Multiple Choice Quiz: Active Circuits

When triggered by a negative pulse, the circuit shown produces:

(a) a single rectangular pulse with duration determined by R1 and C1
(b) a single rectangular pulse with duration determined by R2 and C2
(c) a series of rectangular pulses with duration determined by R2 and C2

Which one of the waveforms shows a typical waveform for the base-emitter voltage of an NPN transistor used in a simple common-emitter amplifier circuit operating from a 10V supply?

(a) Waveform (a) (b) Waveform (b) (c) Waveform (c)

In the circuit shown, which component provides DC isolation at the output?

(a) C1 (b) C2 (c) R2

The figure shows a simple DC power supply. Which one of the following gives the approximate output voltage with no load connected?

(a) 6V
(b) 12V
(c) 17V

In the circuit shown, which components act as a filter to improve smoothing?

(a) T1 and D1
(b) C1 and R1
(c) R1 and C2

In the circuit shown, IC1 is a 555 timer connected in:

(a) astable mode
(b) bistable mode
(c) monostable mode

The amplitude of the pulse generated by the circuit shown will be:

(a) about 12V
(b) exactly 6V
(c) the same as the trigger input

In the circuit shown, which one of the following gives the voltage gain?

(a) R2 - R1
(b) - R2/R1
(c) 1 + (R2/R1)

In the circuit shown, the feature 'X' is:

(a) the inverting input
(b) the non-inverting input
(c) the positive supply input

Which one of the following gives the voltage gain of the circuit shown?

(a) 2 (inverting)
(b) 3 (inverting)
(c) 30 (inverting)

In the circuit shown, which one of the following gives the voltage gain?

(a) R1 - R2
(b) R2/R1
(c) 1 + (R2/R1)

In the power supply circuit shown:

(a) D1 to D4 form a half-wave rectifier
(b) D1 to D4 form a bridge rectifier
(c) D1 to D4 form a diode stabilizer

In the circuit shown, the feature 'X' is:

(a) the inverting input
(b) the non-inverting input
(c) the negative supply input

In the circuit shown, if V_IN = 1.5V, which one of the following gives V_OUT?

(a) -3V
(b) 3V
(c) 4.5V

Which one of the waveforms shows a typical waveform for the collector-emitter voltage of an NPN transistor used in a simple common-emitter amplifier circuit operating from a 10V supply?

(a) Waveform (a)
(b) Waveform (b)
(c) Waveform (c)

In the circuit shown, the output voltage will consist of:

(a) a steady DC voltage of about 12V
(b) a steady DC voltage of about 17V
(c) a series of half-cycle pulses

The figure shows a simple DC power supply. Which one of the following gives the approximate output voltage with no load connected?

(a) 4.5V
(b) 9V
(c) 11.5V

The device shown is:

(a) a timer
(b) a logic gate
(c) an operational amplifier

The circuit shows a power supply based on a:

(a) half-wave rectifier
(b) full-wave rectifier
(c) bridge rectifier

The figure shows a simple DC power supply. Which one of the following gives the approximate output voltage with no load connected?

(a) 4.5V
(b) 9V
(c) 11.5V

In the circuit shown, which component provides base bias current?

(a) C1
(b) R1
(c) R2

Which one of the waveforms shows a typical waveform for the base-emitter voltage of an NPN transistor used in a simple common-emitter amplifier circuit operating from a 10V supply?

(a) Waveform (a)
(b) Waveform (b)
(c) Waveform (c)