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MCQ
BASIC ELECTRONICS
CONTROL SYSTEM ENGINEERING
DIGITAL ELECTRONICS
ELECTRICAL CIRCUIT ANALYSIS
ELECTRICAL ENERGY CONSERVATION AND AUDITING
ELECTRICAL ENGINEERING MATERIALS
ELECTRICAL MACHINES
ELECTRICAL VEHICLES
ELECTRICAL WIRING
ELECTROMAGNETICS
MEASUREMENT & INSTRUMENTATION
MICROPROCESSOR AND MICROCONTROLLER INTERFACING
POWER ELECTRONICS & DRIVES
POWER SYSTEM
SIGNALS & SYSTEMS
UTILIZATION OF ELECTRICAL ENERGY
POWER ELECTRONICS & DRIVES
Q1.
The reverse recovery time of diode \(t_{rr} = 3.5 \:\mu s\) and the stored charge \(Q_{RR} = 122.5\:\mu C \). Calculate the rate of change of the diode current \(di/dt \).
\(30 \:A/\mu s\)
\(20 \:A/\mu s\)
\(25 \:A/\mu s\)
\(27 \:A/\mu s\)
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Solution
Q2.
The average output voltage \(V_{dc}\) of a half-wave rectifier with resistive load can be given by following expression, where \(V_m\) is the maximum or peak voltage of the AC sinusoidal supply.
\(V_m / \pi \)
\(2V_m / \pi \)
\(V_m / 2 \pi \)
\(4 V_m / \pi \)
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Solution
Q3.
A single-phase full-wave uncontrolled bridge rectifier is supplying a highly inductive load (L/R ratio is very large), the load current is assumed to be smooth and ripple –free. If the supply voltage is 230V, 50Hz, and the inductor load resistance R = 20 \(\Omega\), Calculate the average output current.
20.70 A
10.35 A
15.65 A
5.17 A
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Solution
Q4.
An ideal 230 V, 50 Hz single-phase AC source supplies power to a load resistor \(100\:\Omega\) through a single ideal diode. Calculate the average value of the current.
1.03 A
1.75 A
2.06 A
2.35 A
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Solution
Q5.
In a 3 phase fully controlled converter the firing frequency is
3 times the line frequency
6 times the line frequency
9 times the line frequency
12 times the line frequency
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Solution
Q6.
In a thyristor, the holding current is
More than the latching current
Equal to the latching current
Less than the latching current
Zero
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Solution
Q7.
AC voltage regulators are widely used in
Traction drives
Fan drives
Slip power recovery of induction motor
Synchronous motor drives
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Solution
Q8.
Why resistor is used in snubber circuit?
To minimize the loss
To minimize the charging current
To minimize the discharging current
All of these
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Solution
Q9.
In SMPS, during ON mode, the switch is in _________ mode.
reverse active
active
cut-off
saturation
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Solution
Q10.
In reverse blocking mode of a thyristor
junction J
1
, J
3
is in reverse bias and J
2
is in forward bias.
junction J
1
and J
2
is in forward bias and J
3
is in reverse bias.
junction J
2
is in reverse bias and J
1
, J
3
is in forward bias.
junction J
3
is in forward bias and J
1
, J
2
in reverse bias.
Show Answer
Solution
1
2
3
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