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1. If the resistor Radj is adjusted to 175? what is the rotational speed of the motor at no-load conditions?
2. Assuming no armature reaction, what is the speed of the motor at full load? What is the speed regulation of the motor?
3. If the motor is operating at full load and if its variable resistance Radj is increased to 250?, what is the new speed of the motor? Compare the full-load speed of the motor with Radj = 175? to the full-load speed with Radj = 250?
Formulate the differential equation model for a motor having inductance L and rotational inertia J, and electrical resistance Rw and frictional resistance Rf, driving a frictional load, Rl.
find the force between a charged circular loop of radius b and uniform charge density P l and a point charge Q located on the loop axis at a distance h from the plane of the loop. What is the force when h>>b, and when h=0
assume single pulse of ampltude (+1) transmitted through a band-limited noise free channel.The sampled output of the reciever filter is y y= [0.32 0.98 0.25] Determine a three-tap adaptive linear equalizer when the recieved power is 0.15W.
You are designing a PCS base station that operates at 1800 MHz. The receiver is co-located on a tower with UHF police and business radio systems that operate at 450 MHz. Since the the 4th harmonic from the UHF system is directly in the PCS band
the highest frequency for a message signal is 15 Hz. it AMmodulates a carrier of 500 kHz. Plot the frequency spectrum of the modulated signal. is the highest frequency component of the modulated signal just 15+500000 Hz
Assume that all numbers are signed binaryintegers. The final quotient must be an 8-bit number stored in the AL register, and all registers other than AX (that is, AH and AL) should hold the same contents at the end of the sequence
A residential four-wire system supplies power at 220V rms to the following single-phase appliances: On the first phase, there are ten 75-W bulbs. On the second phase, there is a 750-W vacuum cleaner with a power factor of 0.87.
A permanent magnet commutator motor produces a torque of8 N. m with armature current = 10A. armature R=.16 ohms. if motordrives a load requiring torque of 20 N. m at speed = 1800rpm
A 2.19 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 120 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s
A 2N3904 has a power dissipation of 625mW without a heat sink. If the ambient temperature is 65 degree C, what happens to the power rating
Measurements show that for a particular arrangement of the equipment and at a particular amplifier setting, the system will howl if 1% of the output power is fed back to the microphone. Estimate the power gain of the P.A. amplifier in decibels.
Three identical impedances of (12+j15)ohms are connected in wye to a 550V balanced three phase source. Determine, (a)the magnitude of the line currents. (b) the total power dissipated for the three phases. (c)the total reactive power. (d)the power..
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