systems. (2) 3. An electric train has a schedule speed of 25 kmph between stations 800 m apart. The duration of stop is 20 seconds, the maximum speed is 20 percent higher than the average running speed and the braking retardation is 3 kmphps. Calculate the rate of acceleration required to operate this service. Diel (2)

B) A 60-Hz generator is supplying 60% of P max to an infinite bus through a reactive network. A fault occurs which increases the reactance of the network between the generator internal voltage and the infinite bus by 400%. When the fault is cleared, the maximum power that can be delivered is 80% of the original maximum value. Determine the critical clearing angle for the condition described.

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Consider the radial power system shown below. Assume that the generator is ideal, with a terminal voltage of 1.0 pu. The system data are given in the accompanying table. The bolted line-to-line fault currents flowing in circuit breaker B2 for faults at buses 2 and 3 are equal to: From To Positive sequence 2 3 5 B₁ Select one: a. OA, 9.53A O b. 1A, 9.53A ○ C. 1A, 4.53A O d. 0A, 4.53A impedance B₂ B₂ BA 1 2 0.01+j0.05 2 3 0.003+j0.04 3 4 0.008+j0.04 4 5 0.01 +0.05

Below figure shows a single line diagram of a portion of a radial distribution system. The PS of Relay 3 (R3) is 75% of CT Secondary and time setting multiplier is given 0.1. The CT ratio is given with each relay and fault current of each in bus bar is given in figure. PS for R1 and R2 is set at 100%. Determine the operating time of each relay. Consider 0.25 sec for time coordination time interval. R30.297 R2 = .475 R1 = .654 A B C ID 1000/1 R₁ 10,000 A 800/1 800/1 M R₂ R₁ 8000 A 6000 A 5000 A

Intermittent wiper delay interval on late models vehicles is controlled by the BCM.  True or False

Consider the following discharge diagram for the next three questions. VOLTS 1.4- 1.3. 12. 1.1. 1.0- 0.9- (2.) 7. Curve (1.) represents the (a) ideal (b) steady state (c) actual (real) (d) operational (e) None of the choices are correct (1₁) 8. Curve (2.) represents the (a) steady state (b) transient (c) actual (real) (d) ideal (e) None of the choices are correct TIME 6. The discharge curves shown are typical of which components? (a) Capacitors (b) Inductors (c) Batteries (d) Low-Pass filters (e) Notch Filters Stop Operating Discharged _discharge behavior of the component in Question 6. discharge behavior of the component in Question 6.

The following test results are obtained for a 3ph, 25 kV, 750MVA, 50 Hz, 3600rpm, star-connected synchronous machines at rated speed. 4 (A) Vu (kV) open-circuit test 1, (A) short-circuit test Vu (kV) air gap line 1500 25 10,000 30 i Determine the unsaturated and saturated values of the synchronous reactance in ohms and pu. If a short-circuit test is performed at constant field current 1500 A but at different speeds; 1000, 2000, 3000 and 3600 rpm. ii Determine the short-circuit current at these speeds above. i. Determine the fieldcurrent if the synchronous machine delivers rated MVA to an infinite bus at0.9 lagging power factor.

Design a ladder program to run the material mixing system according to the following information: 1- When the start push button I0.0 is pressed, the pump (PUMP1 Q0.0) works for five seconds and then stops. 2- After that, the pump (PUMP2 Q0.1) runs for three seconds and then stops. 3- After that the pump (Mixer Motor Q0.2) works for 60 sec and then stops. 4- After that, the control valve (drian valve Q0.3) is opened, the pump (PUMP3 Q0.4) works for ten seconds. 5- The stop push button I0.1 is used to stop the system.

A generator operating at 50 Hz delivers 1 pu power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place. reducing the maximum power transferable to 0.5 pu whereas before the fault, this power was 2.0 pu and after the clearance of the fault, it is 1.5 pu. By the use of equal area criterion, determine the critical clearing angle.