Microprocessors and Microcontrollers (3160914) MCQs

MCQs of Applications and design of microcontroller based systems

Showing 21 to 30 out of 40 Questions
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21.

While programming the ADC0808/0809 IC what steps are followed?

(a)

select the analog channel, start the conversion, monitor the conversion, display the digital results
(b)

select the analog channel, activate the ALE signal (L to H pulse), start the conversion, monitor the conversion, read the digital results
(c)

select the analog channel, activate the ALE signal (L to H pulse), start the conversion, monitor the conversion, read the digital results
(d)

select the channel, start the conversion, end the conversion
Answer:

Option (b)

22.

In ADC0808/0809 IC which pin is used to select Step Size?

(a)

Vref
(b)

Vin
(c)

Vref/2 & Vin
(d)

None of the mentioned
Answer:

Option (a)

23.

What is the difference between ADC0804 and MAX1112?

(a)

ADC0804 has 8 bits and MAX1112 has 1 bit for data output
(b)

ADC0804 is used for adc and dac conversions whereas MAX1112 is used for serial data transmissions
(c)

ADC0804 has 32 bits and MAX1112 has 3 bit for data output
(d)

None of the mentioned
Answer:

Option (a)

24.

Which of the following statements are true about DAC0808?

(a)

parallel digital data to analog data conversion
(b)

it has current as an output
(c)

all of the mentioned
(d)

none of the mentioned
Answer:

Option (a)

25.

8 input DAC has ________

(a)

8 discrete voltage levels
(b)

64 discrete voltage levels
(c)

124 discrete voltage levels
(d)

256 discrete voltage levels
Answer:

Option (d)

26.

INTR, WR signal is an input/output signal pin?

(a)

both are output
(b)

both are input
(c)

one is input and the other is output
(d)

none of the mentioned
Answer:

Option (c)

27.

What is the function of the SCLK pin in MAX1112?

(a)

It is used to bring data in
(b)

It is used to bring data out and send in the control byte, one at a time
(c)

It is used to get output clock
(d)

It is used to get serial output
Answer:

Option (b)

28.

What is the principle on which electromagnetic relays operate?

(a)

electromagnetic induction
(b)

motor control
(c)

switching
(d)

none of the mentioned
Answer:

Option (a)

29.

What are DPDT relays?

(a)

Single pole, single throw
(b)

Single pole, double throw
(c)

Double pole, double throw
(d)

None of the mentioned
Answer:

Option (c)

30.

Why are solid-state relays advantageous over electromechanical relays?

(a)

they need zero voltage circuit
(b)

they need less current to be energised
(c)

they need less voltage to be energised
(d)

none of the mentioned
Answer:

Option (b)

Showing 21 to 30 out of 40 Questions
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