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Electrical Engineering (EE) Exam > Electrical Engineering (EE) Tests > Test: Thyristor - 1 - Electrical Engineering (EE) MCQ

Test: Thyristor - 1 - Electrical Engineering (EE) MCQ

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20 Questions MCQ Test - Test: Thyristor - 1

Test: Thyristor - 1 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Thyristor - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Thyristor - 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Thyristor - 1 below.

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Test: Thyristor - 1 - Question 1

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A thyristor (SCR) is a

A.
P-N-P device
B.
N-P-N device
C.
P-N-P-N device
D.
P-N device

Detailed Solution for Test: Thyristor - 1 - Question 1

An SCR (silicon controlled rectifier) is a four layer p-n-p-n type device.

Test: Thyristor - 1 - Question 2

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Which terminal does not belong to the SCR?

A.
Anode
B.
Gate
C.
Base
D.
Cathode

Detailed Solution for Test: Thyristor - 1 - Question 2

The SCR is having three terminals viz. anode, cathode and the gate.

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Test: Thyristor - 1 - Question 3

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An SCR is a

A.
four layer, four junction device
B.
four layer, three junction device
C.
four layer, two junction device
D.
three layer, single junction device

Detailed Solution for Test: Thyristor - 1 - Question 3

SCR is a four layer p-n-p-n device which forms three p-n junctions.

Test: Thyristor - 1 - Question 4

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Choose the false statement.

A.
SCR is a bidirectional device
B.
SCR is a controlled device
C.
In SCR the gate is the controlling terminal
D.
SCR are used for high-power applications

Detailed Solution for Test: Thyristor - 1 - Question 4

It is a unidirectional device, current only flows from anode to cathode.

Test: Thyristor - 1 - Question 5

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In the SCR structure the gate terminal is located

A.
near the anode terminal
B.
near the cathode terminal
C.
in between the anode & cathode terminal
D.
none of the mentioned

Detailed Solution for Test: Thyristor - 1 - Question 5

The gate is located near the cathode, because it allows fast turning on of the device when the gate signal is applied by forward basing the second junction.

Test: Thyristor - 1 - Question 6

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The static V-I curve for the SCR is plotted for

A.
Ia (anode current) vs Ig (gate current), Va (anode – cathode voltage) as a parameter
B.
Ia vs Va with Ig as a parameter
C.
Va vs Ig with Ia as a parameter
D.
Ig vs Vg with Ia as a parameter

Detailed Solution for Test: Thyristor - 1 - Question 6

The curve is plotted for Ia vs Va for different values of gate current Ig.

Test: Thyristor - 1 - Question 7

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If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

A.
all the junctions are reversed biased
B.
all the junctions are forward biased
C.
only the middle junction is forward biased
D.
only the middle junction is reversed biased

Detailed Solution for Test: Thyristor - 1 - Question 7

The device is in the reverse blocking state (3rd quadrant) & only the middle junction is forward biased whereas other two are reversed biased.

Test: Thyristor - 1 - Question 8

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For an SCR in the reverse blocking mode, (practically)

A.
leakage current does not flow
B.
leakage current flows from anode to cathode
C.
leakage current flows from cathode to anode
D.
leakage current flows from gate to anode

Detailed Solution for Test: Thyristor - 1 - Question 8

In the reverse blocking mode, the gate current is zero & a reverse voltage is applied at the cathode-anode.

Test: Thyristor - 1 - Question 9

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With the anode positive with respect to the cathode & the gate circuit open, the SCR is said to be in the

A.
reverse blocking mode
B.
reverse conduction mode
C.
forward blocking mode
D.
forward conduction mode

Detailed Solution for Test: Thyristor - 1 - Question 9

The SCR is in the forward blocking mode with its top and bottom junctions forward biased and the middle junction reversed biased.

Test: Thyristor - 1 - Question 10

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For an SCR in the forward blocking mode (practically)

A.
leakage current does not flow
B.
leakage current flows from anode to cathode
C.
leakage current flows from cathode to anode
D.
leakage current flows from gate to anode

Detailed Solution for Test: Thyristor - 1 - Question 10

In the forward blocking mode, the gate current is zero & only the middle J2 junction is reversed biased.

Test: Thyristor - 1 - Question 11

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The forward break over voltage is the

A.
anode-cathode voltage at which conduction starts with gate signal applied
B.
anode-cathode voltage at which conduction starts with no gate signal applied
C.
gate voltage at which conduction starts with no anode-cathode voltage
D.
gate voltage at which conduction starts with anode-cathode voltage applied

Detailed Solution for Test: Thyristor - 1 - Question 11

It is the forward voltage at which the middle junction breaks down without any gate signal and pushes the device into the conducting state.

Test: Thyristor - 1 - Question 12

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For a forward conducting SCR device, as the forward anode to cathode voltage is increased

A.
the device turns on at higher values of gate current
B.
the device turns on at lower values of gate current
C.
the forward impedance of the device goes on increasing
D.
the forward impedance of the device goes on decreasing

Detailed Solution for Test: Thyristor - 1 - Question 12

Higher the value of anode-cathode forward voltage, lower the gate requirements of the device. Also, the forward resistance of the device is always constant as long as the junction temperature is constant.

Test: Thyristor - 1 - Question 13

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A thyristor can be bought from the forward conduction mode to forward blocking mode by

A.
the dv/dt triggering method
B.
applying a negative gate signal
C.
applying a positive gate signal
D.
applying a reverse voltage across anode-cathode terminals

Detailed Solution for Test: Thyristor - 1 - Question 13

a) & c) are used to turn on the device, b) will damage the SCR.

Test: Thyristor - 1 - Question 14

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Usually the forward voltage triggering method is not used to turn-on the SCR because

A.
it increases losses
B.
it causes noise production
C.
it may damage the junction & destroy the device
D.
relatively it’s an inefficient method

Detailed Solution for Test: Thyristor - 1 - Question 14

In forward voltage triggering the middle junction breaks down without any gate signal and pushes the device into the conducting state. This method can permanently damage the J2 junction and make the device useless.

Test: Thyristor - 1 - Question 15

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Among the following, the most suitable method to turn on the SCR device is the

A.
gate triggering method
B.
dv/dt triggering method
C.
forward voltage triggering method
D.
temperature triggering method

Detailed Solution for Test: Thyristor - 1 - Question 15

d) & b) are unreliable methods, c) can permanently damage the SCR
Gate triggering is simple, reliable & most efficient.

Test: Thyristor - 1 - Question 16

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The forward break over voltage is maximum when

A.
Gate current = ∞
B.
Gate current = 0
C.
Gate current = -∞
D.
It is independent of gate current

Detailed Solution for Test: Thyristor - 1 - Question 16

Higher the value of anode-cathode forward voltage, lower the gate requirements of the device.

Test: Thyristor - 1 - Question 17

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For the SCR to remain in the ON (conducting) state

A.
gate signal is continuously required
B.
no continuous gate signal is required
C.
no forward anode-cathode voltage is required
D.
negative gate signal is continuously required

Detailed Solution for Test: Thyristor - 1 - Question 17

Unlike the transistor devices, once the SCR is turned on by the gate terminal, the gate terminal losses its control over the device.

Test: Thyristor - 1 - Question 18

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The value of anode current required to maintain the conduction of an SCR even though the gate signal is removed is called as the

A.
holding current
B.
latching current
C.
switching current
D.
peak anode current

Detailed Solution for Test: Thyristor - 1 - Question 18

It is the minimum anode current value required to maintain the conduction of an SCR even though the gate signal is removed. It is a very important parameter when employing an SCR in any circuit.

Test: Thyristor - 1 - Question 19

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In the reverse blocking mode the middle junction (J2) has the characteristics of that of a

A.
transistor
B.
capacitor
C.
inductor
D.
none of the mentioned

Detailed Solution for Test: Thyristor - 1 - Question 19

It is like a capacitor, as the dv/dt voltage triggering turns on the device. The charging current is given by,
I_C = C_jdV_a/dt.

Test: Thyristor - 1 - Question 20

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________ are semiconductor thyristor devices which can be turned-on by light of appropriate wavelengths.

A.
LGTOs
B.
LASERs
C.
MASERs
D.
LASCRs

Detailed Solution for Test: Thyristor - 1 - Question 20

LASCR stands for light activated SCRs, which can be turned on in made to conduct by firing appropriate light pulses at its gate region.

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