1. . The 555 Timer IC got its name from the three _______ resistors that are used in its voltage divider network:
(A) 5Ω
(B) 5KΩ
(C) 5MΩ
(D) 5TΩ
2. . The 555 Timer IC is a _______ pin mini Dual-Inline Package:
(A) 1
(B) 2
(C) 4
(D) 8
3. . 555 Timer mainly useful for generating ___________ wave forms:
(A) Sinusoidal
(B) Cosinusoidal
(C) Non-sinusoidal
(D) Non-cosinusoidal
4. . The pictorial representation showing the internal details of a 555 timer is known as:
(A) Simple diagram
(B) Functional diagram
(C) Exceptional diagram
(D) All of the above
5. . The functional diagram of a 555 Timer IC consists of ___ comparators:
(A) 2
(B) 3
(C) 4
(D) 5
6. . 555 Timer IC is useful for generating accurate time delays and oscillations:
(A) True
(B) False
(C) Both a & b
(D) None of these
7. . Pin 8 of 555 IC consists of:
(A) Voltage Supply
(B) Ground
(C) Output
(D) Discharge
8. . Pin 1 of 555 time IC has:
(A) Ground
(B) Trigger
(C) Discharge
(D) Output
9. . A 555 timer in monostable application mode can be used for:
(A) Pulse position modulation
(B) Frequency shift keying
(C) Speed control and measurement
(D) Digital phase detector
10. . This 555 Timer IC can be operated with a DC supply of +5V to +18V:
(A) Yes
(B) No
(C) Can be yes or No
(D) None of these
11. . In 555 timer, reset is present at pin:
(A) 1
(B) 4
(C) 8
(D) 2
12. . Astable multivibrator is:
(A) A square wave clock
(B) Equivalent to a flip flop
(C) A one shot multivibrator
(D) None of these
13. . Determine the time period of a monostable 555 multivibrator:
(A) T = 0.33 RC
(B) T = 1.1 RC
(C) T = 3 RC
(D) T = RC
14. . A multivibrator is a circuit which generates:
(A) Square wave
(B) Sine wave
(C) Triangular wave
(D) Rectangular wave
15. . Most popular IC used in timing circuits:
(A) 555
(B) 741
(C) 7400
(D) All of these
16. . A monostable multivibrator has R = 120kΩ and the time delay T = 1000ms, calculate the value of C:
(A) 0.9µF
(B) 1.32µF
(C) 7.5µF
(D) 2.49µF
17. . Free running frequency of Astable multivibrator:
(A) f = 1.45 / (RA + RB)C
(B) f = 1.45 / (RA + 2RB)C
(C) f = 1.45 C / (2RA + 2RB)
(D) f = 1.45 RA / (RA + RB)
18. . What is the duty cycle of the output of an astable multivibrator?
(A) 50%
(B) 55%
(C) 75%
(D) 100%
19. . Which of the following multivibrator is called the flip-flop:
(A) Astable multivibrator
(B) Monostable multivibrator
(C) Bi-stable multivibrator
(D) (a) or (b)
20. . A monostable multivibrator is also referred as:
(A) One shot
(B) Two shot
(C) Three shot
(D) Four shot