This set of Electronic Devices and Circuits written test Questions & Answers focuses on “Oscillators – 2”. 1. For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________ a) 19 b) 30 c) 29 d) 1 2. What is the minimum frequency at which a crystal will oscillate? a) fundamental … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Oscillators – 1”. 1. What are oscillators? a) Switching circuits b) Converts dc to ac c) Converts ac to dc d) Filter circuits 2. Give the relation between output and input voltage of an oscillator? a) Av = Vi/Vo b) … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class D Amplifiers”. 1. Why a class D amplifier is called as switching amplifier? a) Because it consists of a transistor b) Because of high power c) Because of less noise effect d) Because of binary switch 2. For an … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class B Amplifiers”. 1. Where does the Q point lie for class B amplifier? a) Active b) Cut off c) Saturation d) Between saturation and active 2. Class B amplifier Produces output even if the input is zero. a) True … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Transistor Case and Heat Sinks”. 1. Why does the heat sink has fins? a) to provide cooling to the processor b) to provide airflow to the radiator c) to preserve the energy d) to provide radiator to the airflow 2. … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Power BJTs”. 1. A power transistor is a ____________ a) three layer, three junction device b) three layer, two junction device c) two layer, one junction device d) four layer, three junction device 2. For a power transistor, if base … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class B Output Stage”. 1. The maximum collector efficiency of class B operation is ________ a) 50% b) 25% c) 30% d) 5% 2. A 2-transistor class B power amplifier is commonly called ________ amplifier a) Dual b) Single ended … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class A Output Stage”. 1. A class A power amplifier uses ______________ a) Two transistors b) One transistor c) Three transistors d) Four transistors 2. The maximum efficiency of resistance loaded class A power amplifier is ____________ a) 5% b) … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Output Stages”. 1. A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat). a) 4.4mA b) 6.1mA c) 20mA d) 16.7mA 2. Which of the power … Read more
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Transconductance Amplifiers”. 1. A transconductance amplifier is also called ___________ a) current to voltage convertor b) voltage to current convertor c) resistor d) inductor 2. The transconductance of a JFET ranges from ____________ a) 100 to 500 mA/V b) 500 … Read more
