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design an Armstrong indirect FM modulator to generate an FM carrier with a carrier frequency of 96 MHz and Df= 20 kHz. A narrow-band FM generatorwith fc = 200 kHz and adjustable Df in the rangeof 9
A mini-mart has just installed a bar codereader to improve efficiency at their checkouts. Assume that the bar code is to access a filethat store the product descriptions, unit price and quantity of
The current is the flow of electrons through conductor ,and voltage is the force that exerted on electrons to flow through the conductor, then why in many electric circuit the voltage is very high wh
Design a full-wave rectifier to provide a dc output of 28V at a current of 4A, with a ripple of not more than 3%. A linevoltage of 120V (rms), 60Hz is available.
A 3-phase cage rotor induction motor has a full load slip at 5% . The standstill current at rated voltage is 6.5 times full load current . Find autotransformer tapping to give full load torque at st
design and isolate your circuit by use of transformer at the input, Select suitable and standard diodes in your design , Inyour design assume a 1V peak ripple across the filleting capacitor.After th
Using energy concepts, find the internal self inductance per unitlength of a loss-less, conductive solid wire of radius ρ. You may assume that the current is uniformlydistributed through the cr
A coaxial transmission line consists of two concentric cylinders.The inner cylinder has radius r1 and the outer cylinder has radius r2. The inner cylinder has a surfacecharge density ρS C.m-2, t
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 mo
An auto transformer is used to reduce the starting current and to give full load torque at starting .Neglecting no load current , determine : (a) Voltage applied at starting , (b) Full load line cu
A 3-phase squirrel cage motor has maximum torque equal to twicefull load torque. r2 =0.3 ohms and x2 =3ohms. Determine the ratio of starting torque to full loadtorque, if it is started by (a) Direct
A 12 KW, 50 Hz 3-phase induction motor developes rated torque at 1450 r.p.m. in case load torque is reduced to half , find the motor speed and the power output. Assume linear torque -slip characters
A 3-phase induction motor, the equivalent rotor stand still reactance is equal to the reactance, while each resistance is (1/3)rd of this value. A torque of 500 Nmis developed at a slip of 5%. Calcu
The ratio of stator to rotor turn is 1.8. The full load slip is 2%. Calculate for this load the torque developed torque and the horse power . Find also the maximum torque and the speed at maximum to
An 1100 V. 50 Hz star connected induction motor has a starconnected slip-rings rotor with a transformation ratio of 3.0. Therotor resistance per phase is 0.015 ohm and leakage inductance is0.8 mH pe
A 6-pole, 50 Hz., 3-phase induction motor running on fullload develops a useful torque of 175 Nm when the rotor e.m.f. makes 120 complete cycles per minute . Calculate the shaft power output,If the
An 8-pole, 3-phase alternator is coupled to a prime mover running at 750 r.p.m. It supplies an induction motor, which has a full load speed of 950 r.p.m. Find the number of poles.
Calculate for this load (a) the slip (b) The stator copper loss (c) The total power input if the stator losses are 2000 W, (d) The efficiency (e) The line current (f) The number of complete cycles
An induction motor has an efficiency of 0.80 when the load is 50 h.p. At this load , both stator copper loss and rotor copper loss are equal to the core losses . The mechanical losses are one -four
A circuit consisting of a coil with inductance 10mH andresistance 20ohms is connected in series with a capacitor and a generator with an rms voltage of 120V. Find: a.)the value of the capacitance th
Find the magnetic field intensity using the concept of vector magnetic potential for plane z = 0 carrying uniform current K =Ky ayz.
The fermi level for the conductor is 5.6e.V. There are 5.8x1028 free electrons /m3. Find the (a) mobility and relaxation time of electrons ,(b)Average drift velocity of the electrons when the applie
Discuss which display technologies would be most appropriate for viewing DVD movies in the following situations. (i) A home entertainment system in a living room (ii) A personal seat-mounted display o
Determine the time of operation of a 5 amp. , 3 sec. over current relay having a current setting of 150 percent and a time setting multiplier of 0.8 connected to supply circuit through a 500 /5 c
Discuss the different possible conditions under which the fault develops in power system . What are possible causes offaults in transformers ,alternator and transmission lines what are possible rem