NETWORK ANALYSIS AND SYNTHESIS QUESTION4

CIRCUITS AND NETWORK DESIGN

1. In push-pull amplifier output

a. The odd harmonics are eliminated

b. The even harmonics are eliminated

c. Both odd and even harmonics are eliminated

d. None

2. Which is /are invalid statement(s)?

I. A wide reject filter is also referred as notch filter

II. A wide band reject filter is derived from low pass and high pass filters section in parallel

III. A wide band reject filter is derived from low pass filter section in series

a. I & II

b. II & III

c. I & III

d. III only

3. A Gyrator is a two-port device that can be used to simulate

a. A resistance

b. A capacitance

c. An inductor

d. Both a & b

4. The phase relationship between the wave form v=100sin(ώt+30) and i=10 sin(ώt+60) is

a. I leads V by 30

b. I leads V by 60

c. I leads V by 90

d. I leads V by 120

5. What is the period of a sinusoidal waveform having a 100 MHz frequency?

a. 10 ns

b. 10 ms

c. 10 s

d. 100 s

6. What is the amplitude of a voltage wave v=200 sin377ώt?

a. 200 rad/s

b. 377 rad/s

c. 60 rad/s

d. 16.67 rad/s

7. The capacitance of a capacitor having 50 reactance at 60 Hz is found to be

a. 0.86 µF

b. 36 µF

c. 49.6 µF

d. 53.05 µF

8. What is the reactance of a 320µF capacitor at dc?

a. Zero

b. Infinity

c. 160 ohm

d. 200 ohm

9. The ampere-turn dot rule of an ideal transformer states that the algebraic sum of the ampere turns is equal to

a. Infinity

b. Unity

c. Zero

d. Less than 2 always

10. The RF noise in o-amp

a. Increase with increase in frequency

b. Decrease with increase in frequency

c. In independent of frequency variations

d. Remains constant over a wide range of frequency

11. Which type of op-amp configuration has best immunity to induced noise?

a. Investing amplifier

b. Non-inverting amplifier

c. Zero-crossing amplifier

d. Differential amplifier

12. Common mode rejection ratio

a. Increases with increase in frequency

b. Decreases with increase in frequency

c. Remains independent of frequency variation

d. Remains constant over a wide range of frequencies

13. A circuit draws 3 A current at 70 V and consumes 140 W power. The power factor is found to be

a. 0.67

b. 0.42

c. 0.89

d. 1.00

14. If IB1 and IB2 are the base currents of an op-amp that are equal to 10 µA and 5µA. then the input offset current is found to be

a. 5 µA

b. 10 µA

c. 15 µA

d. 2 µA

15. A differential amplifier can amplify

a. Only dc signal

b. Only ac signal

c. Both dc and ac signal

d. None

16. Slew rate distortion of sine wave occurs

a. When the initial slope of the sine wave is smaller than slew rate

b. When the initial slope of the sine wave is greater than slew rate

c. When the initial slope of the sine wave is equal to slew rate

d. When the initial slope of the sine wave is zero

17. In IC741C, the letter C stands for

a. Compact grade

b. Commercial grade

c. Custodian grade

d. Comfort grade

18. If the op-amp is not saturated, then

a. Its two input voltages are not equal

b. Its two input voltages are equal

c. The error voltage deviates from zero

d. None

19. A Schmitt trigger

A.Is a comparator with hysteresis

B.Has two trip points

C.Prevents false triggering by unwanted noise voltage at the input

D.Generates perfect sine output waveform

Among the above which is/are valid statements?

a. A,B,C

b. B,C,D

c. A,C,D

d. A,B,C,D

20. An integrator converts a rectangle wave to

a. A sine wave

b. Square wave

c. A triangular wave form

d. Staircase waveform

21. By cascading, a relaxation oscillator and an integrator we can generate

a. Sine wave

b. Triangular wave

c. Square wave

d. Staircase wave

22. In transformer coupling, the efficiency is found to be equal to

a. 100%

b. 75%

c. 50%

d. 25%

23. An ideal voltage source has

a. Zero internal resistance

b. Infinite internal resistance

c. A load dependent voltage

d. A load dependent current

24. The Thevenin resistance is

a. Always less than Norton’s resistance

b. Always greater than Norton’s resistance

c. Always equal in value and same in their physical location in the circuit

d. Always equal in value but different in their physical location in the circuit

25. Suppose an intrinsic silicon bar has 1 million free electrons at room temperature. If the temperature rises at 50 how many holes will be there?

a. Fewer than 1 million

b. 1 million

c. More than 1 million

d. Can’t say(infinity)

26. For either germanium or silicon diodes, the barrier potential decreases ------ mV for each degree celsius rise

a. 1

b. 2

c. 3

d. 4.5

27. The formal equivalent for mho is

a. Volts/div

b. Ohm

c. Lumen

d. Siemens

28. Which is the most preferred form of bias for JFET amplifier?

a. Self bias

b. Voltage-divider bias

c. Two-supply source bias

d. Gate bias

29. 6 ohms and 5 ohms resistors are connected in parallel and the combination is in series with a 10 ohms resistor. The resistance is

a. 12.72 ohms

b. 21 ohms

c. 11 ohms

d. 1 ohms

30. The output of a push-pull amplifier has

a. No even harmonics

b. No odd harmonics

c. Both even and odd harmonics

d. Even harmonics

31. The main component of a tank circuit are

a. R &C

b. L & C

c. R &L

d. L and semiconductor material

32. For a non-inverting amplifier, the phasor shift required is around

a. 60

b. 90

c. 180

d. 360

33. Which of the following is incorrect with respect to push-pull amplifier?

a. There is a dc current flow at the output

b. Is operated in class B

c. Even harmonics are cancelled out

d. There is no quiescent current

34. I’s are

a. Quite reliable

b. Economical

c. Not easy to trouble shoot

d. All

35. Consider the following statements

Statement 1: A resistor can be used for the load in a collector circuit of a transistor amplifier

Statement 2: The required dc supply voltage for an amplifier is 9V

Which of the following statements is /are valid?

a. Statement I

b. Statement II

c. Both

d. Neither I or II

36. Which circuit has its output from the emitter terminal?

a. Common base

b. Common collector

c. Emitter follower

d. None

37. In a resistance loaded amplifier, the high frequency response is reduced due to

a. Total parallel capacitance (CT)

b. Coupling capacitor (CC)

c. Both CT and CC

d. None

38. A power MOSFET has three terminals called

a. Collector, emitter , and base

b. Drain, source and gate

c. Drain, source and base

d. Collector, emitter and gate

39. The common emitter amplifier has highest gain for

a. Voltage

b. Current

c. Both voltage and current

d. Low impedance loads only

40. A field effect transistor is operated at a gate to source voltage of about -2v.The ac input signal is 1.2v. The class of operation is

a. A

b. B

c. C

d. AB

41. Identify which one of the following doesn’t use coupling capacitor.

a. Transformer coupled circuit

b. Single tuned circuit

c. Resistance loaded circuit

d. Impedance coupled circuit

42. The ratio alpha of a transistor compares

a. Collector to base current

b. Collector to emitter current

c. Base to emitter current

d. AC to DC current

43. The typical value of alpha of a transistor is

a. 1.23

b. 1.00

c. 0.98

d. 0.67

44. In order to achieve polarity inversion of the input signal how many CE amplifiers have to be cascaded?

a. One

b. Two

c. Three

d. Two or three

45. A push-pull audio amplifier is basically operated in

a. Class A

b. Class B

c. Class AB

d. Class C

46. Quasi complementary symmetry amplifier means

a. The driver stages are NPN and PNP but both output stages are NPN

b. The driver stages are NPN and PNP but both output stages are PNP

c. The driver and output stages are all NPN

d. The driver and output stages are all PNP

47. The voltage and current in an ac circuit is V=100 sin(867t-30) V and I=6sin(867t+30). What is the power factor?

a. 30

b. 60

c. 75

d. 90

48. The voltage across 20 microfarad capacitor rises at a constant rate of 10V/ms. Then the current through the capacitor is

a. 150 mA

b. 200 mA

c. 2 mA

d. 0.5 mA

49. The energy stored in an inductor L having a current I is given by the equation

a. LI

b. L(I*I/2)

c. 2LI*I

d. IL/2

50. What is the angular frequency of a waveform having a period of 2ms?

a. 3.14 rad/s

b. 31.14 rad/s

c. 3141 rad/s

d. 0.3141 rad/s

51. Given A=2+j2. Expressing it in polar form we get

a. A=√8

b. A=√8∟45

c. A=√6

d. A=√6∟45

52. FET’s are used as amplifier to get

a. High input impedance

b. Low input impedance

c. High output impedance

d. Low output impedance

53. Which of the following exhibits very high input impedance

a. Diode

b. Transistor

c. FET

d. None

54. FET input stage is used in an amplifier to increase its

a. Input impedance

b. Output impedance

c. Frequency bandwidth

d. Power handling capacity

55. Wein bridge oscillator is basically a

a. Pulse generator

b. Square wave generator

c. Sine wave generator

d. Triangular wave generator

56. The type of oscillator circuit that makes use of tapped coil in its tuned circuit is

a. Crystal oscillator

b. Hartley oscillator

c. Colpitt’s oscillator

d. Tuned oscillator

57. An integrated circuit is

a. A complicated circuit

b. Fabricated on a tiny silicon chip

c. Costlier than a single transistor

d. A summing device

58. The ratio of the readings of two watt meters connected to measure power in a balanced 3 phase load is 5:3 and the load is inductive. The power factor of the load is

a. 0.917 leads

b. 0.917 lags

c. 0.617 leads

d. 0.617 lags

59. An op-amp IC has

a. Three basic terminal

b. Four basic terminal

c. Six basic terminals

d. Five basic terminals

60. A clipper always

a. Needs a dc source

b. Needs an ac source

c. Clips any part of the input signal

d. Clips only the lower part of the input signal

61. A relaxation oscillator is one

a. Which produces sine output waveform

b. Which produces non-sinusoidal output waveforms

c. Relaxes infinitely

d. Oscillates between two fixed reference points to produce sine output

62. The gain of the o-amp is nearly

a. 10^3

b. 10^5

c. 10^6

d. 10^9

63. Power supply rejection ratio (PSRR) of an op-amp should be

a. Ideally unity

b. Zero

c. As large as possible

d. As small as possible

64. The major merit of active filters is that they can beralized without using

a. Resistors

b. Op-amps

c. Capacitors

d. Inductors

65. Circuit used for production of delay is

a. Schmitt trigger

b. Integrator

c. Differentiator

d. Bistable multivibrator

66. A blocking oscillator is a/an

a. Generator sine wave form

b. Triggered oscillator circuit

c. Amplifier with negative feedback

d. Circuit that produces sharp and narrow pulses

67. Wein bridge oscillator is basically

a. Staircase generator

b. Square wave generator

c. Sine wave generator

d. Triangular wave generator

68. The frequency of wein bridge oscillator is given by the formula

a. 1/2πRC

b. 1/√2πRC

c. 1/2π√RC

d. 1/√RC

69. The main advantage of using an instrumentation amplifier over an ordinary op-amp is

a. Higher values of CMMR

b. Lower noise figure

c. Simple gain adjust

d. Better slew rate

70. If the differential and common mode gains of a differential amplifier are 50 and 0.2 respectively, then the CMRR will be

a. 10

b. 49.8

c. 50.2

d. 250

71. The most stable sine wave oscillator is

a. Colpitt’s

b. Phase shift

c. Hartley

d. Crystal

72. Find the value of inductance of a low pass RL filter having R=1.5 Kohms and a cut-off frequency of 1600 KHz

a. 130 mH

b. 149 mH

c. 152 mH

d. 14.9 mH

73. Determine the Q of a coil whose resistance and inductance are 10 ohm and 0.04 H respectively, if the coil is at resonance 2 KHz

a. 40.26

b. 42.36

c. 49.05

d. 50.27

74. Resonance is the condition that

a. Exists in ac circuit under steady state when the input current is in phase with the output current

b. Exists in ac circuit under steady state when the input current is in phase with the output voltage

c. Exists in ac circuit under steady state when the input current is in phase with the input voltage

d. It exists in dc circuit

75. The reciprocal of the phasor j is found to be

a. J

b. I

c. 0

d. –j

76. For a certain two winding transformer N1=100, N2=150 and K=0.43. The reluctance seen by the two windings is 320 ampere turns per weber. The mutual inductance between the two windings is found to be

a. 20.16 H

b. 143 H

c. 146 H

d. 150.62 H

77. In a series aiding connection, two coupled coils have an equivalent inductance LA; in a series opposing connection LB. The expression for M in terms of LA and LB is given by

a. M=(1/2)(LA-LB)

b. M=(LA-LB)

c. M=(1/4)(LA-LB)

d. M=(LA+LB)

78. What is the condition for the input current and the terminal voltage of an RLC series circuit to be in phase with each other?

a. The circuit must be purely resistive

b. The imaginary part of the impedance must be infinite

c. The circuit must not have any load

d. The circuit must be purely capacitive

79. Convert A=4∟-30 to its rectangular form

a. 2.164+j2.0

b. 3.464-j2.0

c. 2.164-j2.0

d. 3.464+j2.0

80. If a common emitter stage is directly connected to an emitter follower, the number of coupling capacitor required is

a. One

b. Two

c. Three

d. Zero

81. If the load resistance of an emitter follower circuit is made large, then the external ac emitter resistance is equal to

a. DC emitter resistance

b. DC collector resistance

c. Impedance of base

d. Impedance of emitter

82. The feedback resistor in an emitter terminal in an amplifier circuit

a. Enhances the input impedance

b. Stabilizes the voltage gain

c. Reduces the distortion

d. All

83. Base bias tends to use the transistor as

a. An amplifier

b. A switch

c. An impedance matcher

d. A power stabilizer

84. Which has the largest period?

a. 5.5 KHz

b. 5.5 MHz

c. 5.5 GHz

d. 5.501 Hz

85. The phase shift oscillator

a. Is different from twin-T oscillator

b. Works well over a range of frequency

c. Works well at one frequency

d. None

86. The angstrom oscillator

a. Uses coupling capacitor to produce feedback signal

b. Uses inductor to produce feedback signal

c. Use RC network to produce feedback signal

d. Uses transformer to produce feedback signal

87. For a resonant tank circuit with a Q greater than 10, the frequency of oscillations will be within---- percent of the ideal resonance frequency

a. 1

b. 5

c. 25

d. 100

88. The best way to reduce motor boating sound is

a. To add bypass capacitor to the power supply line

b. Reduce the Thevenin impedance

c. Use power supply with extremely small Thevenin resistance

d. Use high current power source

89. Two capacitances in series always produce a capacitance

a. Smaller than the sum of their capacitances

b. Smaller than either

c. Larger than the sum of their capacitances

d. Larger than either

90. The formula for the fundamental frequency of a crystal is given by

a. F=kt

b. F=t/k

c. 1/f=t/k

d. 1/f=k/t

91. The wein bridge oscillator is not suited

a. Above 1 MHz

b. Lower frequency

c. Below 50 KHz

d. Above 10 MHz

92. Which his otherwise called as notch filter?

a. Hartley circuit

b. Colpitt’s circuit

c. Wein bridge circuit

d. Phase shift circuit

93. In the circuits such as peak detector positive limiter op-amp is used to

a. Reduce the knee voltage by factor A

b. Enhance the knee voltage by factor A

c. Maintain the knee voltage by factor A

d. None

94. By cascading a relaxation oscillator and an integrator we can generate

a. Square wave

b. Triangular wave

c. Saw tooth wave

d. Sine wave

95. A Schmitt trigger has

a. One trip point

b. Two trip points

c. Three trip points

d. O trip points

96. Consider the circuit . If Vin=rectangular waveform then Vo will be

fig:

a. Sine

b. Saw tooth

c. Square

d. Triangular

97. In controlled current source with op-amps, the circuit acts like a

a. Current amplifier

b. Voltage amplifier

c. Current to voltage converter

d. Voltage to current converter

98. If the op-amp is not saturated, its two input voltages are

a. Equal

b. Unequal

c. Ideally zero

d. None

99. An instrumentation amplifier has a

a. High output impedance

b. High power gain

c. High CMRR

d. High output voltage

100. The error voltage of ideal op-amp and practical op-amp are -------- and ------- respectively.

a. Zero, very small

b. Small large

c. Large, zero

d. Large, large

101. The dominant critical frequency of an op-amp depends on

a. Coupling capacitance

b. Bypass capacitance

c. Base emitter capacitance

d. Compensation capacitance

102. IC 741 has unity-gain frequency of

a. 1 MHz

b. 1 KHz

c. 1 Hz

d. 0.1 Hz

103. An IC 741 has an input voltage of 1µ V then the output voltage will be

a. 1 V

b. 10 V

c. 0.5 V

d. 0.1 V

104. Slew rate distortion of a sine wave occurs when

a. The initial slope of the sine wave is smaller than the slew rate

b. The initial slope of the sine wave is greater than the slew rate

c. The initial slope of the sine wave is equal to the slew rate

d. The initial slope is the sine wave and slew rate are equal to zero exactly

105. For the operation of enhancement N-channel MOSFET, value of the gate voltage has to be equal to

a. Zero

b. Unity

c. Positive

d. Negative

106. Transformer works as an open switch when its emitter junction is – and collector junction is --------------.

a. Forward biased, forward biased

b. Reverse biased, reverse biased

c. Forward biased, reverse biased

d. Reverse biased, forward biased

107. Constantan is a/an

a. Alloy

b. Metal

c. Non-metal

d. Isotope

108. A class B push-pull emitter follower amplifier employs

a. Two n-p-n transistors

b. Two p-n-p transistors

c. One n-p-n and one p-n-p transistors

d. One n-p-n transistor only

109. The voltage in a capacitor depends on

a. Integral of the current through it

b. Differentiation of current through it

c. Current as such

d. Log of current through it

110. Which one of the following is a non-dissipative passive element?

a. Ceramic capacitor

b. Mica capacitor

c. Paper capacitor

d. Pure capacitor

111. Consider the statements:

Statement I: A parallel circuit acts as a voltage divider

Statement II: A series circuit acts as a current divider

Which one of the following is valid?

a. Both statements I and II

b. Either statement I or II

c. Statement I only

d. Statement II only

112. In general if we have 3 number of branches and N number of nodes including the reference node then the number of linearly independent mesh equation is given by

a. M=B+N+1

b. M=B+N+1

c. M=B-(N+1)

d. M=B-N-1

113. The nodal method of circuit analysis is based on

a. Kirchoff’s current law

b. Kirchoff’s voltage law

c. Kirchoff’s voltage law and ohm’s law

d. Kirchoff’s current law and ohm’s law

114. Which theorem states that in any network if the voltage sources V1 , V2----- Vn in series with internal resistances R1, R2, R3. Rn , respectively, are in parallel, then the sources can be replaced by a single voltage source in series with single resistance R?

a. Millmann’s theorem

b. Tellegen’s theorem

c. Compensation theorem

d. Norton’s theorem

115. A sine wave has a frequency of 50 KHz. How many cycles does it complete in 20ms?

a. 10^2 cycles

b. 10^3 cycles

c. 10^4 cycles

d. 10^6 cycles

116. A sine wave has a peak value of 12 V and RMS value of 8.48 volts, then the crest value is given by

a. 1.415

b. 0.707

c. 20.48

d. 3.520

117. In a parallel RL circuit

a. The inductive current is real and lies on j axis

b. The inductive current is imaginary and lies on +j axis

c. The inductive current is real and lies on –j axis

d. The inductive current is imaginary and lies on -j axis

118. In a parallel RL circuit, the phase angle between the inductor I and applied voltage V is

a. 90

b. 30

c. 15

d. 0

119. The power dissipation in an RC circuit is due to

a. Resistor

b. Capacitor

c. Both resistor and capacitor

d. Either resistor or capacitor

120. Maximum power transfer theorem takes place in complex impedance circuit (source impedance is complex) only when

a. Load impedance is equal to source impedance

b. Load impedance is greater than source impedance

c. Load impedance is less than source impedance

d. Load impedance is complex conjugate of source impedance

121. The final value theorem is used to find

a. The initial value of he system output

b. The steady state value of the system output

c. The transient behavior of the system output

d. None

122. Laplace transform analysis provides

a. Time domain response

b. Frequency domain response

c. Both time and frequency responses

d. Either time or frequency response

123. The condition for a two-port network to be reciprocal is

a. Z11=Z22

b. Y21=Y22

c. H21=H12

d. H21=-H12

124. If A=<120 data-blogger-escaped-a="" data-blogger-escaped-and="" data-blogger-escaped-b="5<10" data-blogger-escaped-br="" data-blogger-escaped-is="" data-blogger-escaped-then=""> a. 20 &lt;+12
b. 20 &lt; -12
c. 20 <-110 data-blogger-escaped-br=""> d. 20<-110 data-blogger-escaped-br=""> 125. In a series resonance circuit (RLC)
a. Maximum voltage occurs across the capacitor and inductor below the resonant frequency
b. Maximum voltage occurs across the capacitor and for inductor above resonant frequency
c. Maximum voltage occurs across the capacitor below the resonant frequency and for inductor above the resonant frequency
d. Maximum voltage occurs the capacitor above the resonant frequency and for inductor below the resonant frequency
126. Narrow bandwidth of an RLC circuit has
a. No effect on selectivity
b. Greater selectivity
c. Les selectivity
d. Poorer selectivity
127. Transient behavior occurs in any circuit when
a. Voltage source is shortened
b. Circuit is disconnected from the supply
c. Circuit is connected to the supply
d. All
128. Electricity is measured in
a. Mho/m
b. Mho
c. Mho/m*m
d. Mho/m*m*m
129. Which one of the following is incorrect with respect to watts?
a. Amperes/volt
b. Amperes*volt
c. Amperes*amperes
d. Joules per second
130. The power factor of a particular inductor is found to be
a. Unity
b. Zero
c. Lagging
d. Leading
131. Capacitive reactance increases with the increase in
a. Frequency
b. Voltage
c. Current
d. None
132. A cut set has
a. Only one tree link
b. Only one tree branch
c. Two or more tree links
d. Two or more tree branches
133. Parallel tunes circuit will be inductive
a. Exactly at resonant frequency
b. Above resonant frequency
c. Below resonant frequency
d. At a wide range of frequencies
134. A network having one or more than one emf sources is called as
a. Passive network
b. Active network
c. Linear network
d. Non-linear network
135. A capacitor is
i. Unilateral component
ii. Bilateral component
iii. Active component
iv. Passive component
Which one of the following is correct
a.i only
b. ii &amp; iv 
c. i&amp;iv
d. i&amp;iii
136. a capacitor with no initial charge at =0 acts as
a. open circuit
b. closed circuit
c. constant voltage source
d. constant current source
137. The superposition theorem is applicable to
a. Current
b. Voltage
c. Power
d. All
138. Which one of the following theorems is applicable for both linear and non-linear circuits?
a. Superposition
b. Thevenin’s
c. Norton’s
d. None
139. The power factor of an ac circuit lies between 
a. 0 and 1
b. -1 and 1
c. 0 and -1
d. 1 and 5
140. At resonance a series R-L-C circuit has
a. Minimum current flow
b. Maximum impedance
c. Minimum admittance
d. Maximum admittance
141. Kirchoff’s laws are valid for
a. Linear circuits only
b. Non-linear circuits only
c. Both linear and non-linear circuits
d. Passive time invariant circuits
142. The power in a single phase ac circuit is given by
a. VI
b. VI sinώt
c. Vώ cosώt
d. I*I Z
143. By adding more resistance to an R-C series circuit 
a. The true power increases
b. The power factor increases
c. The reactive power decreases
d. All
144. In a series resonant circuit, the line current is
a. Zero
b. Infinite
c. Maximum
d. Minimum
145. The power dissipated at the half power point is ------ power dissipated at resonance.
a. The same as
b. Half of
c. 1/√2 times of
d. √2 times of
146. Resonance frequency of a series R-L-C circuit is related to half power frequencies f1 and f2 as
a. F=f1+f2/2
b. F=√f1f2
c. F=f2-f1
D. F=(√f1 + √f2)^2