DC Motor Systems MCQs : This section focuses on the "DC Motor Systems". These Multiple Choice Questions (MCQs) should be practiced to improve the DC Motor Systems skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Calculate the average value of the current through the thyristor in case of 1-? Full wave bridge rectifier if the value of the load current is 42 A.
A. 21 A
B. 12 A
C. 14 A
D. 16 A
Question 2
Calculate the conduction angle in purely inductive load if the firing angle is ?÷2.
A. 205°
B. 175°
C. 180°
D. 195°
Question 3
Calculate the displacement factor if the fundamental voltage is 24sin(140?t-240°) and fundamental current is 47sin(140?t-120°).
A. -0.5
B. -0.7
C. 0.9
D. 0.4
Question 4
Calculate the extinction angle in purely inductive load if the firing angle is ?÷4.
A. 315°
B. 145°
C. 345°
D. 285°
Question 5
Calculate the PIV for the Mid-point configuration of Full-wave rectifier if the peak value of the supply voltage is 311.
A. 622 V
B. 620 V
C. 624 V
D. 626 V
Question 6
Calculate the r.m.s value of the current through the thyristor in case of 1-? Full wave bridge rectifier if the value of the load current is 2 A.
A. 1.414 A
B. 1.214 A
C. 1.347 A
D. 1.657 A
Question 7
Calculate the value of THD value for 1-? Full wave bridge rectifier.
A. 48.43 %
B. 47.25 %
C. 49.26 %
D. 50.48 %
Question 8
Calculate the value of the fundamental displacement factor for 1-? Full wave bridge rectifier if the firing angle value is 60°.
A. 0.5
B. 0.4
C. 0.2
D. 0.8
Question 9
Calculate the value of the fundamental displacement factor for 1-? Full wave semi-converter if the firing angle value is 20°.
A. 0.82
B. 0.98
C. 0.74
D. 0.26
Question 10
Calculate the value of the Input power factor for 1-? Full wave bridge rectifier if the firing angle value is 45°.
A. 0.65
B. 0.64
C. 0.61
D. 0.63
Question 11
In Half-wave controlled rectifier calculate the average value of the voltage if the supply is 10sin(50t) and firing angle is 30°.
A. 2.32 V
B. 2.97 V
C. 4.26 V
D. 5.64 V
Question 12
In Half-wave uncontrolled rectifier calculate the average value of the voltage if the supply is 23sin(50t).
A. 7.32 V
B. 8.32 V
C. 9.32 V
D. 7.60 V
Question 13
In single phase RLE load, calculate the voltage across the thyristor when current decays to zero using the data: (Vs)r.m.s=220 V, f=40 Hz, R=1 ?, E=90 V, ?=230°.
A. -328.33 V
B. -325.48 V
C. -254.85 V
D. -284.48 V
Question 14
RLE load is a voltage stiff load.
A. True
B. False
Question 15
RLE load is also known as DC motor load.
A. True
B. False
Question 16
Calculate the average value of the current through the thyristor in case of 1-Φ Full wave bridge rectifier if the value of the load current is 42 A.
A. 21 A
B. 12:00 AM
C. 14 A
D. 16 A
Question 17
Calculate the conduction angle in purely inductive load if the firing angle is π÷2.
A. 205°
B. 175°
C. 180°
D. 195°
Question 18
Calculate the displacement factor if the fundamental voltage is 24sin(140πt-240°) and fundamental current is 47sin(140πt-120°).
A. -0.5
B. -0.7
C. 0.9
D. 0.4
Question 19
Calculate the extinction angle in purely inductive load if the firing angle is π÷4.
A. 315°
B. 145°
C. 345°
D. 285°
Question 20
Calculate the r.m.s value of the current through the thyristor in case of 1-Φ Full wave bridge rectifier if the value of the load current is 2 A.
A. 1.414 A
B. 1.214 A
C. 1.347 A
D. 1.657 A
Question 21
Calculate the value of THD value for 1-Φ Full wave bridge rectifier.
A. 48.43%
B. 47.25%
C. 49.26%
D. 50.48%
Question 22
Calculate the value of the fundamental displacement factor for 1-Φ Full wave bridge rectifier if the firing angle value is 60°.
A. 0.5
B. 0.4
C. 0.2
D. 0.8
Question 23
Calculate the value of the fundamental displacement factor for 1-Φ Full wave semi-converter if the firing angle value is 20°.
A. 0.82
B. 0.98
C. 0.74
D. 0.26
Question 24
Calculate the value of the Input power factor for 1-Φ Full wave bridge rectifier if the firing angle value is 45°.
A. 0.65
B. 0.64
C. 0.61
D. 0.63
Question 25
In single phase RLE load, calculate the voltage across the thyristor when current decays to zero using the data: (Vs)r.m.s=220 V, f=40 Hz, R=1 Ω, E=90 V, β=230°.
A. -328.33 V
B. -325.48 V
C. -254.85 V
D. -284.48 V