41. For signals which are updated frequently _____ is used.
A. static storage
B. dynamic storage
C. static and dynamic storage
D. buffer
Answer: B
For signals which are updated frequently dynamic storage elements are used. It can be done at < 0.25 msec intervals.
42. Clock line drivers have ________ source of drive.
A. one
B. two
C. three
D. none
Answer: A
Clock line drivers have one source of drive. The speed of bipolar drivers is not fully realized with bus lines.
43. Bus structures carry _______
A. data signals
B. control signals
C. data and control signals
D. in and out signals
Answer: C
Bus structures carry both data and control signals. They are generally long and connected to and through a significant number of circuits and subsystems.
44. Bus has _______ different classes.
A. two
B. three
C. four
D. five
Answer: B
The bus has three different classes and those are passive, active, and precharged.
45. In the passive bus, drivers are connected through
A. series switches
B. parallel switches
C. cascade switches
D. wires
Answer: A
In the passive bus, drivers are connected through a series of switches. It is a floating rail to which signals may be connected by drivers through a series of switches.
46. The bus rail in active buses has ________
A. NAND connection
B. AND connection
C. NOR connection
D. OR connection
Answer: C
The bus rail in the active bus has a NOR connection which has a common pull-up and n-type pull-down transistors.
47. Low L: W ratio results in ____ transistors.
A. smaller
B. bigger
C. size doesn’t depend on the ratio
D. less effective
Answer: B
The size of the transistor can be made large by a small L: W ratio and thus it has a low resistance.
48. Features which does not affect bus design are ________
A. cross-talk
B. delay factors
C. non-delay factors
D. cross-talk and delay factors
Answer: C
Cross-talk and delay factors are of significance in bus design. This occurs when many signals on the chip are propagated.
49. Which device is frequency dependent?
A. nMOS
B. CMOS
C. BiCMOS
D. pMOS
Answer: B
CMOS is frequency-dependent whereas BiCMOS is not and it exhibits a constant value for power dissipation.
50. If the current density exceeds a threshold value then metal atoms move in
A. direction of the current
B. opposite direction of the current
C. doesn’t depend on the direction of current
D. direction of the voltage
Answer: A
If the current density exceeds a threshold value then metal atoms start to move in the direction of the current.
