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A three phase 12 pole, 220-V, 60- hz ,50 hp squirrel cagemotor , operating at rated load, has a speed of 595 r/min, anefficiency of 89 percent ,and a power factor of 81 percent lagging.The locked rotor current and locked rotor torque at a rated voltage and rated frequency are 725A and 120 percent rated torque,respectivtively. Determinea) rated line currentb)rated torquec) minimum voltage required to obtain a blocked- rotor torque equal 70 percent rated torqued) auto transformer bank ratio required to provide the minimumvoltage in (c)e)stator current at blocked rotor with auto transformer incircuit;f) corresponding input current to the transformer when starting the motor at the voltage in (c)
Explain Systematic Errors and Random Errors with suitable a case study for each error. Briefly comment on your answer based on your explanation.
A pressure sensor covers a range of 0-500 psi with 2.5 mV/psi. The sensor is input to an ADC with a voltage range of 0 to 5 V. What is the value of the feedback resistor required for a non-inverting amplifier circuit required to interface the sens..
The voltage drops across three resistors in series are measured to be 10.0V, 15.0V, and 25.0V. If the largest resistor is 47.0 ?, what is the value of the smallest resistor?
It is desired to know the design impedence referred to the primary and to the secondary for basic engineering calculations and analysis a. solve for the transformer impedance referred to the primary b. solve for the tranformer impedance referred to ..
A cell-phone tower has a circular coverage area of radius 10 km. If a call is initiated from a random point in the coverage area, find the probability that the call comes from within 2 km of the tower.
A superhetrodyne receiver has three stages of IF amplification, each with a bandwidth Of 13.2 KHz. It is found that two additional stages are needed for proper operation. The bandwidth when using 5 stages must be no larger than it was using three ..
After driving a portion of the route, the tap tap is fully loaded with a total of 24 people including the driver, with an average mass of 70kg per person. In addition, there are three 15kg- goats, five 3kg- chickens, and a total of 25kg of bananas..
Draw the phasor diagrams associated with under-excited and over-excited synchronous motors and show the power factor of operation associated with each.
Discuss how a shift register differs from a counter and how flip flops are used in counters and shift registers. Also discuss different applications of counters and shift registers.
Common base, emitterand collector amplifiers; differential pairs. Multistageamplifiers, cascades, cascodes. AC response of 1-stage amplifiers,Miller effect. Output stages, thermal considerations, heat sinks.Non-linear circuits: oscillator, Schmitt..
Plotting Continuous time signal, Consider the following continuous signal: x(t) = 10e^-3t u(t) Using Matlab, plot the continuous-time signal over the range -1=
A PLL frequency synthesizer has an output frequency of 470 MHz. A divide-by-10 prescaler is used. The reference frequency is 10 kHz. What is the frequency step increment
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