Question 1
AIM: To determine the phase angle in an RL a.c. circuit
- Connect the circuit as shown in Fig.1.
- Ask the supervisor to check the circuit connection.
- You are provided with Table 1.
- Set the power supply unit to 12 V.
- Close switch (S).
- Read and record in Table 1 the values of VRC, VCE and VE.
- Open switch (S).
- Repeat steps (e) to (g) for the other values of supply voltages (VCC) in Table 1.
- Complete Table 1.
- Comment on your result and state the function of resistor (R1):
Observation
The expected responses were:
Comment on result
VT is approximately equal to VCC.
Function of resistor R1
- To bias the base of the transistor.
- To set the operating point/condition of the transistor.
Chief Examiner reported that candidates responded very well to question 1.