Skip to content
Electronics –
High Difficulty
ARE YOU READY?
LET’S PRACTICE!
#1. The frequency of a Wien bridge oscillator with R = 10 kΩ and C = 10 nF is:
#2. Phase margin of an amplifier should be at least _____ for stability:
#3. An antilog (exponential) amplifier uses:
#4. A boost converter with Vin = 12V and D = 0.4 produces Vout of:
#5. An op-amp has open-loop gain of 100,000 and GBW of 1 MHz. The -3dB bandwidth in open-loop is:
#6. A phase-shift oscillator using RC sections requires minimum _____ stages:
#7. A MOSFET has kn = 1 mA/V², VTH = 2V, and is biased at VGS = 4V. In saturation, ID equals:
#8. A charge pump voltage doubler with 5V input and ideal diodes produces:
#9. An op-amp has input offset voltage of 5 mV. In non-inverting configuration with gain 100, output offset is:
#10. The input bias current of a FET-input op-amp is typically:
#11. A CS amplifier with RD = 5 kΩ and gm = 4 mS has voltage gain magnitude of:
#12. An instrumentation amplifier with Rg = 1 kΩ has gain set by G = 1 + 50k/Rg. The gain is:
#13. A low-dropout regulator (LDO) has minimum dropout voltage of 0.3V. With input 3.6V, maximum output is:
#14. A track-and-hold vs sample-and-hold difference is:
#15. A differential amplifier has Ad = 1000 and Acm = 0.05. The CMRR in dB is:
#16. Rail-to-rail input op-amp means:
#17. A synchronous buck converter compared to diode buck has:
#18. Compensation in op-amp circuits is used to:
#19. An isolation amplifier provides:
#20. A pipeline ADC achieves high speed by:
#21. A Class D amplifier has theoretical efficiency of:
#22. A chopper-stabilized op-amp is used for:
#23. A linear regulator dissipates power equal to:
#24. A crystal oscillator has typical frequency stability of:
#25. A charge-pump PLL has advantage of:
#26. A switched-capacitor resistor equivalent with C = 10 pF and clock frequency 100 kHz has equivalent R of:
#27. A full-wave rectifier with 120V RMS input and 1000µF filter capacitor at 1A load has ripple voltage approximately:
#28. A phase-controlled rectifier fires SCR at α = 60°. For resistive load with Vm = 170V, average DC output is:
#29. A resonant converter operates switches at:
#30. The 555 timer in astable mode with RA = 10 kΩ, RB = 20 kΩ, C = 0.1 µF has frequency approximately:
#31. A 12-bit DAC with 10V reference has resolution of:
#32. A flyback converter with Np/Ns = 3 and D = 0.4 has Vout/Vin ratio of:
#33. A relaxation oscillator using op-amp and RC produces:
#34. The output stage of most op-amps is:
#35. The THD of a square wave inverter output is approximately:
#36. The gain-bandwidth tradeoff in op-amp circuits means:
#37. In a sample-and-hold circuit, droop rate is caused by:
#38. A bandgap voltage reference produces output of approximately:
#39. A GaN FET compared to silicon MOSFET offers:
#40. A BJT amplifier has IC = 2 mA, β = 150, and RC = 5 kΩ. The voltage gain magnitude with RE bypassed is approximately:
#41. An anti-aliasing filter for 100 kHz ADC sampling rate should have cutoff:
#42. A transimpedance amplifier converts:
#43. The Barkhausen criterion for oscillation requires:
#44. The effective resolution of a sigma-delta ADC increases by _____ bits per doubling of oversampling ratio:
#45. The aperture jitter of an ADC limits:
#46. For the MOSFET above, the transconductance gm is:
#47. An IGBT combines properties of:
#48. An inverting amplifier with gain -100 using op-amp with GBW = 1 MHz has bandwidth:
#49. A non-inverting amplifier has Rf = 99 kΩ, R1 = 1 kΩ, with op-amp having Aol = 10^5. The actual closed-loop gain is:
#50. For a buck converter operating at 200 kHz with L = 100 µH and Iout = 2 A, the ripple current is (Vin=24V, Vout=12V):
#51. A sigma-delta ADC achieves high resolution through:
#52. A Hartley oscillator uses:
#53. A second-order Butterworth low-pass active filter has Q = 0.707. The peaking in frequency response is:
#54. The minimum inductance for continuous conduction mode (CCM) in buck converter is proportional to:
#55. A Colpitts oscillator uses:
#56. In a three-phase inverter, the fundamental output voltage (line-to-line) with DC bus Vdc using six-step is:
#57. The common-mode voltage range of an op-amp limits:
#58. An op-amp integrator with R = 10 kΩ and C = 0.1 µF has unity gain frequency of:
#59. A Wien bridge oscillator requires amplifier gain for oscillation of:
#60. A current mirror using matched BJTs has output current accuracy limited by:
#61. A Wilson current mirror improves upon simple mirror by:
#62. Space vector PWM compared to sinusoidal PWM provides:
#63. A power factor correction (PFC) boost converter operates at:
#64. A buck converter with Vin = 24V and duty cycle D = 0.5 produces Vout of:
#65. A differential-to-single-ended conversion can be done with:
#66. The lock range of a PLL is:
#67. An SCR with holding current Ih = 5 mA is connected to a 100Ω load. Minimum voltage to maintain conduction is:
#68. The temperature coefficient of an ideal bandgap reference is:
#69. A logarithmic amplifier output is proportional to:
#70. A BJT has IC=2mA and VT=26mV. The small-signal transconductance gm is:
#71. For an op-amp integrator with R=10kΩ and C=1μF, the gain at 1kHz is:
#72. A class AB amplifier achieves efficiency up to approximately:
#73. The slew rate of an op-amp with 10V output swing and 1μs rise time is:
#74. A MOSFET in saturation has drain current given by:
#75. The Miller effect in amplifiers:
#76. A Colpitts oscillator uses feedback from:
#77. For a half-wave rectifier with Vm=100V peak, the DC output is approximately:
#78. The input bias current of an op-amp causes:
#79. A Darlington pair has current gain approximately:
#80. In a CMOS inverter, both transistors are ON:
#81. The thermal voltage VT at 300K is approximately:
#82. A phase-locked loop (PLL) consists of:
#83. The ripple factor of a full-wave rectifier with capacitor filter is:
#84. A schmitt trigger has:
#85. The break frequency of a BJT CE amplifier is limited by:
#86. For maximum efficiency in class A amplifier, the theoretical limit is:
#87. A current mirror with mismatched transistors produces:
#88. The voltage gain of an emitter follower is:
#89. Thermal runaway in BJT is prevented by:
#90. The duty cycle D of a buck converter with Vin=24V and Vout=12V is:
#91. Crossover distortion occurs in:
#92. The input offset voltage of an op-amp appears at output multiplied by:
#93. A sample-and-hold circuit uses:
#94. The figure of merit for a voltage regulator includes:
#95. IGBT combines advantages of:
#96. The bandwidth of a transimpedance amplifier is limited by:
#97. A logarithmic amplifier uses diode/transistor because:
#98. PWM inverter output contains harmonics at:
#99. The noise figure of a cascaded system depends most on:
#100. A voltage-controlled oscillator (VCO) converts:
