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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Single Phase FW AC-DC - 1 - Electrical Engineering (EE) MCQ

Test: Single Phase FW AC-DC - 1 - Electrical Engineering (EE) MCQ


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30 Questions MCQ Test - Test: Single Phase FW AC-DC - 1

Test: Single Phase FW AC-DC - 1 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Single Phase FW AC-DC - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Single Phase FW AC-DC - 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Single Phase FW AC-DC - 1 below.
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Test: Single Phase FW AC-DC - 1 - Question 1
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The below shown single phase controlled rectifier configuration is a

Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 1

 It is a two pulse i.e full wave M-2 connection.

Test: Single Phase FW AC-DC - 1 - Question 2
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 In the below shown circuit, considering the load to be purely R load, the thyristor T2 would conduct from ωt =

Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 2

The bottom winding forward biases the SCR T2 at π, conduction starts after the pulse is given at α & stops when T2 is naturally commutated at 2π.

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Test: Single Phase FW AC-DC - 1 - Question 3
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For a single pulse M-2 rectifier with RL load and firing angle α >0°, the value of the inductance L is such that the load current is continuous.

Choose the correct statement.

Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 3

As mentioned, L is such that the load current is continuous. Hence, it never falls below a predefined positive value.

Test: Single Phase FW AC-DC - 1 - Question 4
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For the circuit below, the transformer ratio is 1:1 and Vs = Vm sinωt. When T1 is forward biased and is triggered at α than T2 is
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 4

When T1 is gated, the other SCR T2 is reversed biased due to the windings so connected.

Test: Single Phase FW AC-DC - 1 - Question 5
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The circuit turn-off time of M-2 type connection is
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 5

When T1 is gated, SCR T2 is off from ωt = α to π
Thus t = π-α(offtime)/ω
Same can be said when T2 is gated and T2 is off.

Test: Single Phase FW AC-DC - 1 - Question 6
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Find the expression for the average value of the output voltage for the below given circuit. Consider the load current to be continuous, firing angle = α, transformer ration 1:1 and Vs = Vm sinωt.
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 6

As the load current is continues, the voltage is positive from α to π and negative from π to π+α and so on. Thus,
Vavg = 1/Period ∫ Vm sin⁡ωt d(ωt)
Where period = π
And the integral runs from α to α+π.

Test: Single Phase FW AC-DC - 1 - Question 7
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A fully controlled converter uses
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 7

 Fully controlled implys that all the elements are “fully controlled” hence, it uses SCRs only except the FD.

Test: Single Phase FW AC-DC - 1 - Question 8
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A single phase full-converter using R load is a _________ quadrant converter and that using an RL load without FD is a __________ quadrant converter
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 8

In R load both V and I are positive, in RL load the voltage can be negative but current is always positive.

Test: Single Phase FW AC-DC - 1 - Question 9
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 A single phase full controlled bridge converter (B-2) uses
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 9

4 SCR’s are connected in a bridge fashion.

Test: Single Phase FW AC-DC - 1 - Question 10
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 In a B-2 type full controlled bridge converter
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 10

B-2 is the bridge type controller, in which 2 devices conduct at a time. One acting as the current supplying path and other acts as a return path.

Test: Single Phase FW AC-DC - 1 - Question 11
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For the below given circuit,
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 11

 T1-T2 are gated together at a time and T3-T4 are gated together at a time.

Test: Single Phase FW AC-DC - 1 - Question 12
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With respect to the below given circuit, from ωt = 0 to α, ____ thyristor(s) block the forward voltage
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 12

 T1 and T2 are not yet gated, hence they block the forward voltage.

Test: Single Phase FW AC-DC - 1 - Question 13
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With respect to the below given circuit, from ωt = 0 to α,
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 13

T1 and T2 are not yet gated, hence they block the forward voltage where as no voltage exists across T3 and T4.

Test: Single Phase FW AC-DC - 1 - Question 14
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 For the below given circuit, when the devices T1 and T2 are conducting from ωt = α till they are naturally commutated at π voltage across the other two pair of devices is
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 14

When T1 and T2 are conducting they act like S.C’s and the other pair of devices i.e. T3 and T4 has to take care of the reverse voltage.

Test: Single Phase FW AC-DC - 1 - Question 15
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A single-phase full converter B-2 type connection has a RLE type of motor load connected. The minimum requirement to turn-on the device is
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 15

Device will not turn on until the supply voltage exceeds the motor back emf E.

Test: Single Phase FW AC-DC - 1 - Question 16
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For the below shown circuit with continuous load current.

Each thyristor pair conducts for
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 16

 As the load current is continuous each pair conducts from π to π+α i.e π radians.

Test: Single Phase FW AC-DC - 1 - Question 17
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 For the below given circuit
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 17

 T1-T2 are gated together at a time and T3-T4 are gated together at a time.

Test: Single Phase FW AC-DC - 1 - Question 18
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 For the below shown circuit has dis-continuous load current waveform.

Each thyristor pair conducts for
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 18

Load current is discontinues than SCR pair conducts for less than 90° depending on the value of the inductor L.

Test: Single Phase FW AC-DC - 1 - Question 19
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 A single-phase full converter with B-2 type of connection has a continuous load current waveform. The thyristor pairs T3, T4 is triggered at ωt =
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 19

 First, at α T1-T2 conduct, then after π+α the next pair is excited i.e. T3-T4 and likewise.

Test: Single Phase FW AC-DC - 1 - Question 20
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The PIV for each diode in a single-phase, full converter with B-2 type of controlled rectifier is

Consider supply voltage as Vs = Vm sinωt.
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 20

The peak inverse voltage handled by each device is Vm in case of B-2 type of configuration.

Test: Single Phase FW AC-DC - 1 - Question 21
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The below shown rectifier configuration has continues load current, find the expression for the average value of output voltage when the supply Vs = Vm sinωt is connected.
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 21

Vo = 1/π x [∫ Vm sinωt d(ωt)] Where the integration runs from α to π+α.

Test: Single Phase FW AC-DC - 1 - Question 22
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Find the expression of the rms value of output voltage for a single-phase M-2 type rectifier with RL load and continues load current. Transformer ratio is 1:1 with supply voltage Vs = Vm sinωt
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 22

Vor2 = 1/π x [∫ Vm2 sin2ωt d(ωt)], Where the integration runs from α to π+α
Vor = Vm2/2 = Vs.

Test: Single Phase FW AC-DC - 1 - Question 23
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 A single-phase full controlled converted with RLE load will act like a line-commutated inverter when the firing angle α
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 23

It will act like a inverter i.e. most of the current would flow from the battery or back emf E to the source. For α=90° it will not act like a converter nor an inverter.

Test: Single Phase FW AC-DC - 1 - Question 24
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 In converter operation, with output voltage = Vo and RLE load.
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 24

The output voltage obtained by a converter is always greater than the counter or back emf E.
Vo = IR + E.

Test: Single Phase FW AC-DC - 1 - Question 25
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In inverter operation, with output voltage = Vo and a RLE load connected
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 25

 In inverter operation Vo < E.

Test: Single Phase FW AC-DC - 1 - Question 26
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A motor load is connected to a single-phase full converter B-2 type controlled rectifier, the net energy is transferred from ac source to the motor (dc load) when
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 26

 It works as a converter when π-α < α.

Test: Single Phase FW AC-DC - 1 - Question 27
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The below shown rectifier configuration has continues load current, find the expression of the RMS value of output voltage when the supply Vs = Vm sinωt
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 27

 Vor2 = 1/π x [∫Vm2 sin2ωt d(ωt)] Where the integration runs from α to π+α
Vor = Vm2/2 = Vs.

Test: Single Phase FW AC-DC - 1 - Question 28
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Choose the correct statement
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 28

The PIV of diodes in M-2 is 2Vm, whereas that in B-2 type of connection is Vm.

Test: Single Phase FW AC-DC - 1 - Question 29
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An SCR has the peak forward voltage = 1000 V. Find the maximum voltage that the SCR can handle if employed in a M-2 type full controlled converter circuit. Use factor of safety (FOS) = 2.5
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 29

In M-2 type configuration maximum voltage handled is 2Vm
Therefore, 1000/2×2.5 = 200 V.

Test: Single Phase FW AC-DC - 1 - Question 30
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A single-phase diode bridge rectifier is used to supply a highly inductive load. If the load current is assumed to be ripple free, then the input current at the ac side of the rectifier will be
Detailed Solution for Test: Single Phase FW AC-DC - 1 - Question 30

1ϕ full wave rectifier:

Case 1:  α < ωt < π + α 

SCR1 and SCR4 conduct.

Vo = Vs 

Io = Is

Case 2:  π + α < ωt < 2π + α 

SCR2 and SCR3 conduct.

Vo = - Vs 

Is = - Io 

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