1) When can a LCD display the text form of data?
a. only when RS line is high
b. only when RW line is high
c. only when RS line is low
d. only when RW line is low
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Answer
Explanation
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ANSWER: only when RS line is high
Explanation:
No explanation is available for this question!
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2) What does the RAM location at 44H indicates about the seven segment code?
a. 7-segment code for the third character
b. 7-segment code for the fourth character
c. Display of select code for third display
d. Display of select code for fourth display
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Answer
Explanation
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ANSWER: 7-segment code for the third character
Explanation:
No explanation is available for this question!
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3) How are the port pins of microcontroller calculated for time-multiplexing types of display?
a. 4 + number of digits to be displayed
b. 4 raised to the number of digits to be displayed
c. 4 - number of digits to be displayed
d. 4 x number of digits to be displayed
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Answer
Explanation
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ANSWER: 4 + number of digits to be displayed
Explanation:
No explanation is available for this question!
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4) What is the purpose of blanking (BI) associated with the 7-segment display operations?
a. To turn ON the display
b. To turn OFF the display
c. To pulse modulate the brightness of display
d. To pulse modulate the lightness of display
a. B & C
b. A & D
c. A & B
d. C & D
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Answer
Explanation
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ANSWER: B & C
Explanation:
No explanation is available for this question!
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5) Which errors are more likely to get generated by conversion time and ADC resolution respectively in accordance to the digital signal processing?
a. Sampling & Quantization Errors
b. Systematic & Random Errors
c. Overload & Underload Errors
d. None of the above
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Answer
Explanation
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ANSWER: Sampling & Quantization Errors
Explanation:
No explanation is available for this question!
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6) Which pin/signal of ADC AD571 interfacing apprises about the accomplishment of data reading in the microcontroller so as to indicate ADC to get ready for the next data sample?
a. BLANK /CONVERT (high)
b. BLANK/DR (low)
c. DATA READY (DR)
d. All of the above
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Answer
Explanation
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ANSWER: BLANK /CONVERT (high)
Explanation:
No explanation is available for this question!
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7) Which factors indicate the necessity of sample and hold circuit in the process of analog-to-digital conversion?
a. Instantaneous variation in an input signal
b. Analog-to-digital conversion time
c. Both a & b
d. None of the above
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Answer
Explanation
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ANSWER: Both a & b
Explanation:
No explanation is available for this question!
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8) Where do the power gets dissipated during the gradual decay of an inductor current (upto zero value) by turning OFF the transistor in an electromechanical relay?
a. Internal resistance of the coil
b. Internal Diode resistance
c. Both a & b
d. None of the above
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Answer
Explanation
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ANSWER: Both a & b
Explanation:
No explanation is available for this question!
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9) Which diodes are employed in the electromechanical relays since the inductor current cannot be reduced to zero?
a. Tunnel Diode
b. Shockley Diode
c. Freewheeling Diode
d. Zener Diode
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Answer
Explanation
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ANSWER: Freewheeling Diode
Explanation:
No explanation is available for this question!
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10) In an electromechanical relay, the necessity of connecting an external base resistance arises only _________
a. in the presence of an internal pull-up resistor
b. in the absence of an internal pull-up resistor
c. in the absence of an internal push-up resistor
d. in the presence of an internal push-up resistor
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Answer
Explanation
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ANSWER: in the absence of an internal pull-up resistor
Explanation:
No explanation is available for this question!
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