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
Question 24
In 3-Φ 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