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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
A single phase full bridge inverter feds power at 50Hz to RLC load with r=5 ohms , l=0.3H and C=50μF. The dc input voltage is 220volts. (a) Find an expression for load current up to fifth harmo
A single phase cyclo converter with mid point configuration is used for obtaining an output frequency of 1/3 times the input frequeny.Turns ratio from primary to upper seconday is 1/1 and to lower s
Consider a balanced three-phase system where the sources areconnected in a wye formation and the load is connected in a wyeformation with impedance ZPY for each phase. The"a" phase source voltage i
Discuss how delay is generated (1) using only one register, and (2) using a pair of registers . explain the method to calculate the delay time. Describe the interface connections of a 7 -segment di
Discuss the properties and practical applications of the following electrical engineering materials : (a)Carbon and graphite (b) copper
Draw the circuit and discuss the operation of SA type ADC. Determine the conversion time of an SA-ADC for 12-bit resolution,at 2.5 MHz.
a Three phase to single phase converter employs a 6 pulse bridge circuit. This device is fed from 400V,50 Hz supply through adelta/stare transformer whose per phase turns ratio 3:1. For an output fr
A temperature transmitter has an input range of 0 to 100 degrees celsius, an output range of 4 to 20 mA, and anaccuracy of ± 0.5%. The ideal transmitter has a linear output from 4 mA at 0 deg
Draw the gate-level logic circuit for a one-bit selectable adder subtractor circuit using only two-input XOR, two-input NAND,and NOT gates. (Hint: The XOR gate may be used as a programmable inverter
The load reactance is 4 Ω. Thecommutation overlape and thyrister turn - off time limitthe firing angle in the inverter mode to 1650. Compute(a) peak value of r.m.s. output voltage (b) r.m.s.ou
A single phase cyclo - converter with mid point configuration is use for obtaining an output frequency of one third times the inputfrequency. Turn ratio from primary to upper secondary is 1/1 and to
The local building regulations prohibits construction of buildings higher than 25 m. Determine if it is possible to mount the antennas right at the roof top or if antenna masts to raise the height a
A chopper working from a220 V.d.c. source is operating at frequency of 50 Hz. and is connected to an R L load of R = 5 Ω and L = 40 mH. Determine the value of duty cycle at which the minimum l
If the collector of a transistor is connected to the base terminal, the transistor continues to operate in the forward-active mode, since the B-C junction is not reverse biased biased. Determine the
he armature at the other end of thecommutator is tapped and connected to balanced 3-Phase voltages, sothat a rotating field is produced, The speed of this rotating fieldis 3000 r.p.m. (1) clockwise