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Directions to Solve

In the following questions choose the word which is the exact OPPOSITE of the given words.

Q1: PATCHY

A Uniform

B Attractive

C Simple

D Clear

Q2:
What will be the output of the program? 
#include<stdio.h>
int main()
{
    int a = 300, b, c;
    if(a >= 400)
        b = 300;
    c = 200;
    printf('%d, %d, %d\n', a, b, c);
    return 0;
}

A 300, 300, 200

B 300, 300, Garbage

C 300, Garbage, 200

D Garbage, 300, 200

Q3: Which of the statements below best describes the basic operation of a dual-slope A/D converter?

A A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter.

B Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches.

C The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading.

D A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage, the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.

Q4: The output of a basic 4-bit input digital-to-analog converter would be capable of outputting:

A 32 different values of voltage or current that are not proportional to the input binary number

B 16 different values of voltage or current that are not proportional to the input binary number

C 32 different values of voltage or current that are proportional to the input binary number

D 16 different values of voltage or current that are proportional to the input binary number

Q5:
Referring to the given figure, what appears to be wrong, if anything, with the D/A converter and what should be done to correct the problem?

A There is nothing wrong with the converter.

B There is an offset error; if no provision is made for adjusting the offset, the op-amp may need to be changed.

C There is a nonlinearity error; the op-amp must be changed.

D The power supply voltage appears to be too high; adjust the power supply to the correct value.

Q6:
What is the current in R1 and the current in R2 for the circuit shown below?

A I1 = 0.357 mA, I2 = 0.357 mA

B I1 = 1.25 mA, I2 = 0.625 mA

C I1 = 0.625 mA, I2 = 1.25 mA

D I1 = 0.416 mA, I2 = 0.416 mA

Q7: A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and maximum input voltage of 10 V.

A The minimum sample rate will be 100,000 samples/second.

B The maximum number of samples per second will be 6250.

C The maximum sample rate will be 100,000 samples/second.

D The minimum sample rate will be 6250 samples/second.

Q8: What is the accuracy of a D/A converter?

A It is the reciprocal of the number of discrete steps in the D/A output.

B It is the deviation between the ideal straight-line output and the actual output of the converter.

C It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.

D It is the comparison between the actual output of the converter and its expected output.

Q9: Which of the equations below expresses the voltage gain relationship for an operational amplifier?

A Vin/Vout = Rout/Rin

B Vout/Vin = Rout/Rin

C Vout/Vin = –Rf/Rin

D Vout = Vin/Av

Q10: An analog quantity varies from 0–7 V and is input to a 6-bit A/D converter. What analog value is represented by each step on the digital output?

A 0.857 V

B 0.111 V

C 1.17 V

D 0.109 V