1) Two identical lamps are connected in parallel to a 12-volt source. The voltage across each lamp is a) 12V b) 6V c) 4V d) 2V 2) A break or interruption in an electrical circuit is a) A ground b) None of these c) Open d) Short 3) An ammeter is connected in series with a 12 volt lamp and shows a current flow of 2amp. What is the power rating of the lamp? a) 24 Ohm b) 24 Watt c) 6 Watt d) 6 Ohm 4) Two 12 volt batteries connected in series would have an output of? a) 24V b) 12V c) 36V d) 48V 5) A relay is normally fitted to a vehicle's headlamp circuit to: a) reduce the current flow through the lighting switch b) control the operation of the dip and main beam headlamps c) reduce the resistance of the headlamp lighting circuit d) increase the current flow through the lighting switch 6) The stator of the alternator is found a) In the rotor b) In the voltage regulator c) In the rectifier d) In the casing 7) Voltage is....... a) Pressure b) Amps c) Power d) Current 8) The light from a front fog light is dim. Which of the following is NOT a possible cause of the fault? a) Corroded light reflector b) Open circuit supply cable c) Corroded earth connection d) Corroded supply cable 9) A car's battery has gone flat. To start the engine you should: a) connect a spare battery to the car's alternator b) connect a spare battery in parallel to the car's battery c) connect a spare battery in series to the car's battery d) connect a spare battery to the car's starter motor 10) A lamp with a poor earth connection will cause a) the bulb to blow b) the circuit fuse to blow c) the lamp to be brighter d) the lamp to be dim 11) Battery electrolyte is a mixture of water and a) Lead sulfate b) Sulfuric acid. c) Lead peroxide d) All of the above 12) The unit of electrical power is the a) Watt b) Amps c) Voltage d) Coulomb 13) If a fuse blows again after it has been replaced, what is the most likely cause: a) Resistance b) Short circuit c) None of these d) Open circuit 14) A vehicle has been started and idling. The voltage at the battery is 12v. What is the most likely problem a) Defective voltage regulator b) Defective commutator c) Defective battery d) Defective Armature 15) With the engine cranking, a 4-volt drop is measured across the starter insulated (B+) battery cable. What should be done? a) Nothing, this voltage drop is acceptable b) Charge the battery. c) Install a larger battery. d) Replace the cable or clean and tighten the connection. 16) What is this? a) Armature b) Brushes c) Pinion d) Solenoid 17) Current flow in a circuit is measured using a) A volt meter b) A dwell meter c) An Ammeter d) An Ohm meter 18) An LED is a type of a) diode that emits light b) transistor that emits light c) diode used in rectifiers d) electronic sensor 19) The diagram shows three resistors. If the resistor R1 is 2 ohm, R2 is 2 ohm and R3 is 2 ohm, what is the reading on the ammeter (A) when the switch is closed? a) 3amps b) 2amps c) 9amps d) 4amps 20) The alternator brushes is connected to: a) Regulator b) Rectifier c) Slip rings d) Commutator 21) In a vehicle alternator the rectifier pack a) converts AC to DC b) has a zener diode c) regulates the voltage d) converts DC to AC 22) What is the meaning of a wire a rating of 28/.3 a) 3 lengths of 28mm wire b) 28 strands of wire at 0.3 diameter c) It can carry 28amp for 0.3 of an hour d) it has 28 strands and a total diameter of 0.30mm 23) The negative plate on a battery is a) Sponge lead b) Lead dioxide c) Copper d) Steel 24) What is the Symbol representing? a) Resistor b) Capacitor c) Connector d) Ground 25) To avoid damaging an ammeter you should only connect it a) in parallel with circuit components b) between positive and negative c) between negative and positive d) in series with circuit components 26) A device that produces a voltage when put under pressure is: a) DC Motor b) Battery c) Generator d) Crystal 27) A series circuit has a 0.5, 1 and 1.5 ohm resistor. What will the current flow be if the vehicle has a 12v battery. a) 2 b) 4 c) 3 d) 5 28) How many time should an indictor bulb flash per minute? a) 40-80 b) 120-140 c) 60-120 d) 10-50 29) What is the standard WATT rating of a vehicles brake light bulb? a) 21W b) 55W c) 15W d) 5W 30) What is this  a) Stator b) Regulator c) Rotor d) Rectifier

LV03 Electrical Systems Practice Test

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