ELEC1111 Electrical Engineering and Telecommunications Online Laboratory Exam – Questions (40 minutes with 5 minutes reading time) Name: ___________________ Student ID: ______________ Lab Time: ______________ Question 1 (4 marks) Questions 1 and 3 of the Sample Lab Exam use the remote lab practical setup in Figure 1. Figure 1 IMPORTANT: Keep relay switches S1, S2 and S6 open for Question 1. Set the signal generator to give a sine wave with a frequency of 1 kHz. Display this signal on the oscilloscope in channel 1 (V1). Select the oscilloscope time base to see 5 complete periods of the signal on the screen. Select a suitable vertical scale for the oscilloscope and adjust the signal magnitude of the generator to give 4 volts peak-to-peak. FOR MARKERS ONLY: TOTAL Initials Initials 1st Initials 2nd Final Mark Question 2 (4 marks) Question 2 of the Sample Lab Exam uses the remote lab practical setup in Figure 2. Figure 2 IMPORTANT: Keep relay switches S1 and S6 open for all of Question 2. Close relay switch S2 for this question. Using the remote lab practical setup in Figure 2, configure the circuit shown in Figure 3 and measure the voltage V3 and the current I2 with the digital multi-meter. Write the recorded voltage/current values and the required relay status (open or closed) for each relay in Table 1. Figure 3 Measure V3 Measure I2 Relay switch
S3 Open/Closed Open/Closed Relay switch S4 Open/Closed Open/Closed Relay switch S5 Open/Closed Open/Closed Measurement Value Table 1 FOR MARKERS ONLY: Question 3 (6 marks) Question 3 of the Sample Lab Exam uses the remote lab practical setup in Figure 1. Using the remote lab practical setup in Figure 1, configure the circuit shown in Figure 3, but replace the 5 V dc power supply with the signal from the signal generator (as specified in Question 1). Display the voltage across the resistor R1 on the oscilloscope. Remember that the ground of both voltage probes must be connected to the circuit ground. Take a screenshot of this waveform and paste this in the box below. Initials Initials 1st Initials 2nd Final Mark Question 4 (6 marks) Question 4 of the Sample Lab Exam uses the remote lab practical setup in Figure 4. Figure 4 IMPORTANT: Keep relay switches S1 and S2 open for Question 4. Close relay switch S6 for this question. Figure 5 Set the signal generator to output a square wave of amplitude 4 V peak to peak and of frequency 1 kHz. Use the oscilloscope to display the signal generator waveform and the voltage across the capacitor with the falling edge of the signal generator waveform centred on the screen with one full cycle of both waveforms displayed. FOR MARKERS ONLY: Initials Initials 1st Initials 2nd Final Mark S6