Electrical Engineering Answers

Let VPS =8V and VT=0.7V ,Assuming rf=0. calculate the value of R such that ID=1.20mA, if Vps is reduced to 4v and ohms is charged to 3.5k. determine the power dissipated in the diode

A silicon pn-junction at T= 300k has a reverse-saturation current of IS=10^16A determine the forward bias diode current for VD=0.55V

1.Asilicon pn-junction at T= 300K is doped at Nd =10^16 and Na=10^17. the junction capacitance is to be cj=0.8pf. when a reverse bias voltage of VR=5v is applied . find the zero-biased junction.

A piezoresistive accelerometer has the following properties and inputs:


Axial acceleration = 100 g’s


Maximum linearity error = 1%


Sensitivity = 0.5 mV/g


What is the maximum reading of the axial acceleration in mV that the accelerometer may measure? (Type in a one-decimal number)

A d.c. motor has the following spec: k×flux= 6.0v.s Vt= 10:0 V Ra= 1.5:00 Ia= 4:0 A (armature current at full load). Calc rated torque, starting torque; starting current at full voltage, starting speed; For Seperately excited and Shunt motor?

Suppose there is a FM radio receiver, where the whole system is heated up with time due to faulty circuit components.

i) What are the changes may occur in the system due to the changes in temperature? Explain.

ii) Draw and explain the effects on skewness and kurtosis in Gaussian distribution of thermal noise when there are changes in temperature in the FM radio receiver system.

An accelerometer is measuring a structure as described below:


Damping ratio of accelerometer = 0.65


Highest frequency measured by the accelerometer = 6000 hz


Natural frequency of the accelerometer = 18000 hz


What is the percentage error in the accelerometer at the highest frequency it can measure? (Type in a two-decimal number that represents a percentage)

A delay difference of ‘x’ns between the slowest and fastest fiber with a core refractive index of 1.5 and refractive index difference of 2%. Estimate the following

The length of the optical fiber link

RMS pulse broadening due to intermodal dispersion link

Bandwidth –length product for the maximum bit rate.

A delay difference of ‘x’ns between the slowest and fastest fiber with a core refractive index of 1.5 and refractive index difference of 2%. Estimate the following

The length of the optical fiber link

RMS pulse broadening due to intermodal dispersion link

Bandwidth –length product for the maximum bit rate.

I have a circuit with two resistors in series then three following in parallel after that, r1 is 100 ohms r2 is 270 ohms, the resistors in parallel are 1000 ohms 1200 ohms and 2700 ohms, the supply voltage is 12v


i must calculate :

the supply current

the voltage dropped across each resistor

the current flowing through each of the parallel resistors