QUIZ 9 DIGITAL ELECTRONICS

Find the logic gate present inside the black box. (C02 - K3)

• OR
• AND
• NOT
• BUFFER
• XOR

If two waveforms, A and B, are applied to the AND gate inputs as in Figure, what is the resulting output waveform? (C02 - K3)

• 
• 
• 
• 
• No option is correct.

As part of an aircraft’s functional monitoring system, a circuit is required to indicate the status of the landing gears prior to landing. A green LED display turns on if all three gears are properly extended when the “gear down” switch has been activated in preparation for landing. A red LED display turns on if any of the gears fail to extend properly prior to landing. When a landing gear is extended, its sensor produces a LOW voltage. When a landing gear is retracted, its sensor produces a HIGH voltage. Choose the correct Boolean functions F1 & F2. (C03 - K4)

• F1=(A+B+C)' & F2=(A'.B'.C')
• F1=(A'.B'.C') & F2=(A+B+C)'
• F1=(A+B+C) & F2=(A'.B'.C')'
• F1=(A.B.C) & F2=(A'+B'+C')'
• No option is correct.

In the given Data Selection application, identify the block A & Block B. (C02 - K3)

• BLOCK A - Multiplexer (MUX) & BLOCK B - Demultiplexer (DEMUX)
• BLOCK A - Demultiplexer (DEMUX) & BLOCK B - Multiplexer (MUX)
• BLOCK A - Multiplexer (MUX) & BLOCK B - Multiplexer (MUX)
• BLOCK A - Demultiplexer (DEMUX) & BLOCK B - Demultiplexer (DEMUX)
• No option is correct.

Counting tennis balls going into a box from a conveyor belt. Assume that nine balls are to go into each box. Choose the appropriate combinational block to make 7-Segment LED glow based on the Binary-coded input. (C03 - K4)

• Decoder
• Demultiplexer
• Multiplexer
• Encoder
• No option is correct.

Cutaway view of one type of fixed-function IC package (dual in-line package) showing the chip mounted inside, with connections to input and output pins. Identify parts names a,b&C. (C02 - K2)

• a-Chip, b-Plastic case & c-Pins
• a-Chip, b-Pins & c-Plastic case
• a-Pins, b-Chip & c-Plastic case
• a-Plastic case, b-Chip & c-Pins
• No option is correct.

Two tanks store certain liquid chemicals that are required in a manufacturing process. Each tank has a sensor that detects when the chemical level drops to 25% of full. The sensors produce a HIGH level of 5 V when the tanks are more than one-quarter full. When the volume of chemical in a tank drops to one-quarter full, the sensor puts out a LOW level of 0 V. It is required that a single green light-emitting diode (LED) on an indicator panel show when both tanks are more than one-quarter full. Find the test point voltage levels for the current tank levels and also find the status of the LED. (C03 - K4)

• Test Point A - 5V, Test Point B - 5V, Test Point C - 0V and Green LED - ON.
• Test Point A - 5V, Test Point B - 5V, Test Point C - 0V and Green LED - OFF.
• Test Point A - 0V, Test Point B - 5V, Test Point C - 0V and Green LED - OFF.
• Test Point A - 5V, Test Point B - 0V, Test Point C - 0V and Green LED - ON.
• No option is correct.

In the given voting system application, identify the type of Adder blocks used. (C02 - K2)

• A - Full Adder, B - Full Adder and C - Parallel Adder
• A - Half Adder, B - Full Adder and C - Parallel Adder
• A - Full Adder, B - Half Adder and C - Parallel Adder
• A - Full Adder, B - Full Adder and C - Full Adder
• No option is correct.