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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 WIRING
ELECTROMAGNETICS
MEASUREMENT & INSTRUMENTATION
MICROPROCESSOR AND MICROCONTROLLER INTERFACING
POWER ELECTRONICS & DRIVES
POWER SYSTEM
SIGNALS & SYSTEMS
UTILIZATION OF ELECTRICAL ENERGY
POWER ELECTRONICS & DRIVES
Q1.
When the cathode voltage of a thyristor is made more positive than its anode
All junctions are reverse biased
All junctions are forward biased
Outer junctions are reverse biased
Outer junctions are forward biased
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Solution
Q2.
A buck-boost converter is operated in the continuous condition mode is steady state with a constant duty ratio D. If \(V_o\) is the magnitude of the DC output voltage and if \(V_s\) is the magnitude of the DC input voltage, the ratio of \(\frac{V_o}{V_s}\) is
D
1-D
1/(1-D)
D/(1-D)
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Solution
Q3.
Three phase 6-pulse rectifier is also known as 3-phase,
half-wave rectifier
full-wave rectifier
quarter-wave rectifier
None of the above
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Solution
Q4.
In a thyristor the ratio of latching current to holding current is
2.7
1
0.5
5
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Solution
Q5.
The SCR is turned off, when the anode current fall below
Forward current rating
Holding current
Latching current
Load current
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Solution
Q6.
A single phase controller feeds an IM (A) and heater (B), in both loads
fundamental and harmonics are useful
In A only fundamental and in B only harmonics are useful
In B only fundamental and in A only harmonics are useful
In A only fundamental and in B both are useful
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Solution
Q7.
When the firing angle \(\alpha\) of a single phase fully controlled rectifier feeding constant dc current into the load is 30°, the displacement factor of the rectifier is
0.5
0
1
0.866
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Solution
Q8.
The GTO can be turned off
By a positive gate pulse
By a negative gate pulse
By a negative anode-cathode voltage
By removing the gate pulse
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Solution
Q9.
An SCR chopper circuit supplies power to a DC motor. What will be the nature of motor armature current?
Sinusoidal
Exponential rise and decay
Rectangular
Constant
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Solution
Q10.
The latching current of SCR is 20 mA. Its holding current will be
23mA
40mA
10mA
60mA
Show Answer
Solution
1
2
3
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