Signals and Switches Questions and Answers
Signals and Switches form the foundation of Digital Electronics, enabling the understanding of binary logic and circuit design. This section on Signals and Switches questions with answers is crucial for aspirants of GATE, DRDO, and ISRO technical exams. Here, you’ll explore digital signal behavior, voltage levels, transistor switching, and logic circuit implementations. Solving these electronics aptitude questions with explanations builds your understanding of how switching devices control logic states in digital systems. Regular practice ensures better performance in technical exams and interviews focusing on circuit-level analysis and Boolean logic.
Signals and Switches
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27 questions
11. The serial format for transmitting binary information uses:
- a single conductor
- multiple conductors
- infrared technology
- fiber-optic
12. Which device(s) have almost ideal ON and OFF resistances?
- electromechanical relays
- manual switches
- semiconductor devices (diodes and transistors)
- electromechanical relays and manual switches
13. A diode placed in parallel across a relay coil serves what function?
- to regulate input voltage
- to protect the coil from arcing
- to ensure most of the current passes through the coil
- to reduce arcing across the relay contacts
14. Serial communication can be sped up by:
- using silver or gold conductors instead of copper
- using high-speed clock signals
- adjusting the duty cycle of the binary information
- using silver or gold conductors instead of copper and high-speed clock signals
15. TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.
- TRUE
- FALSE
16. An indication of cutoff in an NPN bipolar transistor is that the:
- collector current is maximum
- collector-to-emitter voltage equals zero
- base-to-emitter voltage equals 0.7 V
- collector to emitter appears to be open
17. Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.
- positive, negative
- positive, positive
- negative, positive
- negative, negative
18. The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.
- TRUE
- FALSE
19. In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.
- time, y, voltage, x
- voltage, y, time, x
20. What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?
- 0.7 V
- 0.07 V
- 4.3 V
- 0.2 V