Q.1

The output of a phototransister is determined by the presence or absence of light at its base input.

  • True
  • False
Q.2

TTL requires a constant supply voltage of 8.0 V.

  • True
  • False
Q.3

The term race condition describes the time that an active signal must be present at the input to a flip-flop before an active clock edge is applied.

  • True
  • False
Q.4

A Schmitt trigger has a positive feedback circuit and experiences a phenomenon called hysteresis.

  • True
  • False
Q.5

A transfer function graph illustrates the most important specifications for the Schmitt trigger devices.

  • True
  • False
Q.6

The input levels to a flip-flop must be maintained for a minimum time period both before and after the edge of the clock signal is applied.

  • True
  • False
Q.7

A series RC circuit can be used to generate a power-up (automatic) reset signal.

  • True
  • False
Q.8

There is no way to eliminate the effects of a switch bounce.

  • True
  • False
Q.9

The 7805 will get very hot if your circuit draws more than 0.5 A.

  • True
  • False
Q.10

Pull-up resistors and pull-down resistors are used to keep a floating terminal HIGH.

  • True
  • False
Q.11

What would be the output voltage of a 7814 voltage regulator?

  • –14 V dc
  • +14 V dc
  • –8 V dc
  • +8 V dc
Q.12

What is the major advantage of the J-K flip-flop over the S-R flip-flop?

  • The J-K flip-flop is much faster.
  • The J-K flip-flop does not have propagation delay problems.
  • The J-K flip-flop has a toggle state.
  • The J-K flip-flop has two outputs.
Q.13

What is the difference between setup time and hold time?

  • Setup time occurs after the active clock edge, hold time occurs before the active clock edge.
  • Setup time occurs before the active clock edge, hold time occurs after the active clock edge.
  • Setup time and hold time both occur at the active clock edge.
Q.14

A settable flip-flop's normal starting state when power is first applied to a circuit is always the ________ state.

  • reset
  • set
  • toggle
  • dual
Q.15

The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.

  • LOW, float
  • HIGH, float
  • clock, float
  • pulsed, float
Q.16

Setup time specifies:

  • the minimum time the control levels need to be maintained on the inputs prior to the triggering edge of the clock in order to be reliably clocked into the flip-flop
  • the maximum time interval required for the control levels to remain on the inputs before the triggered edge of the clock in order for the data to be reliably clocked out of the flip-flop
  • how long the operator has to get the flip-flop running before the maximum power level is exceeded
  • how long it takes the output to change states after the clock has transitioned
Q.17

Decoupling capacitors should be tied from VCC on one device to ground on a different device.

  • True
  • False
Q.18

One example for the use of a Schmitt trigger is as a(n):

  • switch debouncer
  • racer
  • astable oscillator
  • transition pulse generator
Q.19

Define a race condition for a flip-flop.

  • The inputs to a trigger device are changing slightly before the active trigger edge.
  • The inputs to a trigger device are changing slightly after the active trigger edge.
  • The inputs to a trigger device are changing at the same time as the active trigger edge.
Q.20

The ________ circuit overcomes the problem of switching caused by jitter on the inputs.

  • astable multivibrator
  • monostable multivibrator
  • bistable multivibrator
  • Schmitt trigger
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