Test: Filters

# Test: Filters

Test Description

## 20 Questions MCQ Test Power Electronics | Test: Filters

Test: Filters for Electrical Engineering (EE) 2023 is part of Power Electronics preparation. The Test: Filters questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Filters MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Filters below.
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Test: Filters - Question 1

### In practice the output from the diode rectifier has

Detailed Solution for Test: Filters - Question 1

The output contents along with the DC components the AC harmonics which does no useful work & reduces the efficiency.

Test: Filters - Question 2

### Choose the correct statement

Detailed Solution for Test: Filters - Question 2

A rectifier is used to convert AC to DC. Lower the AC (Non-DC) components in the output lower are the ohmic losses.

Test: Filters - Question 3

### An L filter is connected ________

Detailed Solution for Test: Filters - Question 3

Inductor (L) has a very important property that the current through it cannot change rapidly. We can make use of this property by connecting it in series.

Test: Filters - Question 4

In case of an L filter connected with a rectifier in series with the load, it offers ________ impedance to ac whereas _______ resistance to dc respectively.

Detailed Solution for Test: Filters - Question 4

It offers high impedance to AC such as the AC ripples do not pass through the load.

Test: Filters - Question 5

In case of a C filter, the AC is not allowed to pass to the load by

Detailed Solution for Test: Filters - Question 5

AC ripples are not allowed to pass, by S.C the AC ripples as the C is always connected in parallel with the load.

Test: Filters - Question 6

A capacitor filter or C filter can be used in a rectifier by connecting it

Detailed Solution for Test: Filters - Question 6

AC ripples are not allowed to pass, by S.C the AC ripples as the C is always connected in parallel with the load.

Test: Filters - Question 7

Examine the below shown circuit.

While D7 & D10 are reversed biased the

Detailed Solution for Test: Filters - Question 7

When the two are reversed biased and the other two SCR’s are not yet gated, the stored energy in the capacitor is supply the load R.

Test: Filters - Question 8

When a certain type of filter is connected across the R load of a full wave bridge type diode biased rectifier, the following output voltage waveform is obtained

The filter connected is most likely to be a/an

Detailed Solution for Test: Filters - Question 8

It is to be noted that the waveform is that of a voltage parameter. The voltage goes up for a very small time and than goes down (discharges) for longer time. For every half wave the peak of the waveform is to the left, if it were to be on the right it would be more likely to be a L filter.

Test: Filters - Question 9

For the below given circuit,

When the output current rises, the capacitor current

Detailed Solution for Test: Filters - Question 9

When the load current is increasing, the capacitor is charging through the source voltage & its current keeps on falling & voltage rises.

Test: Filters - Question 10

A single-phase diode B-2 rectifier is fed from a 250 V, 50 Hz source & connected to a load of R = 400 Ω.
Design a capacitor filter such that the ripple factor of the output voltage is less than 5 %. Find the value of the capacitance of the C filter.

Detailed Solution for Test: Filters - Question 10

Use,
C = K * [1 + 1/√2RF] Where, K = 1/4fR.

Test: Filters - Question 11

A diode rectifier with a C filter will have average output voltage _______ than that obtained by a rectifier without the C filter.

Detailed Solution for Test: Filters - Question 11

C filter improves the efficiency and eliminates ripples by keeping the output voltage constant.

Test: Filters - Question 12

An inductor filter connected in series with a resistive load provides a

Detailed Solution for Test: Filters - Question 12

Filter is always connected to the load side (output). Inductor has the property of keeping the current smooth and constant.

Test: Filters - Question 13

In the below given configuration, L is connected as a filter across the R load.

The average ammeter current is

Detailed Solution for Test: Filters - Question 13

: I = Vo/R
Vo = 2Vm/π.

Test: Filters - Question 14

The current ripple factor (CRF) is the ratio of

Detailed Solution for Test: Filters - Question 14

CRF = Ir/Io.

Test: Filters - Question 15

In case of an L filter, the ripple current increases with

Detailed Solution for Test: Filters - Question 15

When the load is reduced the resistance R is increased & ripple current increases.

Test: Filters - Question 16

In case of a C filter, if R (load resistance) is increased

Detailed Solution for Test: Filters - Question 16

The time constant RC is increased therefore the ripple factor is reduced.

Test: Filters - Question 17

When a certain type of filter is connected across the R load, of a full wave bridge diode biased rectifier the following output current waveform is obtained.

The filter connected is most likely a

Detailed Solution for Test: Filters - Question 17

The above waveform is that of the output current. The peak per half cycle is on the right, hence it is more likely to be an L filter.

Test: Filters - Question 18

C filters are suitable for ___________ load resistances and L filters are suitable for _____________ load resistances.

Detailed Solution for Test: Filters - Question 18

In case of L filter, if R is lowered, the time constant (L/R) increases, therefore ripple factor reduces. In case of a C filter, the time constant RC is increased, therefore, ripple factor is reduced.

Test: Filters - Question 19

An LC filter will have ripple factor value___________ (For the same value of L & C)

Detailed Solution for Test: Filters - Question 19

Simply, an LC filter combines both the advantages of L and C filters.

Test: Filters - Question 20

In a single-phase full wave rectifier ___________ order harmonics are the most dominant

Detailed Solution for Test: Filters - Question 20

The output voltage is given by,
Vo = (2Vm/π) – (4Vm/3π)cos 2ωt – (4Vm/15π)cos 4ωt . . . .
Hence the other values after the second factor (4Vm/3π) become very very small hence they can be eliminated.

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