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WorksheetsRevision: Topic 19,20,21Electronics
Total questions: 35
Worksheet time: 20mins
A sensing device is also called
transistor
thermistor
sensor
transducer
Change in cross sectional area of a wire also change its
current
voltage
resistance
magnetic effect
A light dependent resistor is made up of
low resistance semiconductor
high resistance semiconductor
high resistance conductor
low resistance metal
In potential dividers, the output voltage depends upon the
single resistor
relative values of all resistors
current
temperature
Which component matches this symbol?
LDR
LED
Diode
Bulb
Which component matches this symbol?
fuse
LDR
thermistor
LED
This is a graph for which component?
LDR
Thermistor
Diode
Resistor
Filament lamp
As the temperature increases, the resistance
increases
decreases
In a potential divider circuit there must be
At least 1 resistor
At least 2 resistors
A switch
A thermistor
Here, we have a 12 V battery. There are 2 resistors in series. The voltmeter measuring across one resistor measures 8V. Therefore, how many volts would the other resistor get?
0v
4v
8v
12v
In this circuit, how will the amount of voltage the thermistor gets change as the temperature of the circuit goes up. Hint- First consider how it's resistance changes, and it's volts will change the same way!
It will get more volts
The volts it gets will not change
It will get less volts
The circuit will stop working
A
B
C
D
A
B
C
D
Choose the correct answer of Op-Amp properties.
Infinite Output Impedance
Low Input Impedance
Infinite Open-Loop Gain
Zero Bandwidth
Current cannot flow to ground through …….
a mechanical ground
an a.c. ground
a virtual ground
an ordinary ground
The input stage of an Op-amp is usually a ……….
differential amplifier
class B push-pull amplifier
CE amplifier
swamped amplifier
Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is
1
2000
80 dB
100,000
For an Op-amp with negative feedback, the output is ……
equal to the input
increased
fed back to the inverting input
fed back to the noninverting input
The use of negative feedback ………
reduces the voltage gain of an Op-amp
makes the Op-amp oscillate
makes linear operation possible
answers (1) and (2)
Negative feedback ………..
increases the input and output impedances
increases the input impedance and bandwidth
decreases the output impedance and bandwidth
does not affect impedance or bandwidth
The Op-amp can amplify
a.c. signals only
d.c. signals only
both a.c. and d.c. signals
neither d.c. nor a.c. signals
Noninverting amplifier is
source connected to V+
source connected to V-
source not connected
Inverting amplifier is
Source connected to V+
source connected to V-
source not connected anywhere
180phase shift with respect to input waveform is
Inverting amplifier
Non-inverting amplifier
pushpull amplifier
For the OP-AMP given in figure, the voltage gain will be:
-R2/R1
-R3/R1
-(R2+R3)/R1
-(R2||R3)/R1
Assume that the op-amp of the figure is ideal. If Vi is a triangular wave, then V0 will be
triangular wave
square wave
parabolic wave
sine wave
Identify the circuit
Inverting amplifier
voltage follower
Differential amplifier
Non inverting amplifier
Determine the output voltage for this circuit with a sinusoidal input of 2.5 mV.
–0.25 V
–0.125 V
0.25 V
0.125 V
What is the Open Loop Gain of an IDEAL amplifier?
zero
1
1 000
a million
infinite open loop gain
This is a COMPARATOR circuit made from an ideal operational amplifier. If V+ = 6V and V- = 5V, the output voltage will be...
Vout = +1V
Vout = +12V
Vout = 0V
Vout = -12V
Which one of these circuits is an Inverting Amplifier?
Which of these circuits is a Non-Inverting Amplifier?
What is the voltage gain of this amplifier?
+5
+6
-5
-6
An amplifier is connected to a ±9V power supply. The output signal is suffering from clipping distortion due to saturation. There are THREE things that can be done to reduce this effect, but what are they?
Decrease input voltage
Reduce frequency of signal
Decrease voltage gain
Increase power supply voltage
Increase feedback resistor value
