71. Shifting a binary number to the left by one position is equivalent to ________.
(a) multiplying by two
(b) multiplying by four
(c) dividing by two
(d) dividing by four
72. When the output of a tri-state shift register is disabled, the output level is placed in a:
(a) float state
(b) LOW state
(c) high impedance state
(d) float state and a high impedance state
73. What is meant by parallel-loading the register?
(a) Shifting the data in all flip-flops simultaneously
(b) Loading data in two of the flip-flops
(c) Loading data in all four flip-flops at the same time
(d) Momentarily disabling the synchronous SET and RESET inputs
74. A 4-bit PISO shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.
(a) right, one
(b) right, two
(c) left, one
(d) left, three
75. In order to use a shift register as a counter, ________.
(a) the register’s serial input is the counter input and the serial output is the counter output
(b) the parallel inputs provide the input signal and the output signal is taken from the serial data output
(c) a serial-in, serial-out register must be used
(d) the serial output of the register is connected back to the serial input of the register
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