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TRIAC DIAC

Total questions: 60

Worksheet time: 32mins

Name
Class
Date
1.

A silicon controlled rectifier (SCR) is a

a)

Unijunction device

b)

Device with three junction

c)

Device with four junction

d)

None of the above

2.

A thyristor is basically

a)

PNPN device

b)

A combination of diac and triac

c)

A set of SCRs

d)

A set of SCR, diac and a triac

3.

An SCR has three terminals viz ……………

a)

Cathode, anode, gate

b)

Anode, cathode, grid

c)

Anode, cathode, drain

d)

None of the above

4.

In normal operation of an SCR, gate is ………..w.r.t. cathode

a)

Positive

b)

Negative

c)

At zero potential

d)

None of the above

5.

SCR is a ……………….. controlled device

a)

Voltage

b)

Current

c)

Voltage as well as current

d)

None of the above

6.

When an SCR is turned on, the voltage across it is about ……….

a)

zero

b)

1 volt

c)

10 volt

d)

0.1 volt

7.

An SCR is turned off when …………..

a)

Gate is reverse biased

b)

Gate voltage is reduced to zero

c)

Anode current is reduced to zero

d)

None of the above

8.

1) The Main Difference between SCR and SCS in?

a)

a)Gate Terminal

b)

b)Anode Terminal

c)

c)Cathode Terminal

d)

d)Base Terminal

9.

4) FET control?

a)

a) Voltage

b)

b) Current

c)

c) Greater Thermal Stability

d)

d) Both B and C

10.

5) IGBT is the second most widely used device after?

a)

a) SCR

b)

b) Diode

c)

c) BJT

d)

d) MOSFET

11.

A thyristor (SCR) is a

a)

P-N-P-N

device

b)

P-N-P device

c)

N-P-N device

d)

P-N device

12.

Which of the following terminals does not belong to the MOSFET?

a)

Drain

b)

Gate

c)

Base

d)

Source

13.

Above symbol is of----------------

a)

SCR

b)

Transistor

c)

IGBT

d)

MOSFET

14.

The DIAC is---------

a)

One terminal device

b)

Three-terminal device

c)

Four terminal device

d)

Two terminal device

15.

Above symbol is of--------

a)

DIAC

b)

GTO

c)

UJT

d)

TRIAC

16.

IGBT is a combination of Bipolar Junction Transistor (BJT) and

a)

SCR

b)

UJT

c)

FET

d)

MOSFET

17.

A TRIAC is_______

a)

3 terminal bidirectional switch

b)

3 terminal bilateral switch

c)

2 terminal switch

d)

2 terminal bilateral switch

18.

The GTO (gate turn-off thyristor) is a

a)

p-n-p-n device

b)

p-n-p device

c)

p-metal-n device

d)

p-n single junction device

19.

A Triac has three terminals viz ……………

a)

Drain, source, gate

b)

Anode 1, Anode 2 terminal

c)

Cathode, anode, gate

d)

Cathode 1, Cathode 2 and Gate

20.

Identify the structure

a)

TRIAC

b)

SCR

c)

DIAC

d)

GTO

21.

Which terminal does not belong to the SCR?

a)

Anode

b)

Gate

c)

Base

d)

Cathode

22.

A SCR is a ----------- terminal device

a)

2

b)

3

c)

4

d)

5

23.
a)

SCENZIATO

b)

SCIENZIATO

c)

SCIENZIATTO

24.

na slici je simbol za

a)

A. diak

b)

B. kondenzator

c)

C. tiristor

d)

D. transisitor PNP

e)

E. transistor NPN

25.

Gambar di atas merupakan simbol dari

a)

SCC (Silicon Controlled Switch)

b)

SCR (Silicon Controlled Rectifier)

c)

TRIAC (Triode Alternating Current)

d)

DIAC (Diode Alternating Current)

26.

Manakah yang merupakan rangkaian ekuivalen dari TRIAC

a)
b)
c)
27.

Where is Laos located?

a)

Next to Germany

b)

Next to Vietnam

c)

Above America

d)

In Africa

28.

When does Laos gain full independence?

a)

1954

b)

2001

c)

1600

d)

1995

29.

Who bombed Laos the most?

a)

America

b)

Laos

c)

Japan

d)

Vietnam

30.

Who was the first president of Laos

a)

George Washington

b)

Prince Souphanouvong

c)

Kaysone Phomvihane

d)

Donald Trump

31.

it's 1998, who is the president now?

a)

Souphanouvong

b)

Phomvihane

c)

Khamtay Siphandon

d)

Nam Theun

32.

When did King Savang Vathana abdicate the throne?

a)

1975

b)

1945

c)

1848

d)

2000

33.

2001 Who is elected president?

a)

Khamtay Siphandon

b)

Prince Souphanouvung

c)

Bill Clinton

34.

2. What is the capital of Laos?

a)

Naypyidaw

b)

Kuala Lumpur

c)

Vientiane

d)

Phnom Penh

35.

3. What is the language spoken in Laos?

a)

Burmese

b)

Lao

c)

Khmer

d)

Bahasa Malaysia

36.

6. What is the main export crop in Laos?

a)

rice

b)

corn

c)

coffee

d)

milk

37.

What is the capital city of Indonesia?

a)

Manila

b)

Jakarta

c)

Bangkok

d)

Naypyidaw

38.

What is the capital city of Cambodia?

a)

Vientiane

b)

Kuala Lumpur

c)

Manila

d)

Phnom Penh

39.

………………is the capital of Laos.

a)

Vientiane

b)

Naypyidaw

c)

Thai

d)

Hanoi

40.

What is the greeting of Vietnam?

a)

Xin Chao

b)

Hello

c)

So Sa Dai

d)

Som Bay Dee

41.

Above symbol is of----------------

a)

SCR

b)

Transistor

c)

IGBT

d)

MOSFET

42.

Above symbol is of--------

a)

DIAC

b)

GTO

c)

UJT

d)

TRIAC

43.

IGBT is a combination of Bipolar Junction Transistor (BJT) and

a)

SCR

b)

UJT

c)

FET

d)

MOSFET

44.

A TRIAC is_______

a)

3 terminal bidirectional switch

b)

3 terminal bilateral switch

c)

2 terminal switch

d)

2 terminal bilateral switch

45.

The GTO (gate turn-off thyristor) is a

a)

p-n-p-n device

b)

p-n-p device

c)

p-metal-n device

d)

p-n single junction device

46.

Identify the structure

a)

TRIAC

b)

SCR

c)

DIAC

d)

GTO

47.

The symbol shows is..............

a)

IGBT (Insulated Gate Bipolar Transistor)

b)

SCR (Silicon Controlled Rectifier)

c)

TRIAC (Triode Alternating Current)

d)

DIAC (Diode Alternating Current)

48.

Which of the following is the symbol of GTO-SCR?

a)
b)
c)
d)
49.

A TRIAC is a ___________ switch

a)

Unidirectional

b)

Bidirectional

c)

Either of the above

d)

None of the above

50.

The three terminals of the IGBT are

a)

base, emitter & collector

b)

gate, source & drain

c)

gate, emitter & collector

d)

base, source & drain

51.

IGBT full form?

a)

Insulated Gate Bipolar Transistor

b)

Isolated Gate Bipolar Transistor

c)

Intrensic Gate Bipolar Transistor

d)

Isolated Gate Bivalent Transistor

52.

A TRIAC is equivalent to two SCRs …………..

a)

In parallel

b)

In series

c)

In inverse-parallel

d)

Cascaded

53.

Identify this IV Characteristic curve

a)

SCR

b)

TRANSISTOR

c)

GTO

d)

TRIAC

54.

This symbol refer to

a)

Transistor UJT

b)

SCR

c)

Triacs

d)

Double SCR

55.

TRIAC can be triggered by either a positive or negative voltage being applied to its gate terminal.

a)

True

b)

False

56.

TRIAC is a four layer device that the current can flow in both directions

a)

True

b)

False

57.

The IGBT is a _______________ controlled device

a)

Current

b)

Voltage

58.

The TRIAC consists of _____________

a)

2 SCR

b)

2 BJT

c)

2 DIODE

d)

2 IGBT

59.

Which of the following is the symbol of IGBT?

a)
b)
c)
d)
60.

Which of the following is the symbol of SCR?

a)
b)
c)
d)

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