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Year 2024
February
Week # 4
Expire on 21 Mar 2024
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FAQs
February
Week # 4 Quiz 1
Q1.
Which of the following shift register will require minimum number of clock pulses to give the output?
Serial In Serial Out (SISO)
Parallel In Serial Out (PISO)
Serial In Parallel Out (SIPO)
Parallel In Parallel Out (PIPO)
Q2.
A single-phase thyristor-bridge rectifier is fed from a 230V, 50 Hz, single-phase, AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30°, then value of the power factor at AC mains is
0.87
0.9
0.78
0.45
Q3.
Figure shows two thyristors rated 350 A sharing a load current. Current through \(T_2\) is 180A. Current through \(T_1\) will be _____ .
190
135
105
180
Q4.
A thyristor has thermal resistance is 1.8 °C/W and the maximum allowable internal power dissipation is 50 W. If the ambient temperature is 40 °C, the maximum allowable Junction temperature is
110 °C
130 °C
50 °C
90 °C
Q5.
The fully controlled thyristor converter in the figure is fed from a single phase source. When the firing angle is 0˚, the DC output voltage of the converter is 300 V. What will be the output voltage for firing angle of 60˚? (Assume continuous conduction) <br><br>
150 V
300 V
210 V
100π V
Q6.
A boost converter operating at duty cycle of 0.5 with input voltage of 100 V dc suppling a resistive load of 100 \(\Omega\). The input current of the buck converter will be,
4A
8A
2A
1A
Q7.
Identify the expression:
\(\frac{V_{max}}{2\pi R_L}(1+cos\alpha)\)
The average current in a full wave rectifier circuit constructed with the help of diodes
The average current in a full wave rectifier circuit constructed with the help of SCRs
The average current in a half wave rectifier circuit constructed with the help of diodes
The average current in a half wave rectifier circuit constructed with the help of SCRs
Q8.
A half-controlled single-phase bridge rectifier is supplying an R-L load. It is operated at a firing angle \(\alpha\) and the load current is continuous. The fraction of cycle that the freewheeling diode conducts is
\(\alpha / \pi\)
\(\pi\)
\(\pi + \alpha\)
\(\pi - \alpha\)
Q9.
5 thyristors rated 200 V in series. The operating voltage of the string is 900 V. Derating factor of the string is
0.2
0.1
0.9
0.8
Q10.
A step down DC chopper has input voltage of 200 V with 10 Ω load resistor connected, voltage drop across chopper is 2 V when it is ON. For a duty cycle of 0.6, calculate the average value of output voltage.
131 V
154 V
118.8 V
121.2 V
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