Show that the maximum efficiency of a transformer-coupled Class A amplifier is 50%.
Show that the maximum efficiency of a transformer-coupled Class A amplifier is 50%.
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Show that the maximum efficiency of a transformer-coupled Class A amplifier is 50%.
A transformer-coupled FE power amplifier must deliver an output of 0.5 Watt to an class ?...
A transformer-coupled FE power amplifier must deliver an output of 0.5 Watt to an class ? istor has ?-100 and VBE 0.7 V. Assume zero resistance in the transformer. What ansistor power rating is needed? o Vcc Ce R2 Vin
Consider a class-A power amplifier using output transformer as in the beside figure, where the transformer ration N=1.5. β=100, VBE =0,6V
Consider a class-A power amplifier
using output transformer as in the
beside figure, where the transformer
ration N=1.5. β=100, VBE
=0,6V. Determine:
a/ Maximum power consumed by the
load RL
. b/ Average power supplied by the DC
source. c/ Efficiency of the circuit. d/ Average power dissipation of BJT
A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
A 40-KVA, 50 Hz transformer was found to have an efficiency of
97% at full-load, 0.8 power factor lagging. It was also found that
the maximum efficiency was obtained at 82% full-load, at the same
power factor. Determine the core loss Pi , copper loss at full load
Pcufl and the maximum efficiency of the transformer ηmax at 0.8
power factor lagging?
Question 1 A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
2) Show that in a 50% reaction turbine stage, the maximum stage efficiency is a is...
2) Show that in a 50% reaction turbine stage, the maximum stage efficiency is a is the nozzle angle. 2cosa where 1+ cosa
QUESTION 19 A class B amplifier conducts for O a. 90° of input cycle O b....
QUESTION 19 A class B amplifier conducts for O a. 90° of input cycle O b. 180° of input cycle O c. 270° of input cycle O d. 360° of input cycle QUESTION 20 The maximum efficiency of a class A power amplifier is O a. 50 % b. 25 % OC. 75 % d. 95 %
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output...
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output stages with rospect to their power-conversion officiencies. b) Assume that an emitter follower 9, is used as a class-A output stago, with the constant current supplied by another transistor 2. (as in Figure Q.4.a). Let Vcc=16V, 1 =100mA, and R=10002. If the output voltage is an 4-V-peak sinusoid, find the power conversion efficiency. VC Figure Q.4.a c) Explain the crossover distortion in a class-B...
Un 100nFR out 2kC2 4.7uF Figure 3-3 (a) AC-coupled and (b) DC-coupled non-inverting AC-amplifier a) Why do you need a 100kS2 resistor to ground in the AC-coupled amplifier? b) Wharis the mainal and m...
Un 100nFR out 2kC2 4.7uF Figure 3-3 (a) AC-coupled and (b) DC-coupled non-inverting AC-amplifier a) Why do you need a 100kS2 resistor to ground in the AC-coupled amplifier? b) Wharis the mainal and minima input ipedane Z- of this a ih freguencies do they occur? c) Where is the 3dB breakpoint frequency for the amplifier in Figure 3-3b? d) How large is Zin at the 3dB breakpoint frequency? e) What are the differences between the two circuits in Figure 3-3a...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the following wattmeter reading: (10 X 3 = 30 Marks) Open-circuit Test wattmeter reading: 100 W (at rated voltage) Short-circuit Test wattmeter reading: 60 W (test conducted at 50% load condition) (a) Calculate the efficiency of the transformer when it delivers full load at 0.8 pflagging. (b) Calculate the output when transformer operating at maximum efficiency and also calculate the maximum efficiency. (c) Load on...
In a given transformer, 87% of the flux produced in the primary is coupled into the...
In a given transformer, 87% of the flux produced in the primary is coupled into the secondary winding, what is the coefficient of coupling? A) 0.87 B) 13 C) 87 D) 0.13
worksheet 8 second 10. When would you most likely couple stages of an amplifier with a...
worksheet 8 second
10. When would you most likely couple stages of an amplifier with a tuned transformer? 11. What are the major drawbacks of transformer coupling? 12. In high frequency applications, what does an ideal amplifier do? 13. What determines the bandwidth of a tuned amplifier? 14. What is the difference between a capacitively coupled amplifier and a direct- coupled amplifier? 15. What are some advantages and disadvantages of negative feedback? 16. What is the purpose of the capacitor...
A transformer-coupled FE power amplifier must deliver an output of 0.5 Watt to an class ? istor has ?-100 and VBE 0.7 V. Assume zero resistance in the transformer. What ansistor power rating is needed? o Vcc Ce R2 Vin
A 40-KVA, 50 Hz transformer was found to have an efficiency of
97% at full-load, 0.8 power factor lagging. It was also found that
the maximum efficiency was obtained at 82% full-load, at the same
power factor. Determine the core loss Pi , copper loss at full load
Pcufl and the maximum efficiency of the transformer ηmax at 0.8
power factor lagging?
Question 1 A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
2) Show that in a 50% reaction turbine stage, the maximum stage efficiency is a is the nozzle angle. 2cosa where 1+ cosa
QUESTION 19 A class B amplifier conducts for O a. 90° of input cycle O b. 180° of input cycle O c. 270° of input cycle O d. 360° of input cycle QUESTION 20 The maximum efficiency of a class A power amplifier is O a. 50 % b. 25 % OC. 75 % d. 95 %
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output stages with rospect to their power-conversion officiencies. b) Assume that an emitter follower 9, is used as a class-A output stago, with the constant current supplied by another transistor 2. (as in Figure Q.4.a). Let Vcc=16V, 1 =100mA, and R=10002. If the output voltage is an 4-V-peak sinusoid, find the power conversion efficiency. VC Figure Q.4.a c) Explain the crossover distortion in a class-B...
Un 100nFR out 2kC2 4.7uF Figure 3-3 (a) AC-coupled and (b) DC-coupled non-inverting AC-amplifier a) Why do you need a 100kS2 resistor to ground in the AC-coupled amplifier? b) Wharis the mainal and minima input ipedane Z- of this a ih freguencies do they occur? c) Where is the 3dB breakpoint frequency for the amplifier in Figure 3-3b? d) How large is Zin at the 3dB breakpoint frequency? e) What are the differences between the two circuits in Figure 3-3a...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the following wattmeter reading: (10 X 3 = 30 Marks) Open-circuit Test wattmeter reading: 100 W (at rated voltage) Short-circuit Test wattmeter reading: 60 W (test conducted at 50% load condition) (a) Calculate the efficiency of the transformer when it delivers full load at 0.8 pflagging. (b) Calculate the output when transformer operating at maximum efficiency and also calculate the maximum efficiency. (c) Load on...
worksheet 8 second
10. When would you most likely couple stages of an amplifier with a tuned transformer? 11. What are the major drawbacks of transformer coupling? 12. In high frequency applications, what does an ideal amplifier do? 13. What determines the bandwidth of a tuned amplifier? 14. What is the difference between a capacitively coupled amplifier and a direct- coupled amplifier? 15. What are some advantages and disadvantages of negative feedback? 16. What is the purpose of the capacitor...
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