Session 2: Electrical Test Equipments
Module 5: Auto Electrical System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. One of the simplest types of test equipment is the …………..wire.
Ans: jumper
2. A test light is limited in that it does not display the ………. at thepoint of the circuit being tested.
Ans: voltage value
3. Digital multimeters (DMMs) are preferred for testing computercircuits due to their high input resistance, which reduces the risk of…………… to components.
Ans: damage
4. An oscilloscope displays voltage traces on a screen, representingvoltage variations over……………
Ans: time
Multiple Choice Questions
1. What is the primary purpose of using jumper wires in electrical testing?
A) To measure resistance
B) To diagnose voltage drops
C) To provide a ground for testing
D) To bypass load components
Ans: D) To bypass load components
2. Which tool is used to “look” for electrical power in a circuit?
A) Voltmeter
B) Ammeter
C) Logic probe
D) Ohmmeter
Ans: C) Logic probe
3. Which type of multimeter is recommended for testing computer-controlled circuits due to its high input resistance?
A) Analog multimeter
B) Digital multimeter (DMM)
C) Ohmmeter
D) Logic probe
Ans: B) Digital multimeter (DMM)
4. What is the purpose of a logic probe in electrical testing?A) Measure voltage drops
B) Test diodes
C) Measure frequency
D) Test computer-controlled circuits
Ans: D) Test computer-controlled circuits
5. In a circuit, the sum of voltage drops around the circuit is equal to:
A) Zero
B) The source voltage
C) Infinity
D) Half of the source voltage
Ans: B) The source voltage
Answer the following questions
1. Discuss the importance of electrical test equipment in the testingof automobile electrical circuits.
Ans: Electrical test equipment is very important for testing automobileelectrical circuits because modern vehicles use complex electrical andelectronic systems. These tools help technicians to identify faults accuratelyand quickly. Test equipment such as multimeters, test lights, and oscilloscopesallow checking voltage, current, resistance, and signal patterns. Proper testinghelps avoid unnecessary replacement of components, reduces repair time, ensures safety, and improves vehicle reliability and performance.
2. Name various electrical test equipment used in an automobile.
Ans: Various electrical test equipment used in automobiles include:
Test light
Jumper wire
Digital multimeter
Analog multimeter
Logic probe
Oscilloscope
Battery tester
Scan tool
3. With the help of multi-meter what parameters can be tested?Ans: With the help of a multimeter, the following parameters can be tested:
Voltage
Current
Resistance
Continuity
Diode condition
4. Explain how to test following parameters with the help of multimeters?
a. Voltage
Ans: To test voltage, the multimeter is set to the voltage range. The probesare connected in parallel across the component or circuit. The meter thendisplays the voltage present in the circuit.
b. Current
Ans: To test current, the multimeter is set to the current range and connectedin series with the circuit. This allows the current flowing through the circuit to pass through the meter for measurement.
c. Resistance
Ans: To test resistance, the multimeter is set to the resistance range. Thepower supply must be switched off. The probes are connected across thecomponent, and the meter displays the resistance value.
5. Explain regarding the Oscilloscope. What parameters can bechecked with the help of an oscilloscope?
Ans: An oscilloscope is an electronic test instrument used to observe andanalyze electrical signals. It displays voltage changes over time in the form ofwaveforms on a screen. With the help of an oscilloscope, parameters such asvoltage amplitude, frequency, signal shape, time interval, and waveformpatterns can be checked. It is especially useful for testing sensors andcomputer-controlled circuits in modern vehicles.
Activity
1. Make a list of the auto electrical testing equipment and also statetheir application
Ans:
1. Name of the electronic testing equipment: Test light Applications: Used to check the presence of voltage in a circuit
2. Name of the electronic testing equipment: Jumper wire Applications: Used to bypass components and complete circuitstemporarily
3. Name of the electronic testing equipment: Digital multimeter Applications: Used to measure voltage, current, resistance, and continuity
4. Name of the electronic testing equipment: Logic probe Applications: Used to test digital signals in electronic circuits
5. Name of the electronic testing equipment: Oscilloscope Applications: Used to analyze signal waveforms and sensor outputs
6. Prepare a poster showing electrical test equipment used in testingof automobile electrical components and circuits.
Ans: The poster should include pictures and names of test light, jumperwire, digital multimeter, logic probe, oscilloscope, and battery tester, alongwith their basic uses in testing automobile electrical components and circuits.
