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Year 2024
April
Week # 2
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FAQs
April
Week # 4 Quiz 1
Q1.
A multiplexer has
One data input and two or more than two data outputs
One data output and two or more than two data inputs
One data output and a number of data input and a number of select inputs
One data output and a number of select inputs
Q2.
A buck converter operating at duty cycle of 0.5 with input voltage of 150 V dc supplies an RLE load consist of R = 5 \(\Omega\), L = 4 mH, E = 50V. The input current of the buck converter will be,
3.5A
3A
2.5A
1.5A
Q3.
A dc voltage source of 250 V is supplying R-L load through an SCR and latching current for an SCR is 130 mA . Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 25 \(\Omega\) in series with L = 0.5 H.
\(260 \mu s\)
\(320 \mu s\)
\(150 \mu s\)
\(170 \mu s\)
Q4.
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
Q5.
In a series circuit which includes \(R = 2.4\: \Omega ,\: L = 25\: \mu H\), capacitor C and a thyristor for obtaining self commutation in the circuit, the value of capacitor should be
\(20 \:\mu F\)
\(30 \:\mu F\)
\(25 \:\mu F\)
\(10 \:\mu F\)
Q6.
The 440V is applied to 3 phase AC to DC diode rectifier with resistive load circuit. The average dc voltage across the load will be ______V
594
954
495
945
Q7.
The effective channel length of a MOSFET in a saturation decreases with increase in
gate voltage
drain voltage
source voltage
body voltage
Q8.
The figure shown above represents construction of which of the following?
Diode
Transistor
MOSFET
SCR
Q9.
In DC chopper
Input wave form is continuous
Output wave form is discontinuous
Both (A) and (B)
Input and output waveforms are chopped
Q10.
single phase full wave thyristor converter is supplying an RL load. The supply voltage is 200 V, and triggering angle is 60º. If the load is drawing a constant current from the source the output voltage will be
75 V
90 V
135 V
110 V
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