RADAR Principles
In the circuit shown in Fig. 8A4, U5 pins 1 and 4 are high and both are in the reset state. Assume one clock cycle occurs of Clk A followed by one cycle of Clk B. What are the output states of the two D-type flip flops?
-
Pin 5 low, Pin 9 low.
-
Pin 5 high, Pin 9 low.
-
Pin 5 low, Pin 9 high.
-
Correct AnswerPin 5 high, Pin 9 high.
This question does not yet have an explanation!
Register to add one
If more light strikes the photodiode in Fig. 8A5, there will be:
-
Less diode current.
-
No change in diode current.
-
Correct AnswerMore diode current.
-
There is wrong polarity on the diode.
Photodiode resistance drops when light strikes the diode, so more current flows and Answer C. is the right one.
Last edited by jahman. Register to edit
In the circuit shown in Fig. 8A6, which of the following is true?
-
With A and B high, Q1 is saturated and Q2 is off.
-
Correct AnswerWith either A or B low, Q1 is saturated and Q2 is off.
-
With A and B low, Q2 is on and Q4 is off.
-
With either A or B low, Q1 is off and Q2 is on.
This question does not yet have an explanation!
Register to add one
What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?
-
4,700 ohms.
-
155 ohms.
-
Correct Answer77 ohms.
-
10,000 ohms.
If If(max) = 40mA and V = 5V - 1.9V = 3.1V, then according to Ohms Law:
V = I x R
so:
R = V / I
R = 3.1V / 0.04A
R = 77Ω
Answer C. is the right answer.
Last edited by jahman. Register to edit
The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
-
The ALU is used for address decoding.
-
General registers are used for arithmetic manipulations.
-
The control unit executes arithmetic manipulations.
-
Correct AnswerAddress pointers are contained in the general registers.
General Registers can contain, inter alia, address pointers, so "Address pointers are contained in the general registers." is correct.
The distractors:
- The ALU - Arithmetic Logic Unit is used for arithmetic
- General Registers are not used for arithemtic.
- The Control Unit synchronizes the internal components of a microprocessro but does not perform arithmetic operations.
Last edited by kd7bbc. Register to edit
You are troubleshooting a component on a printed circuit board in a RADAR system while referencing the Truth Table in Fig. 8A8. What kind of integrated circuit is the component?
-
Correct AnswerD-type Flip-Flop, 3-State, Inverting.
-
Q-type Flip-Flop, Non-Inverting.
-
Q-type Directional Shift Register, Dual.
-
D to Q Convertor, 2-State.
The IC - Integrated Circuit is a FLip-Flop because when the input Dn goes High the corresponding output Q-Bar goes Low and flipping back and forth from High to Low and Low to High is what Flip-Flops are meant to do.
The Dn input stands for the nth Data input, so it's a D-Type Flip-Flop and this means the right answer is A.
Last edited by jahman. Register to edit