Related InterviewSolutions

• The total thermal resistance of a power transistor and heat sink is 20°C/W. The ambient temperature is 25°C and (TJ)MAX=200°C. If VCE=4V, find the maximum collector current that the transistor can carry without destruction.(a) 3.67A(b) 7.56A(c) 2.19A(d) 4.16AI have been asked this question by my college professor while I was bunking the class.Asked question is from Thermal Stability in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• Thermal runaway is_________(a) an uncontrolled positive feedback(b) a controlled positive feedback(c) an uncontrolled negative feedback(d) a controlled negative feedbackI had been asked this question in an interview for job.My doubt stems from Thermal Runaway topic in section Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• What is the Thevenin’s resistance (RTH) in a self bias shown below?(a) R1R2/R1+R2(b) R2/R1+R2(c) R1R2/R1-R2(d) R1/R1-R2This question was posed to me in an online interview.Query is from Self-Bias in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• The base current for a BJT remains constant at 5mA, the collector current changes from 0.2mA to 0.3 mA and beta was changed from 100 to 110, then calculate the value of S.(a) 0.01m(b) 1m(c) 100m(d) 25mI got this question in unit test.My query is from Bias Stability topic in portion Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• For a fixed bias circuit having RC=2Kohm and VCC=60V, IB=0.25mA and S=101, find Vce.(a) 12V(b) 10V(c) 5V(d) 2.5VThe question was posed to me in a job interview.The origin of the question is Bias Stability topic in section Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• For a Voltage divider circuit having RC=R1=R2=RE=1KΩ, if VCC=20V, find IC when Vce = VCC?(a) 1mA(b) 2mA(c) 20mA(d) 0I had been asked this question in my homework.This is a very interesting question from The Operating Point topic in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• For a Fixed bias circuit having RC=2.2KΩ, RB=240Ω, VCC=12v and current amplification factor is 100 and the current flowing through the base is 20µA, the value if Collector current in saturation is_____________(a) 5.4mA(b) 3mA(c) 1mA(d) 0AThe question was posed to me in semester exam.This interesting question is from The Operating Point in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• The thermal runway is avoided in a collector to base bias because_________(a) of its independence on β(b) of the positive feedback produced by the base resistor(c) of the negative feedback produced by the base resistor(d) of its dependence on βI got this question in exam.I would like to ask this question from Thermal Runaway in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• Generally, the resistance of the thermistor decreases _______(a) Exponentially with an increase in temperature(b) Linearly with an increase in temperature(c) Linearly with the decrease in temperature(d) Exponentially with the decrease in temperatureI got this question in final exam.My query is from Thermistor and Sensistor Compensation topic in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits
• The compensation technique uses __________(a) transformers(b) inductors(c) diodes(d) capacitorsThis question was addressed to me in a national level competition.The above asked question is from Thermistor and Sensistor Compensation in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits