Electrical Engineering Answers

If a car agency sells 50% of its inventory of a certain foreign equipped cars with air bags. Find out Probability mass function (P.M.F) & cumulative distribution function (C.D.F) of the next 4 cars to be sold

How can we calculate the internal resistance of a wheatstone brigde given that Resistance 1=Resistance 2=Resistance 3=Resistance 4=1000 ohms and a galvanometer can detect as low as 0.1 milliamperes?

 A 220V, 50 Hz, 6 pole, Y connected alternator with resistance 0.06 Ω per phase gave

the following data for open circuit and Short circuit characteristics.

An educational institution wish to maintain a database of its students, the database is divided into a members of classes whose multiple relationships are shown in fig.1,find:

a-Initialize the five data members by using constructor? b-Calculate average of two marks (using friend function)? c-Display all database information where the student is successful?

Consider the LTI system

𝑦 𝑛 = 𝑥 𝑛 + 1 + 2𝑥 𝑛 + 𝑥 𝑛 − 1 − 𝑥 𝑛 − 2

What would be the response for the input as shown in figure

A Zener diode regulator circuit

must

provide a constant voltage of 12V, across

a 250Ω load resistor. The circuit uses a 24V input DC source, a 12V Zener

diode and a 50Ω series resistance. Calculate the minimum acceptable power

rating of the Zener diode.

a)

Transistors of a certain type are specified to have β values in the range 50

to 150. Find the range of their α values.

b)

Measurement of

a

npn BJT in a particular circuit shows the base current to

be 14.46 μA, the emitter current to be 1.460 mA, an

d the base

–

emitter voltage

to be 0.7 V. For these conditions, calculate α, β, and

𝐼

𝑆

.

c)

Consider

a

npn transistor with

𝑉

𝐵𝐸

= 0.7 V at

𝐼

𝐶

= 1 mA. Find

𝑉

𝐵𝐸

at

𝐼

𝐶

=

0.1 mA

.

Graphically represent the following two signals.  f₁(t) = 3δ(k) + 2δ(k-1) + δ(k-2), f₂(t) = ε(t-1) - ε(t-2)

What is the unit sequence response?

 Graphically represent the following two signals. 

( ) 3 ( ) 2 ( 1) ( 2) f1 t   k   k    k  , ( ) ( 1) ( 2)