ATT Week 6 Questions and Answers 100% Correct | New
Update 2025
Question 1
The transistors in a multivibrator are biased __________.
A) so that they are always in active region
B) so that they are either in cutoff or saturation
C) to operate in class A mode
D) to operate in class B mode
E) to operate in class C mode
Correct Answer: B) so that they are either in cutoff or saturation
Rationale: The transistor in a multivibrator are biased so that they
are either in cutoff or saturation, acting as electronic switches.
Question 2
How many transistors do multivibrators typically have?
A) 1
B) 2
C) 3
D) 4
E) More than 4
Correct Answer: B) 2
Rationale: Multivibrators typically consist of two transistors.
Question 3
The purpose of a multivibrator is to __________.
A) convert AC energy to DC energy
B) amplify AC signals
C) convert DC energy to square wave energy
D) regulate voltage
E) filter out noise
Correct Answer: C) convert DC energy to square wave energy
Rationale: The purpose of a multivibrator is to convert DC energy to
square wave energy, generating oscillating waveforms.
,Question 4
When a transistor in a multivibrator is ON, the output voltage at its collector
is __________.
A) HIGH
B) LOW
C) fluctuating
D) indeterminate
E) zero
Correct Answer: B) LOW
Rationale: When transistors in a multivibrator is on, the output
voltage is LOW, typically near saturation voltage.
Question 5
Triggered multivibrators generate a square wave output __________.
A) continuously
B) only when an external input is applied
C) at a fixed frequency
D) independently of external inputs
E) at random intervals
Correct Answer: B) only when an external input is applied.
Rationale: Triggered multivibrators generate a square wave output
only when an external input is applied, as they are not free-running.
Question 6
In monostable multivibrators, the output of Q2 is fed back through the
__________.
A) capacitor to the input of Q1
B) resistor to the input of Q1
C) diode to the input of Q1
D) inductor to the input of Q1
E) transistor Q1
Correct Answer: B) resistor to the input of Q1
,Rationale: In monostable multivibrators, the output of Q2 is fed back
through the resistor to the input of Q1.
Question 7
In multivibrator feedback circuits, how are the transistors connected?
A) Q1 output to Q1 input and Q2 output to Q2 input.
B) Q1 output to Q2 input and Q2 output to Q1 input.
C) Q1 output to Q2 output and Q2 input to Q1 input.
D) Both Q1 and Q2 outputs are connected to a common input.
E) Both Q1 and Q2 inputs are connected to a common output.
Correct Answer: B) Q1 output to Q2 input and Q2 output to Q1 input
Rationale: In multivibrator feedback circuits, the transistors are
cross-coupled: Q1 output is connected to Q2 input, and Q2 output is
connected to Q1 input.
Question 8
Multivibrator frequency is primarily determined by __________.
A) the supply voltage
B) the load connected to the output
C) the components in the feedback circuit
D) the transistor type
E) the ambient temperature
Correct Answer: C) the components in the feedback circuit.
Rationale: Multivibrator frequency is determined by the components
in the feedback circuit, typically RC (resistor-capacitor) components.
Question 9
In an astable multivibrator, what determines which transistor turns ON when
power is first applied?
A) The transistor with the highest gain.
B) The transistor that conducts first due to slight imbalances.
C) The transistor with the smallest base resistor.
D) The transistor with the largest capacitor.
, E) It is always Q1.
Correct Answer: B) The transistor that conducts first
Rationale: In an astable multivibrator, the transistor that conducts
first (due to slight inherent imbalances) determines which one turns
ON when power is first applied.
Question 10
In an astable multivibrator, if Q1 is ON, Q2 is turned ON by ___________.
A) C2 discharging
B) C1 charging
C) R1
D) R2
E) The collector voltage of Q1
Correct Answer: B) C1 Charging
Rationale: In an astable multivibrator, when Q1 is ON (Q2 is OFF),
capacitor C1 charges through R3 towards VCC. When the voltage
across C1 reaches a certain point, it turns Q2 ON.
Question 11
When Q2 turns ON, Q1 is turned OFF by __________.
A) C1 charging
B) C2 discharging
C) R4
D) R3
E) The base bias of Q2
Correct Answer: B) C2 Discharging
Rationale: When Q2 turns ON (Q1 is ON), C2 discharges through R4
and the now ON Q2, driving Q1's base negative, turning Q1 OFF.
Question 12
In this astable multivibrator, what component is the collector load resistor for
Q2?
A) R1
Update 2025
Question 1
The transistors in a multivibrator are biased __________.
A) so that they are always in active region
B) so that they are either in cutoff or saturation
C) to operate in class A mode
D) to operate in class B mode
E) to operate in class C mode
Correct Answer: B) so that they are either in cutoff or saturation
Rationale: The transistor in a multivibrator are biased so that they
are either in cutoff or saturation, acting as electronic switches.
Question 2
How many transistors do multivibrators typically have?
A) 1
B) 2
C) 3
D) 4
E) More than 4
Correct Answer: B) 2
Rationale: Multivibrators typically consist of two transistors.
Question 3
The purpose of a multivibrator is to __________.
A) convert AC energy to DC energy
B) amplify AC signals
C) convert DC energy to square wave energy
D) regulate voltage
E) filter out noise
Correct Answer: C) convert DC energy to square wave energy
Rationale: The purpose of a multivibrator is to convert DC energy to
square wave energy, generating oscillating waveforms.
,Question 4
When a transistor in a multivibrator is ON, the output voltage at its collector
is __________.
A) HIGH
B) LOW
C) fluctuating
D) indeterminate
E) zero
Correct Answer: B) LOW
Rationale: When transistors in a multivibrator is on, the output
voltage is LOW, typically near saturation voltage.
Question 5
Triggered multivibrators generate a square wave output __________.
A) continuously
B) only when an external input is applied
C) at a fixed frequency
D) independently of external inputs
E) at random intervals
Correct Answer: B) only when an external input is applied.
Rationale: Triggered multivibrators generate a square wave output
only when an external input is applied, as they are not free-running.
Question 6
In monostable multivibrators, the output of Q2 is fed back through the
__________.
A) capacitor to the input of Q1
B) resistor to the input of Q1
C) diode to the input of Q1
D) inductor to the input of Q1
E) transistor Q1
Correct Answer: B) resistor to the input of Q1
,Rationale: In monostable multivibrators, the output of Q2 is fed back
through the resistor to the input of Q1.
Question 7
In multivibrator feedback circuits, how are the transistors connected?
A) Q1 output to Q1 input and Q2 output to Q2 input.
B) Q1 output to Q2 input and Q2 output to Q1 input.
C) Q1 output to Q2 output and Q2 input to Q1 input.
D) Both Q1 and Q2 outputs are connected to a common input.
E) Both Q1 and Q2 inputs are connected to a common output.
Correct Answer: B) Q1 output to Q2 input and Q2 output to Q1 input
Rationale: In multivibrator feedback circuits, the transistors are
cross-coupled: Q1 output is connected to Q2 input, and Q2 output is
connected to Q1 input.
Question 8
Multivibrator frequency is primarily determined by __________.
A) the supply voltage
B) the load connected to the output
C) the components in the feedback circuit
D) the transistor type
E) the ambient temperature
Correct Answer: C) the components in the feedback circuit.
Rationale: Multivibrator frequency is determined by the components
in the feedback circuit, typically RC (resistor-capacitor) components.
Question 9
In an astable multivibrator, what determines which transistor turns ON when
power is first applied?
A) The transistor with the highest gain.
B) The transistor that conducts first due to slight imbalances.
C) The transistor with the smallest base resistor.
D) The transistor with the largest capacitor.
, E) It is always Q1.
Correct Answer: B) The transistor that conducts first
Rationale: In an astable multivibrator, the transistor that conducts
first (due to slight inherent imbalances) determines which one turns
ON when power is first applied.
Question 10
In an astable multivibrator, if Q1 is ON, Q2 is turned ON by ___________.
A) C2 discharging
B) C1 charging
C) R1
D) R2
E) The collector voltage of Q1
Correct Answer: B) C1 Charging
Rationale: In an astable multivibrator, when Q1 is ON (Q2 is OFF),
capacitor C1 charges through R3 towards VCC. When the voltage
across C1 reaches a certain point, it turns Q2 ON.
Question 11
When Q2 turns ON, Q1 is turned OFF by __________.
A) C1 charging
B) C2 discharging
C) R4
D) R3
E) The base bias of Q2
Correct Answer: B) C2 Discharging
Rationale: When Q2 turns ON (Q1 is ON), C2 discharges through R4
and the now ON Q2, driving Q1's base negative, turning Q1 OFF.
Question 12
In this astable multivibrator, what component is the collector load resistor for
Q2?
A) R1
