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(a) State two disadvantages of Time Graded Protection systems
(b) What is the preferred secondary current rating of a CT for a Differential Protection System? why is this rating preferred?
(c) State the minimum time grading interval between two relays and give reasons for this interval
(d) State the two rules of successful time grading relays
A saw, fan, and lube pump all go on when a start button is pressed. Pressing a stop button immediately stops the saw but allows the fan to continue operating. The fan is to run for an additional 5 seconds after shutdown of the saw.
For the vector field E = 5exp(-2r)rˆ - 3rzˆ calculate the divergence in cylindrical coordinates. Verify the divergence theorem for the cylindrical region enclosed by r=2, z=0 to 4.
Sometimes the partial fraction expansion is not neede in finding the inverse Z-transform -instead the properties of the transform can be used. Consider the function F(z)= (z+1)/z^2*(z-1)
Draw a circuit that operates as follows- When power is applied to the circuit and before any push buttons are pressed all relays are de-energised and lamps extinguished.
It is commonly found that if a capacitor is changed to some dcvoltage and then removed from the circuit and is totally dischargedwith a "short" placed across it when the short is removed thecapacitor will slowly begin to "aquire" a small voltage.
An IPv4 datagram has arrived with the following information in the header (in hexadecimal): Ox45 00 00 54 00 03 58 50 20 06 00 00 7C 4E 03 02 B4 OE OF 02 a. Is the packet corrupted b. Are there any options
A 100μF capacitance is initially charged to 1000 V. At t1=0, it is connected to a 1kΩ resistance. At what time t2 has 50 percent of the initial energy stored in the capacitance been dissipated in the resistance
Typically, a speech signal that can be understood over a telephone shows frequencies from about 100 Hz to about 5 KHz. What would the sampling frequency fs (samples/ sec) that would be used to sample a speech without aliasing
A small house has three windows and two doors. Each window and door has a switch attached such that the contacts close when a door or window opens. Draw a ladder logic diagram that will turn on a light if one or more windows are open or if both do..
Two amplifiers(CS) connected in cascade. The input voltage to the first stage has a source voltage Vsig and Rsig= 100KOhm. Rv=10KOhm AND IS CONNECTED TO THE DRAIN OF THE SECOND STAGE. BOTH TRANSISTORS HAVE Id=.25mA and Vov=.25V
A jet has 4 engines, A and B on the left wing, C and D on the right wing. Each engine gives a FAIL signal which is TRUE if the engine is broken, and is FALSE if the engine is working fine. The plane can fly as long as at most 1 engine on each wing..
Use Routh- Hurwitz method to determine if the system is stable or unstable. If it is unstable how many poles are in the right half of the s-plane (s^2+2s-5)/(s^3+2s^2-8s+6)
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