Question 43 (1 point) A triac is used for ac because A) it is turned off...
Question 43 (1 point)
A triac is used for ac because
A) it is turned off when the ac voltage reaches zero.
B) it can deliver more power to the load in a cycle.
C) it conducts on both alternations.
D) All of the above.
Homework Answers
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Question 43 (1 point)
A triac is used for ac because
A) it is turned off...
I. The ac voltage controller in Figure 1 uses on-off control for heating a resistive load...
I. The ac voltage controller in Figure 1 uses on-off control for heating a resistive load of R-4Ω and the input voltage is Vs-208V(rms),60Hz. If the desired output power is Po=3kW, determine (a) the duty cycle D, and (b) the input power factor Triac vin ) Figure 1
QUESTION 3 Which of the following is not a temperature sensor? O triac O thermocouple O...
QUESTION 3 Which of the following is not a temperature sensor? O triac O thermocouple O resistance temperature detector thermistor QUESTION 4 Sample and hold circuits: O reduce quantization error. increase resolution. convert analog voitages to a binary number O all of the above. QUESTION 5 Since the triac can be triggered to allow current to flow both directions, it can be used in: phase control. O de circuits ac circuits any of the above.
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in...
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in power transmission, why not 10, 20, 49, 50, 60 or any other combination of AC systems? b. Mention four factors to control power flow to the load bus. Why two of these are controllable and the other two are not? c. Suppose you need to transmit 300 MW of power between locations A and B, which are 150 km apart. What level of transmission...
1) What component in a power supply converts ac line voltage to dc voltage? a. Transformer...
1) What component in a power supply converts ac line voltage to dc voltage? a. Transformer b. rectifier diode c. resistor d. capacitor 2) A circuit that provides an entirely positive or negative output voltage when an ac input voltage is applied is called a a. rectifier b. inverter c. filter capacitor d. zener diode 3) A control voltage or current is the a. power factor b. bias c. ground d. load 4) When the voltage at the op amp's...
I have seen similar examples of this question. However, for both 208V and 280V AC power...
I
have seen similar examples of this question. However, for both 208V
and 280V AC power system, the line-to-line voltage seems to be the
same which 120V and that does not make sense. Can you please
justify that in the solution?
A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to a A-connected load. The transmission line has an impedance of (0.06+j0.12) S2/phase, and the load has an impedance of (12+j9) 92 per phase....
AC generators (often called alternators) used in airplanes and submarines are quite common having a frequency...
AC generators (often called alternators) used in airplanes and submarines are quite common having a frequency of 400 HZ and an output voltage of 24 volts (rms). If one of these generators is connected to a diode bridge rectifier with a 4000-μF capacitor. (a) Calculate the load current when a resistive load of 2.4 Ω is connected. (b) Calculate the AC ripple voltage across the above load. (c) Calculate the average current passing through the diodes. (d) Calculate the minimum...
Question 7 1 pts High voltages are used for long-distance electrical power transmission because more voltage...
Question 7 1 pts High voltages are used for long-distance electrical power transmission because more voltage means more power. high voltage prevents people from stealing the electricity. wires are better conductors at high voltages. the low currents allowed by high voltage means less power lost as heat in the wire. Water can be boiled by placing it in vacuum, because slow-moving molecules get pushed out of the liquid due to the pressure of the liquid. oxygen bubbles are pulled out...
AC generators (often called alternators) used in airplanes and submarines are quite common having a frequency...
AC generators (often called alternators) used in airplanes and submarines are quite common having a frequency of 400 Hz and an output voltage of 24 volts (rms). If one of these generators is connected to a diode bridge rectifier with a 4000-uF capacitor. (a) Calculate the load current when a resistive load of 2.4 12 is connected. (10 points) (b) Calculate the AC ripple voltage across the above load. (10 points) (c) Calculate the average current passing through the diodes....
***Four*** Question 13 (1 point) To ensure maximum power to the load, the maximum power transfer...
***Four***
Question 13 (1 point)
To ensure maximum power to the load, the maximum power transfer
theorem is used to determine which of the following for the
load?
Question 13 options:
A)
Resistance
B)
Voltage
C)
Impedance
D)
Current
Question 14 (1 point)
Because the reactances of a circuit are frequently dependent,
the Thevenin circuit that is found for a particular network is
applicable at any frequency.
Question 14 options:
True
False
Question 15 (1 point)
An application of the...
Q3 A MOSFET is used as a low-side switch to control a 15 2 resistive load...
Q3 A MOSFET is used as a low-side switch to control a 15 2 resistive load from a 24 V DC supply. The MOSFET has Rps,on = 0.2 and fon foff= 40 ns. [2] (a) Draw a suitable circuit. (b) Calculate both the drain current ip and drain-source voltage vps when the MOSFET is off and when it is on. [6] (c) Calculate the power dissipated in the load and in the MOSFET while they switched on. are [4] (d)...
I. The ac voltage controller in Figure 1 uses on-off control for heating a resistive load of R-4Ω and the input voltage is Vs-208V(rms),60Hz. If the desired output power is Po=3kW, determine (a) the duty cycle D, and (b) the input power factor Triac vin ) Figure 1
QUESTION 3 Which of the following is not a temperature sensor? O triac O thermocouple O resistance temperature detector thermistor QUESTION 4 Sample and hold circuits: O reduce quantization error. increase resolution. convert analog voitages to a binary number O all of the above. QUESTION 5 Since the triac can be triggered to allow current to flow both directions, it can be used in: phase control. O de circuits ac circuits any of the above.
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in power transmission, why not 10, 20, 49, 50, 60 or any other combination of AC systems? b. Mention four factors to control power flow to the load bus. Why two of these are controllable and the other two are not? c. Suppose you need to transmit 300 MW of power between locations A and B, which are 150 km apart. What level of transmission...
I
have seen similar examples of this question. However, for both 208V
and 280V AC power system, the line-to-line voltage seems to be the
same which 120V and that does not make sense. Can you please
justify that in the solution?
A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to a A-connected load. The transmission line has an impedance of (0.06+j0.12) S2/phase, and the load has an impedance of (12+j9) 92 per phase....
Question 7 1 pts High voltages are used for long-distance electrical power transmission because more voltage means more power. high voltage prevents people from stealing the electricity. wires are better conductors at high voltages. the low currents allowed by high voltage means less power lost as heat in the wire. Water can be boiled by placing it in vacuum, because slow-moving molecules get pushed out of the liquid due to the pressure of the liquid. oxygen bubbles are pulled out...
AC generators (often called alternators) used in airplanes and submarines are quite common having a frequency of 400 Hz and an output voltage of 24 volts (rms). If one of these generators is connected to a diode bridge rectifier with a 4000-uF capacitor. (a) Calculate the load current when a resistive load of 2.4 12 is connected. (10 points) (b) Calculate the AC ripple voltage across the above load. (10 points) (c) Calculate the average current passing through the diodes....
***Four***
Question 13 (1 point)
To ensure maximum power to the load, the maximum power transfer
theorem is used to determine which of the following for the
load?
Question 13 options:
A)
Resistance
B)
Voltage
C)
Impedance
D)
Current
Question 14 (1 point)
Because the reactances of a circuit are frequently dependent,
the Thevenin circuit that is found for a particular network is
applicable at any frequency.
Question 14 options:
True
False
Question 15 (1 point)
An application of the...
Q3 A MOSFET is used as a low-side switch to control a 15 2 resistive load from a 24 V DC supply. The MOSFET has Rps,on = 0.2 and fon foff= 40 ns. [2] (a) Draw a suitable circuit. (b) Calculate both the drain current ip and drain-source voltage vps when the MOSFET is off and when it is on. [6] (c) Calculate the power dissipated in the load and in the MOSFET while they switched on. are [4] (d)...
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