- 1. The logic gate that will have “1” at its output when any one of its inputs is a 1 is called a(n):
A) AND gate
B) NOT gate
C) OR gate
D) NOR gate
- 2. How many truth table entries are required for a 3-input NAND gate?
A) 3
B) 27
C) 9
D) 6
- 3. How many flip flops are contained in a 7474 IC?
A) 3
B) 4
C) 2
D) 1
- 4. The basic logic gate whose output is the inverse or complement of its input is called a(n):
A) NOT gate
B) AND gate
C) NAND gate
D) XOR gate
- 5. A resistor with colour code "Red Red Orange Gold" has a value of:
A) 2200Ω
B) 22MΩ
C) 220kΩ
D) 22kΩ
- 6. A resistor with colour code " Yellow Red Red Gold" has a value of:
A) 4.2kΩ
B) 240kΩ
C) 430Ω
D) 420Ω
- 7. The 3 pins of a bipolar transistor are called the:
A) Plate, Electrode and Collector
B) Source, Drain and Gate
C) Collection, Bass, Gate
D) Collector, Emitter and Base
- 8. The total resistance of the following resistor combination is:
A) 1360Ω
B) 680Ω
C) 920Ω
D) 340Ω
- 9. The total resistance of the following resistor combination is:
A) 450Ω
B) 900Ω
C) 9000Ω
D) 225Ω
- 10. The voltage Vout of the voltage divider circuit is:
A) 9 volts
B) 6 volts
C) 4.5 volts
D) 3 volts
- 11. The total current flowing through this circuit is:
A) 1 A
B) 100mA
C) 0.01 A
D) 1mA
- 12. The total capacitance of the following capacitor combination is:
A) 100µF
B) 1000µF
C) 50µF
D) 200µF
- 13. The total capacitance of the following capacitor combination is:
A) 100µF
B) 1000µF
C) 50µF
D) 200µF
- 14. The total capacitance of the following capacitor combination is:
A) 250µF
B) 50µF
C) 150µF
D) 100µF
- 15. An Infra-Red transmitter usually transmits at a frequency of:
A) 38kHz
B) 28kHz
C) 40kHz
D) 5kHz
- 16. The following charging capacitor circuit has a Time Constant of:
A) 3 seconds
B) 10 seconds
C) 2 seconds
D) 5 seconds
- 17. The capacitor in the circuit is fully charged after:
A) 40 seconds
B) 20 seconds
C) 50 seconds
D) 10 seconds
- 18. A 555 IC can be operated in:
A) Astable Mode
B) Bistable Mode
C) Monostable Mode
D) All three modes
- 19. If you decrease the AREA of the plates of a capacitor, you:
A) Short circuit the capacitor
B) Increase the capacitance
C) Increase the energy storage of the capacitor
D) Decrease the capacitance
- 20. A 7805 Voltage regulator can provide a constant output voltage of:
A) 78 volts
B) 12 volts
C) 17 volts
D) 5 volts
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