Asynchronous Serial Communication MCQ’s

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This set of Microcontroller Multiple Choice Questions & Answers (MCQs) focuses on “Asynchronous Serial Communication”.

1. In an asynchronous mode of transmission, usually the data is sent along with the
a) the start bit
b) the stop bit
c) the start & stopbit
d) none of the mentioned

2. The _____ rate gives the frequency at which the bits are transmitted on the line.
a) bit rate
b) packet rate
c) baud rate
d) data rate

3. Asynchronous serial communication usually requires two wires for each direction plus a common ground.
a) true
b) false
c) cant be said
d) depends on the conditions

4. Baud rate is the reverse of the ________
a) baud time
b) baud period
c) bit time
d) bit period

5. A framing error occurs is the bit is ________
a) high
b) low
c) same
d) changed

6. LSB is sent first in case of the non return to zero format.
a) true
b) false
c) cant be said
d) depends on the conditions

7. Clock is transmitted in the asynchronous communication?
a) yes
b) no
c) cant be said
d) depends on the conditions

8. What is the non return to zero format?
a) the bits are either high or low and have no gaps between them
b) the bits are either high or low and have gaps between them
c) the bits are high and have gaps between them
d) the bits are low and have no gaps between them

9. There are _______ clocks in the USCI_A.
a) 1
b) 2
c) 3
d) 4

10. BITCLK16 is the ________
a) sampling clock in the undersampling mode
b) sampling clock in the oversampling mode
c) quantising clock in the undersampling mode
d) quantising clock in the oversampling mode

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