1. What is the maximum collector efficiency of a transformer coupled class A power amplifier?
Correct : D. 50%
2. Class C amplifiers are used as
Correct : C. rf amplifiers
3. Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150uA.
Correct : B. 150 mv
4. If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
Correct : B. decreases
5. Comparatively, power amplifier has β.
Correct : C. small
6. The driver stage usually employs amplifier.
Correct : A. class a power
7. The push-pull circuit must use operation.
Correct : B. class b
8. A complementary-symmetry amplifier has
Correct : A. one pnp and one npn transistor
9. Power amplifiers generally use transformer coupling because transformer coupling provides
Correct : C. impedance matching
10. The output transformer used in a power amplifier is a/an transformer
Correct : B. step-down
11. An emitter follower has a voltage gain that is
Correct : B. approximately equal to one
12. The input impedance of the base of an emitter follower is usually
Correct : B. high
13. The ac base voltage of an emitter follower is across the
Correct : D. emitter diode and external ac emitter resistance
14. The output voltage of an emitter follower is across the
Correct : C. load resistor
15. The differential amplifier has
Correct : C. two inputs and one output
16. The differential amplifier produces outputs that are
Correct : D. the difference of the two input voltages
17. Which factor does not affect CMOS loading?
Correct : C. output capacitance of the load gates
18. Which transistor element is used in CMOS logic?
Correct : B. mosfet
19. A Darlington pair is used for
Correct : D. high current gain
20. What is the effect of cascading amplifier stages?
Correct : B. increase in the voltage gain and reduction in the bandwidth
21. An open-drain gate is the CMOS counterpart of .
Correct : A. an open-collector ttl gate
22. The decibel gain of a cascaded amplifier equals to
Correct : B. sum of individual gains
23. The most desirable feature of transformer coupling is its
Correct : C. ability to provide impedance matching between stages
24. A transformer coupled amplifier would give
Correct : B. impedance matching
25. One of the advantages of a Darlington pair is that it has enormous
transformation capacity.
Correct : C. impedance
26. Bootstrapping is used in emitter follower configurations to
Correct : D. increase the input resistance
27. To determine the polarity of the voltage drop across a resistor, it is necessary to know
Correct : B. direction of current through the resistor
28. "Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with
Correct : D. maximum power transfer theorem
29. "In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch". The above statement is associated with
Correct : C. reciprocity theorem
30. Which of the following is non-linear circuit parameter?
Correct : A. inductance
31. A capacitor is generally a
Correct : C. linear and bilateral
32. "In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources". The above statement is associated with
Correct : C. superposition theorem
33. Kirchhoff s law is applicable to
Correct : D. both a.c. as well d.c. circuits
34. Kirchhoff s law is not applicable to circuits with
Correct : C. distributed parameters
35. The resistance LM will be
Correct : A. 6.66 q
36. For high efficiency of transfer of power, internal resistance of the source should be
Correct : B. less than the load resistance
37. Efficiency of power transfer when maximum transfer of power c
Correct : D. 50%
38. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is
Correct : C. 30 q
39. For maximum transfer of power, internal resistance of the source should be
Correct : A. equal to load resistance
40. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be
Correct : A. a voltage source
41. The circuit whose properties are same in either direction is known as
Correct : B. bilateral circuit
42. In a series parallel circuit, any two resistances in the same current path must be in
Correct : A. series with each other
43. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
Correct : A. non-linear circuit
44. A non-linear network does not satisfy
Correct : C. both homogeneity as well as superposition condition
45. An ideal voltage source has
Correct : A. zero internal resistance
46. A network which contains one or more than one source of e.m.f. is known as
Correct : C. passive network
47. The superposition theorem is applicable to
Correct : C. linear responses only
48. Application of Norton's theorem to a circuit yields
Correct : A. equivalent current source and impedance in series
49. Mill man’s theorem yields
Correct : D. equivalent voltage or current source
50. The superposition theorem is applicable to
Correct : D. current voltage and power
51. Between the branch voltages of a loop the Kirchhoff s voltage law imposes
Correct : B. linear constraints
52. A terminal where three on more branches meet is known as
Correct : A. node
53. Which of the following is the passive element ?
Correct : A. capacitance
54. Which of the following is a bilateral element ?
Correct : C. capacitance
55. A closed path made by several branches of the network is known as
Correct : B. loop
56. A linear resistor having 0 < R < °o is a
Correct : C. both current controlled and voltage controlled resistor
57. A star circuit has element of resistance R/2. The equivalent delta elements will be
Correct : B. fi?
58. A delta circuit has each element of value R/2. The equivalent elements of star circuit with be
Correct : A. rig
59. While calculating Rth in Thevenin's theorem and Norton equivalent
Correct : A. all independent sources are made dead
60. The number of independent equations to solve a network is equal to
Correct : A. the number of chords
61. The superposition theorem requires as many circuits to be solved as there are
Correct : C. sources
62. Which of the following is a concern when using CMOS type devices?
Correct : B. electrostatic discharge
63. Which of the following is not a solution to interface problems between CMOS and TTL?
Correct : B. pull-down resistor
64. Which of the following is not a common logic family used today?
Correct : A. rtl
65. The output current for a LOW output is called a(n)
Correct : B. sink current.
66. A family of logic devices designed for extremely high speed applications is called
Correct : B. ecl.
67. Unused inputs on TTL, AND, and NAND gates
Correct : D. all of the above are correct.
68. The lower transistor of a totem-pole output is OFF when the gate output is
Correct : A. high.
69. The input transistor on a TTL circuit is unusual in that it has
Correct : D. multiple emitters.
70. The difference between VOH and VIH voltages is known as
Correct : B. noise margin.
71. The upper transistor of a totem-pole output is OFF when the gate output is
Correct : D. low.
72. The major advantage of TTL logic circuits over CMOS is
Correct : A. lower propagation delay.
73. The maximum current for a HIGH output on a standard TTL gate is
Correct : B. -400 µa.
74. The maximum current for a LOW output on a standard TTL gate is
Correct : D. 16 ma.
75. The major advantage of CMOS logic circuits over TTL is
Correct : A. very low power consumption.
76. The abbreviated designation for input current with a LOW input is
Correct : C. iil.
77. Fan-out for a typical TTL gate is .
Correct : A. 10
78. In order to interface an FPGA with an external device, you must set the value of the
Correct : D. all of the above
79. The abbreviated designator for a LOW output voltage is
Correct : C. vol.
80. The lower transistor of a totem-pole output is saturated when the gate output is
Correct : B. low.
81. Typical TTL HIGH level output voltage is
Correct : C. 3.4 v.
82. The standard 74XX TTL IC family was originally developed in the
Correct : B. 1960s.
83. The minimum output voltage recognized as a HIGH by a TTL gate is
Correct : B. 2.4 v.
84. An open-collector TTL gate
Correct : A. can sink current but cannot source current.
85. The minimum input voltage recognized as a HIGH by a TTL gate is
Correct : C. 2.0 v.
86. Which of the following digital IC logic families is most susceptible to static discharge?
Correct : C. mos
87. Each input on a TTL gate is connected to the transistor's
Correct : D. emitter
88. The time it takes for an input signal to pass through internal circuitry and generate the appropriate output effect is known as
Correct : A. propagation delay
89. In a common emitter, unbypassed resister provides
Correct : A. voltage shunt feedback
90. Negative feedback in an amplifier
Correct : A. reduces gain
91. An amplifier without feedback has a voltage gain of 50, input resistance is 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is
Correct : B. 1/5kΩ
92. The fan out of a MOS logic gate is higher than that of TTL gates because of its
Correct : D. high input impedance
93. Transformer coupling can be used in amplifiers
Correct : C. either power or voltage
94. When negative current feedback is applied to an amplifier, its output impedance
Correct : A. increases
95. The quiescent current of a FET amplifier is
Correct : C. id
96. The total decibel voltage gain of two cascaded voltage amplifier where individual voltage gains are 10 and 100 is
Correct : B. 60
97. The frequency response of the combined amplifier can be compared with
Correct : D. an and gate
98. Minimum interference with frequency response can be given by
Correct : A. direct coupling
99. The impedance of a load must match the impedance of the amplifier so that
Correct : D. maximum power is transferred to the load
100. The ratio output rms power in watts to the input dc power in watts in the different amplifier class is called .