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