VLSI Design MCQ Multiple Choice Questions Answers - Page 2 for Practice

Q: 31. One advantage that MOSFET transistors have over bipolar transistors is

Correct Answer is: high input impedance.

Q: 32. The 54XX TTL IC series is the military version and has

Correct Answer is: a wider temperature range.

Q: 41. The abbreviation TTL means

Correct Answer is: transistor-transistor logic.

Q: 42. The CMOS series that is pin compatible with the TTL family is the

Correct Answer is: 74C00 series.

Q: 43. The difference between VOH and VIH voltages is known as

Correct Answer is: noise margin.

Q: 44. The input transistor (Q 1) of a TTL gate acts like

Correct Answer is: an AND gate.

Q: 45. The input transistor on a TTL circuit is unusual in that it has

Correct Answer is: multiple emitters.

Q: 48. The major advantage of CMOS logic circuits over TTL is

Correct Answer is: very low power consumption.

Q: 49. The major advantage of TTL logic circuits over CMOS is

Correct Answer is: lower propagation delay.

31. One advantage that MOSFET transistors have over bipolar transistors is

reduced propagation delay.
higher switching speed.
high input impedance.
low input impedance.

32. The 54XX TTL IC series is the military version and has

a wider temperature range.
more stringent power supply requirements.
higher current output capability.
all of the above.

33. The abbreviated designation for input current with a HIGH input is

VIH.
IIH.
IIL.
IOL.

34. The abbreviated designation for input current with a LOW input is

VIH.
IIH.
IIL.
IOL.

35. The abbreviated designation for output current with a HIGH output is

IOH.
IIL.
IIH.
IOL.

36. The abbreviated designation for output current with a LOW output is

OOL.
IOL.
IOH.
IIH.

37. The abbreviated designator for a HIGH input voltage is

VOH.
VIH.
VIL.
VOL.

38. The abbreviated designator for a HIGH output voltage is

VIL.
VOH.
VIH.
VOL.

39. The abbreviated designator for a LOW input voltage is

VIL.
VOH.
VOL.
VIH.

40. The abbreviated designator for a LOW output voltage is

VOH.
VIL.
VOL.
VIH.

41. The abbreviation TTL means

transistor-transceiver latch.
three-transistor logic.
two-transistor logic.
transistor-transistor logic.

42. The CMOS series that is pin compatible with the TTL family is the

74C00 series.
4000 series.
5400 series.
7400 series.

43. The difference between VOH and VIH voltages is known as

input margin.
noise margin.
output differential.
input level.

44. The input transistor (Q 1) of a TTL gate acts like

a NAND gate.
a NOR gate.
an AND gate.
an OR gate.

45. The input transistor on a TTL circuit is unusual in that it has

multiple bases.
no collector
no base
multiple emitters.

46. The lower transistor of a totem-pole output is OFF when the gate output is

HIGH.
malfunctioning.
LOW.
over driven.

47. The lower transistor of a totem-pole output is saturated when the gate output is

HIGH.
LOW.
malfunctioning.
over driven.

48. The major advantage of CMOS logic circuits over TTL is

very low power consumption.
the ability to produce several output voltage levels.
lower propagation delay.
much higher propagation delay.

49. The major advantage of TTL logic circuits over CMOS is

lower propagation delay.
the ability to output higher voltages.
more modern design.
very low power consumption.

50. The maximum current for a HIGH output on a standard TTL gate is

-10 ÂµA.
-400 ÂµA.
-1 ÂµA.
-10 mA.

51. The maximum current for a LOW output on a standard TTL gate is

16 ÂµA.
40 mA.
100 ÂµA.
16 mA.

52. The maximum input voltage recognized as a LOW by a TTL gate is

2.4 V.
0.8 V.
0.0 V.
0.4 V.

53. The maximum output voltage recognized as a LOW by a TTL gate is

2.0 V.
0.8 V.
2.4 V.
0.4 V. 3

54. The minimum input voltage recognized as a HIGH by a TTL gate is

0.8 V.
2.4 V.
2.0 V.
5.0 V.

55. The minimum output voltage recognized as a HIGH by a TTL gate is

0.8 V.
2.4 V.
5.0 V.
2.0 V.

56. The noise margin for a standard TTL gate is

1.0 V.
0.4 V.
1.4 V.
0.8 V.

57. The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called

dissipation.
propagation.
fan-out.
SSI.

58. The original CMOS line of circuits is the

5400 series.
4000 series.
74C00 series.
74HCOO series.

59. The output current capability for a HIGH output condition is called a(n)

source current.
exit current.
sink current.
fan-out.

60. The output current for a LOW output is called a(n)

exit current.
sink current.
ground current.
fan-out.