Electrical Circuits and Inductors Quiz

Auto Electrical

• A cell converts mechanical energy to electrical energy.
• A battery gives DC voltage.
• Electrolyte is a mixture of H2SO4 and H2O.
• The positive terminal of a lead acid cell is PbO2.
• A dry cell is a primary cell.
• A lead acid cell is a secondary cell.

Primary and Secondary Cells

• A primary acid cell is a non-rechargeable cell.
• A secondary acid cell is a rechargeable cell.

Battery Characteristics

• The unit of battery capacity is ampere-hour.
• Distilled water should be used in a battery.
• When removing connections from a battery, the negative terminal should be removed first, followed by the positive terminal.
• A fully discharged battery's plates do not cover with lead sulfate (PbSO4).
• The ampere-hour capacity of a battery is not directly proportional to the number of plates and size of plates.
• A battery's life can be shortened by long idle periods in a discharged condition.
• When a cell's specific gravity is down to about 1.150, the cell is completely discharged.

Alternator

• An alternator converts mechanical energy to electrical energy.
• An alternator initially generates AC voltage.

Inductor

• An iron core inductor has a coil wound on a ferromagnetic core.
• Inductive reactance (XL) is calculated by XL = 2πfL.
• A transformer transfers AC power from one circuit to another circuit.
• When a coil is short-circuited, an ohm meter reads zero resistance.
• A choke with 10H inductance at 100HZ AC has a reactance of 628 Ω.

Inductor Properties

• The voltage across an ideal coil leads the current through it by 90°.
• Inductor is used in filter circuits and relays.
• Alternator works on self-induction.
• Inductance of a coil is directly proportional to the number of turns of the coil.
• Inductance of a coil is not inversely proportional to the length of the coil.
• Inductance is the property of an inductor that opposes the change of current flowing through it.

CSM Engine Circuit

• A lube oil pressure switch in a CSM engine circuit is of the NO type.
• A bypass switch in a new Duomatic engine circuit is of the NO type.
• In a CSM machine, the engine will stop if the temperature is at 950°C or above.
• The function of a time delay circuit in a new Duomatic engine circuit is to separate the programmer battery and working light during starting.
• The mechanical recorder is directly connected to the battery in a CSM engine circuit.
• There are 7 stopper switches provided in a CSM engine circuit.
• Hold relay is used in a latch type engine circuit.

Gear Box

• Gear box is controlled by a hydraulic system.
• There are 4 solenoids for clutch operation in a Z.F. gear box.
• The M3 solenoid is common for forward direction in all gears.
• If the brake pressure is 3 or more, the Z.F. gear box will neutral.
• The M2 and M4 solenoids are energized when the 2nd gear is selected in the reverse direction.
• The 5b26 and 11b26 switches in a Z.F. circuit are limit switches.
• In a working position, the green LED will glow on the B19 panel in a CSM machine.

Solenoids

• The function of a lock-up solenoid is to operate the converter clutch.
• The RPM sensing transducer is fitted on the turbine in a Z.F. gear box.
• Solenoids are fitted in the shifter assembly of a Z.F. gear box.
• The Z.F. pressure fault indicator shows a red indication at less than 12.