A. Peak inverse voltage
B. Peak insert voltage
C. Paas Inverse volatile
D. Peak insert volatile
Answer: A
PIV stands for Peak inverse voltage. It is the maximum negative voltage after which the thyristor will break down.
42. Calculate the PIV for the Full-wave bridge rectifier if the peak value of the supply voltage is 230.
A. 324.4 V
B. 325.2 V
C. 524.4 V
D. 626.8 V
Answer: A
The peak inverse voltage for the Full-wave bridge rectifier is
Vm = √2×230 = 325.2 V.
The peak inverse is the maximum negative voltage across the thyristor.
43. In single-phase RLE load, calculate the Peak inverse voltage using the data: (Vs)r.m.s = 89 V, f = 50 Hz, E = 440 V.
A. 521.2 V
B. 527.8 V
C. 597 V
D. 529 V
Answer: C
In a single-phase, RLE load the peak inverse voltage across the thyristor VT = Vm+E = 529 V.
44. Full form of DAC is ___________
A. Digital to Analog converter
B. Discrete to Analog converter
C. Digital to AC converter
D. Discrete to Avalanche converter
Answer: A
DAC stands for Digital to Analog converter. It converts the digital signal to an analog signal. It is used in microcontrollers and microprocessors.
45. Full form of ADC is ___________
A. Analog to Digital converter
B. Discrete to Analog converter
C. Analog to Digital converter
D. Discrete to Avalanche converter
Answer: C
ADC stands for Analog to Discrete converter. It converts the analog signal to a discrete signal. It is used in microcontrollers and microprocessors.
46. Calculate the voltage across the freewheeling diode when the output voltage is 24 V.
A. -15 V
B. -24 V
C. 28 V
D. 39 V
Answer: B
The freewheeling diode is used to provide a freewheeling path. It is connected in the anti-parallel direction of the load. The voltage across the diode is -Vo = -24 V.
47. Calculate the value of the conduction angle for SCR for R-L load with a freewheeling diode if the value of β and α are 65° and 12°.
A. 168°
B. 170°
C. 130°
D. 180°
Answer: A
The conduction angle for SCR for R-L load with a freewheeling diode is
π-α = 180°-12° = 168°.
R-L load is a current stiff type of load. The current in the SCR only flows from α to π.
48. Calculate the value of the conduction angle for the diode for R-L load with a freewheeling diode if the value of α is 45°. (Continous conduction mode)
A. 220°
B. 225°
C. 230°
D. 280°
Answer: B
The conduction angle for the diode for R-L load with a freewheeling diode is
π+α = 180°+45° = 225°.
R-L load is a current stiff type of load.
49. Calculate the value of the conduction angle for the diode for R-L load with a freewheeling diode if the value of β is 226°. (Discontinuous conduction mode)
A. 40°
B. 45°
C. 50°
D. 46°
Answer: B
The conduction angle for the diode for R-L load with a freewheeling diode is
β-π = 226°-180° = 45°.
R-L load is a current stiff type of load.
50. Calculate the value of the conduction angle for R-L load if the value of β and α are 56° and 18°.
A. 48°
B. 38°
C. 57°
D. 15°
Answer: B
The conduction angle for R-L load is
β-α = 56°-18° = 38°.
R-L load is a current stiff type of load. The current in the circuit only flows from α to β.
