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Worksheets3ph controlled rectifier, DC chopper, AC voltage Controller
Total questions: 16
Worksheet time: 4hrs 46mins
Name
Class
Date
1.
[15 minutes] These input and output waveform is belong to...
a)
3 phase controlled full-wave rectifier with R load
b)
3 phase controlled full-wave rectifier with inductive load and line inductance
c)
3 phase controlled half-wave rectifier with inductive load and line inductance
d)
1 phase controlled full-wave rectifier with R load
2.
[15 minutes] Name the circuit
a)
Three phase controlled full-wave rectifier with R load
b)
Three phase controlled half-wave rectifier with R load
c)
Three phase uncontrolled full-wave rectifier with R load
d)
Single phase controlled full-wave rectifier with R load
3.
[15 minutes] A three-phase full-wave controlled rectifier is operated from a three-phase Y-connected 415 V, 50 Hz supply, and the load resistance is R = 12 Ohm. If it is required to obtain an average voltage of 50% of the maximum possible output voltage, calculate (hint : refer chapter 3, eg. 6)
(a) the delay angle
(a) the delay angle
a)
45 degree
b)
55 degree
c)
60 degree
d)
30 degree
4.
[15 minutes] A three-phase full-wave controlled rectifier is operated from a three-phase Y-connected 415 V, 50 Hz supply, and the load resistance is R = 12 Ohm. If it is required to obtain an average voltage of 50% of the maximum possible output voltage, calculate (hint : refer chapter 3, eg. 6)
(b) the RMS and average output currents
(b) the RMS and average output currents
a)
24.33 Arms and 19.33 A
b)
26.49 Arms and 23.35 A
c)
25 Arms and 20.35 A
d)
30.02 Arms and 24 A
5.
[15 minutes] A three-phase full-wave controlled rectifier is operated from a three-phase Y-connected 415 V, 50 Hz supply, and the load resistance is R = 12 Ohm. If it is required to obtain an average voltage of 50% of the maximum possible output voltage, calculate (hint : refer chapter 3, eg. 6)
(c) the average and RMS thyristor currents
(c) the average and RMS thyristor currents
a)
9.784 A and 17.29 Arms
b)
5.784 A and 14.29 Arms
c)
7.784 A and 15.29 Arms
d)
11.784 A and 16.29 Arms
6.
[15 minutes] A three-phase full-wave controlled rectifier is operated from a three-phase Y-connected 415 V, 50 Hz supply, and the load resistance is R = 12 Ohm. If it is required to obtain an average voltage of 50% of the maximum possible output voltage, calculate (hint : refer chapter 3, eg. 6)
(d) the efficiency
(d) the efficiency
a)
77.74%
b)
80.44%
c)
75.10%
d)
50%
7.
[15 minutes] The given AC voltage controller circuit is a....
a)
Half-wave controller
b)
Full-wave controller
c)
none of the mentioned
d)
will depend upon firing angle
8.
[15 minutes] In the principle of phase control.......
a)
the load is on for few cycles and off for few cycles
b)
control is achieved by adjusting the firing angle of the devices
c)
control is achieved by adjusting the number of on and off cycles
d)
phase control cannot be achieved
9.
[15 minutes] Applications of AC voltage controller are......
a)
Control of heating in industrial heating loads and illumination in a lighting control system
b)
power generation and conveyor belt motion
c)
power transmission and RF system
d)
conversion of DC power to AC power
10.
[15 minutes] A single-phase AC voltage controller has been used to drive an AC motor. Analysis of the input voltage and current the motor gave the following values (above):(hint : refer chap 4, eg 5)
(a) Determine the individual RMS fundamental component of the input voltage
(a) Determine the individual RMS fundamental component of the input voltage
a)
V3 RMS = 15/sqrt 2 , V3 RMS = 10.607 V, θ = -15 degree
b)
V5 RMS = 8/sqrt 2 , V3 RMS = 5.657 V, θ = -20 degree
c)
V1 RMS = 339.4/sqrt 2 , V1 RMS = 239.992 V, θ = 0 degree
11.
[15 minutes] A single-phase AC voltage controller has been used to drive an AC motor. Analysis of the input voltage and current the motor gave the following values (above):(hint : refer chap 4, eg 5)
(a) Determine the third RMS harmonics component of the input current
(a) Determine the third RMS harmonics component of the input current
a)
I3 = 5.385 , I3 RMS = 5.385/sqrt 2 = 3.808
b)
I3 = 9.335 , I3 RMS = 9.335/sqrt 2 = 6.6
c)
I3 = 4.2 , I3 RMS = 4.2 /sqrt 2 = 2.97
12.
[15 minutes] What is the duty cycle of a chopper ?
a)
Ton/Toff
b)
Toff x Ton
c)
T/Ton
d)
Ton/T
13.
[15 minutes] The values of duty cycle (α) lies between......
a)
0 to 100
b)
-1 to 1
c)
0 to -100
d)
0 to 1
14.
[15 minutes] A buck-boost DC-DC converter gas the following parameters; (hint; refer chapter 5, eg 3)
Assuming ideal components, calculate;
a) the output voltage,
Assuming ideal components, calculate;
a) the output voltage,
a)
24 V
b)
36 V
c)
12 V
d)
48 V
15.
[15 minutes] A buck-boost DC-DC converter gas the following parameters; (hint; refer chapter 5, eg 3)
Assuming ideal components, calculate;
b) the average inductor current and the change of inductor current,
Assuming ideal components, calculate;
b) the average inductor current and the change of inductor current,
a)
3.3 A and 5 A
b)
5.5 A and 10 A
c)
4.8 A and 8 A
d)
11 A and 15 A
16.
[15 minutes] A buck-boost DC-DC converter gas the following parameters; (hint; refer chapter 5, eg 3)
Assuming ideal components, calculate;
c)the maximum and minimum inductor current, and
Assuming ideal components, calculate;
c)the maximum and minimum inductor current, and
a)
8.8 A and 0.8 A
b)
5.5 A and 0.1 A
c)
5.8 A and 8 A
d)
11 A and 15 A
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