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The resistance of an incandescent lamp is measured as 110 ohms. The lamp is then inserted in a DC circuit and it is noticed that as the voltage increases the resistance also increases. How do you explain this apparent contradiction with Ohm's law? Why does the lamp resistance increase with voltage?
A collector modulated transmitter has a supply voltage of 48 V and an average collector current of 600 mA. What is the input power to the transmitter How much modulating signal power is needed to produce 100 percent modulation
1. The closed-loop transfer function of a system is T(s) = 11.1(s +18)/ ((s + 20)(s2 + 4s +10)) Plot the poles and zeros of this system and discuss the dominance of the complex poles. What overshoot for a step input do you expect
compute the power loss in a transmission line with a resistance of 0.05 ohms/mile. Compute the power loss if 500kW of power is transmitted from a power generating station to cities at distances of 20,30,40....100 miles at 100v and 200v.
Suppose that the number of customers entering a department store in a day is a random variable with mean of 50 customers/day. Suppose that the amounts of money spent by each one of these customers are statistically independent.
In a 50 KVA, Y connected, 440 V, 3 phase, 50 Hz alternator, the effective armature resistance is 0.25 ohms per phase. Synchronous reactance is 3.2 ohms per phase. Determine at rated load and unity power factor,
Two free particles (that is, free to move) with charges +1µC and +3µC are a distance L = 2m apart. A third charge is placed so that the entire system is in equilibrium. Find the location, magnitude, and sign of the third charge.
The bandwidth of interest is between 0.5 and 50 Hz and has peak amplitude of approximately +/-1 mV. -a. Design and draw a block diagram (not circuit) of the signal conditioning portions (everything before ADC) of your system.
A half wave dipole antenna is operating in air at a frequency of 100 MHz. At a distance of 1000 km and at an observation point ? = ?/2, electric field strength is measured to be 5 µV/m. Calculate the a. Length of the antenna
with general block diagrams, show how to obtain the following frequencies from a 10 MHz clock by using single flip-flop, modulus-5 counters, and decade counters for 5MHz 2.5MHZ 2MHz 1MHz 500kHz 250 kHz 62.5 kHz 40 kHz 10 kHz 1 kHz
An electric field E = 10z(hat) V/m exists in air (for which epsilon_r = 1) in the region defined by the equation z > 0. A dielectric medium with epsilon_r = 5 exists in the region defined by the equation z
Important information about Electrical Networks, Engine consumes 5kw of power and a reactive power of 2kvar at current of (3+j2) Amps.
write an 8051 program that would generate a 200khz, 50% duty cycle, square wave at P1.0.Use Timer 0 for the delay. Ignore the overheads cycles due to the instructions in the loop. Assume 12 MHz clock. All data must be hex.
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