DC Motor Systems MCQ Questions & Answers

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