Answer to Question 6

Back

1.(A) Complete the table.  Two have been done as an example.

S1

S2

S3

S4

Result

1

0

0

1

Motor goes forward

0

1

1

0

 Motor goes backward

0

0

0

0

 Motor free-wheels

0

1

0

1

 Motor brakes

1

0

1

0

Motor brakes

1

1

0

0

 Short circuit

0

0

1

1

 Short circuit

1

1

1

1

 Short circuit