1
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
The truth of a monoshot shown in the figure is given in the table below: GATE EE 2008 Analog Electronics - 555 Timer Question 1 English 1

Two monoshots, one positive edge triggered and other negative edge triggered, are connected as shown in the figure. The pulse widths of the two monoshot options, $${Q_1}$$ and $${Q_2}$$ are $${T_{O{N_1}}}$$ and $${T_{O{N_2}}}$$ respectively.

GATE EE 2008 Analog Electronics - 555 Timer Question 1 English 2

The frequency and the duty cycle of the signal at $${Q_1}$$ will respectively be

GATE EE 2008 Analog Electronics - 555 Timer Question 1 English 3
A
$$F = {1 \over {{T_{ON1}} + {T_{ON2}}}},{\mkern 1mu} D = {{{T_{O{N_1}}}} \over {{T_{O{N_1}}} + {T_{O{N_2}}}}}$$
B
$$F = {1 \over {{T_{O{N_1}}} + {T_{O{N_2}}}}},{\mkern 1mu} D = {{{T_{O{N_2}}}} \over {{T_{O{N_1}}} + {T_{O{N_2}}}}}$$
C
$$F = {1 \over {{T_{O{N_1}}}}},{\mkern 1mu} D = {{{T_{O{N_1}}}} \over {{T_{O{N_1}}} + {T_{O{N_2}}}}}$$
D
$$F = {1 \over {{T_{O{N_2}}}}},{\mkern 1mu} D = {{{T_{O{N_1}}}} \over {{T_{O{N_1}}} + {T_{O{N_2}}}}}$$
2
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
$$IC$$ $$555$$ in the adjacent figure is configured as an Astable multivibrator. It is enabled to oscillator at $$t=0$$ by applying a high input to pin $$4.$$ The pin description is $$1$$ and $$8$$ $$-$$supply; $$2-$$trigger; $$4-$$reset; $$6$$-threshold; $$7$$-discharge. The wave form appearing across the capacitor starting from $$t=0$$ as observed on the storage $$CRO$$ is GATE EE 2007 Analog Electronics - 555 Timer Question 2 English
A
GATE EE 2007 Analog Electronics - 555 Timer Question 2 English Option 1
B
GATE EE 2007 Analog Electronics - 555 Timer Question 2 English Option 2
C
GATE EE 2007 Analog Electronics - 555 Timer Question 2 English Option 3
D
GATE EE 2007 Analog Electronics - 555 Timer Question 2 English Option 4
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
The circuit of fig shows a $$555$$ Timer $$IC$$ connected as an Astable multivibrator. The value of the capacitor $$C$$ is $$10$$ $$nF.$$ The values of the resistors $${R_A}$$ and $${R_B}$$ for a frequency of $$10$$ $$kHz$$ and a duty cycle of $$0.75$$ for the output voltage waveform are GATE EE 2003 Analog Electronics - 555 Timer Question 3 English
A
$${R_A} = 3.62\,k\Omega ,\,\,{R_B} = 3.62\,k\Omega $$
B
$${R_A} = 3.62\,k\Omega ,\,\,{R_B} = 7.25\,k\Omega $$
C
$${R_A} = 7.25\,k\Omega ,\,\,{R_B} = 3.62\,k\Omega $$
D
$${R_A} = 7.25\,k\Omega ,\,\,{R_B} = 7.25\,k\Omega $$
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