cameroon gce intermediate level 2025 electrical and electronic circuits 1
cameroon gce intermediate level 2025 electrical and electronic circuits 1
- Which of the following statements is true for Diodes?
A They convert dc to ac
B They conduct current on both halves of an ac wave
C They conduct current only on one half of an ac wave
D They furnish ac voltages to different parts of an electronic circuit
- Half wave rectifiers
A converts dc to ac
B take place when the diode is reverse biased
C has an output frequency half that of the input
D has a peak voltage across the load which is approximately 1.44xemax of the transformer secondary.
Figure 1
In the circuit of figure 1, the reading of the ohmmeter is:
A 5$\Omega$
B 6.67$\Omega$
C 10$\Omega$
D 30$\Omega$
Original circuit – Equivalent circuit
Figure 2
Figure 2 shows an original circuit having a load resistance RL and its equivalent. Which theorem or law does it explain?
A Superposition theorem
B Kirchhoff’s law
C Norton’s theorem
D Thevenin’s Theorem
| ab | 00 | 01 | 11 | 10 |
| c | 0 | 0 | 1 | 0 |
| c | 1 | 0 | 0 | 0 |
| Figure 3 | ||||
| The Karnaugh map of figure 3 shows a function with inputs a, b and c and output S. The simplified expression of S is: | ||||
| A | ||||
| B | ||||
| C | ||||
| D $S = b + a\bar{b}\bar{c} + $ |
- An a.c source has a voltage V=20sin300πt the frequency of the supply:
A 50Hz
B 50Hz
C 47.7Hz
D 300Hz
- Rectification is the conversion of
A ac to dc
B dc to ac
C dc to ac
D dc to dc
- The formula dL/dt is to determine the
A resistance of a linear resistor
B resistance of a non-linear resistor
C resistance of a conductor
D resistance of a conductor at variable length
10 ohms – 3 ohms – 4 ohms
100, 50Hz
U
Figure 4
For the circuit of figure 4, if U=100V, 50Hz, the value of the current I at resonance is:
A I=10A
B I=33.3A
C I=25A
D I=10.1A
