WorksheetsAE-LAB(ECE-224) WTP-2 (30-10-20)
Total questions: 30
Worksheet time: 19mins
The op amp can amplify
AC signals only
Both ac and dc signals
DC signals only
Neither ac not dc signals
The input offset current equals the
Average of the two base currents
Collector current divided by current gain
Difference between the two base-emitter voltages
Difference between the two base currents
The input stage of an op amp is usually a
Class B push-pull amplifier
CE amplifier
Differential amp
Swamped amplifier
The input offset current is usually
Equal to zero
Less than the input bias current
Less than the input offset voltage
Unimportant when a base resistor is used
At the unity-gain frequency, the open-loop voltage gain is
Very large
AV(mid)
1
0
An op amp has a voltage gain of 200,000. If the output voltage is 10 V, the input voltage is
5 μV
4 μV
2 μV
1 μV
The voltage follower has a
Small open-loop voltage gain
Closed-loop bandwidth of zero
Large closed-loop output impedance
Closed-loop voltage gain of unity
The input signal for an instrumentation amplifier usually comes from
An inverting amplifier
A resistor
A wheat- stone bridge
A differential amplifier
If ADM = 3500 and ACM = 0.35, the CMRR is ……….
1225
10,000
80 dB
both (a) and (c)
The output of a particular Op-amp increases 8V in 12μs. The slew rate is …….
90 V/μs
0.67 V/μs
1.5 V/μs
none of these
A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is ………
100,000
1000
101
100
A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain ……..
doubles
remains at 25
increases slightly
drops to 12.5
Determine the output from the inverting op amp circuit
180o in phase with input signal
180o out of phase with input signal
Same as that of input signal
None of the above
Find the input voltage of an ideal op-amp. It’s one of the inputs and output voltages are 2v and 12v. (Gain=3)
8v
2v
-2v
4v
Op-amps used as high- and low-pass filter circuits employ which configuration?
Inverting
non-inverting
comparator
open loop circuit
An astable multivibrator is also known as a:
one-shot multivibrator
free-running multivibrator
bistable multivibrator
free-running multivibrator
If the input to a comparator is a
sine wave, the output is a:
sine wave
Rectangular Wave
sawtooth wave
ramp voltage
What three sub-circuits does a phase locked loop (PLL) consist of?
phase comparator, comparator, and VCO
phase comparator, low-pass filter,
and VCO
phase comparator, bandpass filter,
and VCO
phase comparator, bandpass filter, and demodulator
The major difference between ground and virtual ground is that virtual ground is only a:
voltage reference
current reference
power reference
difference reference
If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
Common-mode
Single ended
Double-ended
Noninverting mode
In a PLL, to obtain lock, the signal frequency must:
come within the lock range
come within the capture range
be less than the capture frequency
be greater than the capture frequency
An ideal amplifier should have:
high input current
high output impedance
moderate gain
zero offset
A circuit that uses an amplifier with passive filter elements is called a(n):
signal generator
relaxation oscillator
active filter
differential amplifier
The input offset current equals the
average of two base currents
difference between two base currents
difference between two base-emitter voltages
collector current divided by the current gain
Find the output voltage of the integrator
Vo = (R/CF)×t∫0 Vindt+C
Vo = (CF/R)×t∫0 Vindt+C
Vo = -(1/R×CF)×t∫0 Vindt+C
Vo = (R×CF)×t∫0 Vindt+C
Why an integrator cannot be made using low pass RC circuit?
It require large value of R and small value of C
It require large value of R and C
It require small value of R and C
It require large value of C and small value of R
If the input is a Square pulse, the output of an differentiator is a
Spikes
Sine Wave
Sine wave
Rectangular Wave
Name the filter that has two stop bands?
Band-reject filter
High pass filter
Band-pass filter
Low pass filter
A 10-bit D/A converter have an output range from 0-9v. Calculate the output voltage produced when the input binary number is 1110001010.
±7.96v
7.96v
-7.96v
None of the above
For a monostable multivibrator, Calculate the value of C if R = 120kΩ and the time delay T = 1000ms.
0.9µF
7.5µF
1.32µF
2.49µF
