Three Phase-Resistive Load MCQs : This section focuses on the "Three Phase-Resistive Load". These Multiple Choice Questions (MCQs) should be practiced to improve the Three Phase-Resistive Load 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 current for the 3-? phase Half-wave uncontrolled rectifier if the supply value is 400 V and resistive load value is 5 ?.

A. 54.04 A
B. 57.26 A
C. 51.64 A
D. 58.15 A

Question 2

Calculate the circuit turn-off time for 3-? Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.

A. 730.2 msec
B. 740.8 msec
C. 754.5 msec
D. 755.1 msec

Question 3

Calculate the circuit turn-off time for 3-? Fully controlled rectifier if the firing angle is 170° and supply frequency is 50.5 Hz.

A. 32.4 msec
B. 35.2 msec
C. 39.3 msec
D. 31.5 msec

Question 4

Calculate the form factor if V(r.m.s)=45 V, V(avg)=15 V.

A. 2
B. 5
C. 3
D. 8

Question 5

Calculate the pulse number if the supply frequency is 2? and the output frequency is 2?÷3.

A. 4
B. 5
C. 6
D. 3

Question 6

Calculate the value of the Input power factor for 3-? Fully controlled rectifier if the firing angle value is 16°.

A. 0.96
B. 0.91
C. 0.93
D. 0.94

Question 7

Calculate the Vo(avg) for the 3-? phase Half-wave controlled rectifier if the supply value is 364 V and the value of firing angle is 2°.

A. 247.62 V
B. 245.76 V
C. 214.26 V
D. 233.26 V

Question 8

Calculate the Vo(avg) for the 3-? phase Half-wave controlled rectifier if the supply value is 480 V and the value of firing angle is 92°.

A. 264.02 V
B. 487.26 V
C. 858.26 V
D. 248.25 V

Question 9

Calculate the Vo(avg) for the 3-? phase Half-wave uncontrolled rectifier if the supply value is 440 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. 300.15 V

Question 10

Calculate the Vo(r.m.s) (Highly inductive load) for the 3-? phase Half-wave uncontrolled rectifier if the supply value is 441 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. 300.15 V

Question 11

Full form of SCR is ____________

A. Silicon controlled rectifier
B. State-controlled rectifier
C. State cover rectifier
D. State-controlled reset

Question 12

Full form of TRIAC is __________

A. Triode for Alternating current
B. Tri for Alternating current
C. Triode for Alternating counter
D. Tri for Alternating counters

Question 13

In 3-? Semi-controlled rectifier calculate the average value of the voltage if the supply is 299 V and firing angle is 56.15°.

A. 311.26 V
B. 304.26 V
C. 314.51 V
D. 312.45 V

Question 14

TRIAC is a unipolar switch.

A. True
B. False

Question 15

Calculate the average value of current for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 400 V and resistive load value is 5 Ω.

A. 54.04 A
B. 57.26 A
C. 51.64 A
D. 58.15 A

Question 16

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.

A. 730.2 msec
B. 740.8 msec
C. 754.5 msec
D. 755.1 msec

Question 17

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 170° and supply frequency is 50.5 Hz.

A. 32.4 msec
B. 35.2 msec
C. 39.3 msec
D. 31.5 msec

Question 18

Calculate the pulse number if the supply frequency is 2π and the output frequency is 2π÷3.

A. 4
B. 5
C. 6
D. 3

Question 19

Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 16°.

A. 0.96
B. 0.91
C. 0.93
D. 0.94

Question 20

Calculate the Vo(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 364 V and the value of firing angle is 2°.

A. 247.62 V
B. 245.76 V
C. 214.26 V
D. 233.26 V

Question 21

Calculate the Vo(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 480 V and the value of firing angle is 92°.

A. 264.02 V
B. 487.26 V
C. 858.26 V
D. 248.25 V

Question 22

Calculate the Vo(avg) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 440 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. 300.15 V

Question 23

Calculate the Vo(r.m.s) (Highly inductive load) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 441 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. 300.15 V