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- A diesel engine has a compression ratio of 18 and cut- off takes place at 5% the stroke . calculate the air standard efficiency. Y=1.4
For the circuit shown in Fig.6, Impedance A receives 2kW at 0.8 power factor impedance receives 3kVA at 0.4 power factorleading, while impedance C is inductive and consumes 1kW and receives 500VAR. (i) Find the power factor of the entire system, (ii) Find the current I, if VVs=120/_45`v..
The circuit shown in Fig.5 is applied with a 240 V, 50 Hz supply. Find thevalues of R and C so thatVb=3Va and Vb and Va are in phase quadrature
i. Two or more resistors in a circuit are said to be in parallel when all the resistors are connected to the same nodes and the same voltage is appearing across all these elements. Two or more resistors in a circuit are also said to be in series when the current flowing through all the resistors is the same. With the aid of three resistors, Ohm’s law and diagrams derive the two important total resistance formulas for the two connections to verify these two postulates
As a student of Electrical Circuit Analysis at Accra Institute of Technology (AIT), you have been tasked to analyze a linear active, bilateral two terminal network to be implemented at SEAVIEW campus containing impedance and voltage source using Thevenin’s theorem. Demonstrate with diagrams and derived formulas including that for the load current to analyze the circuit.
i. In your own words explain why current is transmitted over long distance as alternating current (ac) and not as direct current (dc)
ii. Compare and contrast a direct current circuit and an alternating current circuit using graphs.
iii. Using your knowledge of the concept of expressing sinusoids in terms of phasors in alternating current (ac) demonstrate how you will obtain the voltages v and V, the phasor current I and sketch phasor diagram if a circuit has a series combination of R=40Ω and L=80 mH and has a current
i=2.0 Cos(500t+10o) (A)
The summer you have designed has four input lines with R1=1, R2=1/2, R3=1/4, R4=1/8and Rf=1, all values given in kΩ. The input lines are set at 0 or 1v. Find V0 in terms of the following set of input values V4=1, V3=0, V2=0 and V1=1
i. A computer manufacturing company has approached you to assist it to design a summer circuit for its new type of computers. You are provided with resistors R1, R2, R3, R4 and a feedback resistor Rf. Design and draw the summer circuit
ii. Derive the formula for the output voltage Vo of the summer
A series R L circuit is connected to a 110V ac source. If the voltage across the resistor is 85 V, find the power dissipated in the circuit
. Find the impedance of the circuit if supply voltage is v(t)= 110sin(20t+30 ) +220 cos(20t- 90 )V and the current i(t) =30cos(20t +60 ) -20sin(20t+ 60 )A
