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Question 1) A shunt machine has armature and field resistance of 0.04 ohm and 100 ohm respectively. When connected to a 460 V d.c. supply and driven as a generator at 600 rev/min, it delivers 50 kW. Calculate its speed when running as a motor and taking 50 kW from the same supply.
Question 2) A shunt motor, connected across a 440 V supply, takes an armature current of 20 A and runs at 500 r/min. The armature circuit has a resistance of 0.6 ohms. If the magnetic flux is reduced by 30 % and the torque developed by the armature increases by 40% , determine the value of armature current, and speed.
A 50 Hz, 440 V, 3-phase , 4-pole induction motor develops half the rated torque at 1490 r.p.m. with the applied voltage magnitude remaining at the rated value, what should be its frequency if the motor has to develop the same torque at 1550 r.p.m.
A duplex receptacle with one receptacle outlet always hot and the other outlet switched from two switch locations. The receptacle has two controlled outlets, must be powered through a switch control (SPDT), include all phase, neutral and grounding..
For a conductive metal the Fermi energy was determined to be 7.01eV at 300K. a)What is the probability of an electron occupying the energy level of 7.15eV b)What would the probability become if the temperature rises to 757°C
Design a multiplier based on the flowing pseudo algorithm where the multiplicand is A and the multiplier is B. P=0 : for i = 0 to n - 1 do if b(i) =1 then P=P+A ; end if; Left-shift A ; end for; a) design the complete datapath (architecture) of the..
A 3 phase, 60 Hz, 4 pole, 440-v (line-line, rms) induction motor drive has a full-load (rated) speed of 1746 rpm. The rated torque is 40Nm. Keeping the air gap flux-density peak constant at its rated value
Heat is added until the final volume is twice the initial volume. Assume that Helium behaves as an ideal gas. Use the table provided to determine the specific heats of helium and determine the following. Find the temperature at the final state.
What are the names of the three regions of the bipolar junction transistor Why is there a thin region of one material type "sandwiched" between two layers of the opposite material type
simultaneous pumping into both the upper and the lower laser levels. consider a laser transition between two upper
Hspice Netlist example, Often Netlist is generated by programs such as Cadence. However, on the rare occasions when one has to look at Hspice netlist
A person with a receiver is 5 km away from the transmitter .What is the distance that this person must move further to detect a 3dB decrease in signal strength.
Holliman Veterinary Hospital has considered advertising on the radio and in newspapers in their community, but now has contacted you about the possibility of developing a better Web presence. HVH is located in an area of about a half million people; ..
Determine the I/O difference equation relating the input x(n) and the output y(n) for the following LTI systems with the impulse response: h(n)=(0.4)u(n)+(-0.4)^n u(n), where u(n) is the unit step sample signal
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