have graphics capability, draw a box around the danger notice (including the label). Material Compiled For F.E. Div A & B Students
  • 4. Dr. Kajli SharmaHumanitiesStandard Automobile AlternatorA key component of an automobiles charging system, which provides current to recharge thebattery and develops electricity to power all other electrical components when the engine isrunning, is the alternator. The other component of the charging system is the voltage regulator.The basic function of the alternator is to generate the electricity required to start and run theautomobile, while the regulator is designed to control the amount of voltage that circulatesthrough the system. This discussion will focus entirely upon the alternator, specifically, theprinciple of operation by which it works and its main components. An alternator (Fig. 1) consistsof rotor assembly, a stator assembly, and a rectifier mounted in a housing.Alternator Housing. The housing is usually made up of two pieces of die-cast aluminum.Aluminum is used because it is a nonmagnetic, lightweight material that provides good heatdissipation. Bearings supporting the rotor assembly are mounted in the front and rear housing.The front bearing is usually pressed into the front housing or onto the rotor shaft. It is usually afactory-lubricated ball bearing. The rear bearing is usually installed with a light press fit in therear housing.Stator Assembly. The stator is clamped between the front and the rear housing. A number ofsteel stampings are riveted together to form its frame. Three windings around the stator frame arearranged in layers in each of the slots on the frame. At the other end, they are connected into therectification assembly.Rotor Assembly. The rotor assembly consists of a rotor shaft, a winding around an iron core, twopole pieces, and slip rings. The rotor is pressed into the core. Six-fingered, malleable, iron polepieces are pressed onto the shaft against each end of the winding core. They are placed so that the Material Compiled For F.E. Div A & B Students
  • 5. Dr. Kajli SharmaHumanitiesfingers mesh but do not touch. When direct current is passed through the field coil winding, thefingers become alternately north and south poles. A slip ring assembly is pressed on to the rearend of the rotor shaft and connected to the two ends of the field winding.Two brushes are held against the slip rings by springs, usually mounted in plastic brush holdersthat support the brushes and prevent brush sticking. Each brush is connected into the circuit by aflexible copper lead wire. The brushes ride on the slip rings and are connected through a switch tothe battery. When the switch is closed, current from the battery passes through one brush, throughthe slip ring, and then through the field winding. After leaving the field winding, current flowsthrough the other slip ring and brush before returning to the battery through the ground returnpath. The flow of electrical energy through the field winding, called field current, creates themagnetic field for the rotor.Rectifier Assembly. The rectifier assembly consists of six diodes mounted either in the rearhousing or in a separate small housing called a rectifier bridge. Three of the diodes are connectedto ground, and three are mounted in an insulator. Since the mounting assembly carries off heatcaused by the operation of the diode, it is often called a heat sink.A fan and pulley assembly is either pressed onto the rotor shaft or held with a nut. The pulleydrives the rotor through an engine accessory drive belt. The fan behind the alternator pulley pullsair in through vents at the rear of the alternator to cool the diodes. Material Compiled For F.E. Div A & B Students