MA
Electronics Fundamentals Quiz
Test your knowledge in electronics and instrumentation with this comprehensive 48-question quiz. Designed for students, teachers, and professionals in the field, it covers various essential topics.
- Ideal Operational Amplifiers
- AC and DC Measurement Techniques
- Resistance and Strain Gauge Applications
In the Linear Variable Differential Transformer the two secondary voltages:
Are independent of the core position
Vary unequally depending on the core position
Vary equally depending on the core position
Are always in phase quadrature
Magnetic field strength, current density and electrical inductance are related to each other by:
The magnetic circuit law
The law of electrical conduction
The law of the connection between magnetic induction, magnetic field strength and magnetization
The law of transformation of energy into conductors
Where the bi-metallic strips are mostly used?
In industrial fans
In switching thermostats
In thermocouples
In RTDs
The circuit used for the measurement of small resistance variation dR is named:
Active Bridge
Schering Bridge
Passive Bridge
Instrumentation amplifier
The sampling frequency of an ADC is 700Hz. The input signal contains the following frequencies. Which frequency is not sampled correctly?
50Hz
85Hz
320Hz
500Hz
The load cell uses the principle of?
Voltage divider
Parallel ohmmeter
Unbalanced Wheatstone Bridge
Balanced Wheatstone Bridge
A 4-bit R/2R DAC has UR = 5V. What is the analog output for the 0101 input code?
0.1562V
3.125V
1.5625V
0.3125V
The fundamental constants of the quadrupole determined in the secondary idle test are:
A,C
B,D
A,C,D
A,D
What is the total resistance of a voltmeter on the 10V range when the meter movement is rated for 50uA of full-scale current?
10 KOhm
20 KOhm
200 KOhm
None of the above
The smallest change in a measured variable to which an instrument will respond is named?
Resolution
Precision
Sensitivity
Accuracy
A strain gauge with a resistance of 250 Ohm undergoes a change of 0.150 Ohm during a test. The strain is 1.5 * 10^-4. Then the gauge factor is:
100
3
2
4
The potentiometer in the figure is used to control the motor speed:
By acquiring a pwm signal
By generating a triangular signal
By generating a saw-tooth signal
By generating a pwm signal
A sinusoidal signal is measured with an oscilloscope that is set to 2V/div and 0.5ms/div. The following trace is produced on the screen. Which statement about the signal is correct?
The amplitude is 3.5V
The frequency is 0.5 kHz
The period is 1ms
The wavelength is 4 cm
For a normal distribution with a mean of 55 and a standard deviation of 4, what is the probability of selecting a score either greater that 56 or less then 51?
0.7574
0.0637
0.5600
0.24.26
A voltmeter has a resistance of G ohms and range V volts. The value of dropping resistance required in series to convert it into voltmeter of range V is
(n-1)G
G/n
G/(n-1)
NG
The AC bridge shown in the figure is balanced Z1 = 200<30, Z2 = 150<0 , Z3 = 250<-40. Z4 is:
120<70
187.5<-10
187.6<-70
333<-70
Which A/D converter has the lowest speed?
Flash type
Pipeline
Successive approximation
Dual slope integrating
Precision is a measure of
Is measured in watts
How close each measurement is to the true value
How good the actual measurement is
The number of significant figures that the results should be expressed to
How close each measurement is to one another
What is the moving part of a linear variable differential transformer?
Primary
Secondary
Diaphragm
Core
The time base signal in a CRO is a:
Rectangular waveform
High frequency sinusoidal wave form
High frequency sawtooth wave form
Square wave form
Ammeter shunts are usually equipped with:
Two connection terminals
Three connection terminals
Four connection terminals
Five connection terminals
The most common method for measurement of low resistance is:
Wheatstone bridge
Potentiometer method
Voltmeter-ammeter method
Kelvin's double bridge
The potentiometer enters in the category of:
Standard instruments
Indicating instruments
Comparison instruments
Calibrating instruments
Given a normal distribution with a mean of 80 and a standard deviation of 5, what percent of the value are between 70 and 90?
68
95
99
99.7
A normal distribution is completely described by:
Its mean
Its standard deviation
Its mean and standard deviation
None of the above
I(𝑡) = 2/(rad)2 * 𝑒^60°
A 3 1/2 digit voltmeter having a resolution of r = 100 mV can be used to measure maximum voltage of:
100 V
200 V
1000 V
5000 V
Н𝝶 = 1/𝜔𝝶 𝑖
Considering a population with a bimodal distribution. A sample of size 144 is taken randomly from this population. We find that the sample mean is 100 and the standard deviation is 24. The best estimate of the true mean value at the 92% confidence level is:
100+-3.5
100+-1.75
100+-0.96
100+-3.92
Forward phase-shifted magnitude by 𝜋/2
Two voltmeters have the same range R = 5V but the number of their divisions are N1 = 200, N2 = 150. In these conditions:
The voltmeters have the same resolution because of the same range
The resolution of the first is better
The resolution of the second is better
The resolution does not depend of N
If the full-scale deflection current of a multimeter is 50uA, it's sensitivity is:
20 KOhm
10 KOhm
50 KOhm
100 KOhm
Which one of the following is the best decision of accuracy?
It is the measure of consistency or reproducibility of measurements
It is the ratio of the change in the output signal to the change in input signal
It is smallest change in measurable input
It is the closeness with which an instrument reading approaches the true of the quantity being measured
Rectifier based electronic voltmeters indicate:
RMS values
Peak values
Mean value
None of these
The phase shifts between the phasors are different
At the oscilloscope, the volts per division control is used to:
Scale waveform vertically
Position a waveform vertically
Attenuate or amplify an input signal
Set the numbers of volts each division represents
Simple D to A conversion can be achieved using a weighted series of resistors and a single op amp configured in which of the following modes?
Voltage follower
Integrator
Summing amplifier
Differential amplifier
A certain brand of electric bulbs has an average life of 300 hours with a standard deviation of 25. A random of 100 bulbs is tested. What is the probability that the sample mean will be less than 295?
0.0548
0.1096
0.4452
0.0228
0.0793
The ideal voltmeter should have:
Infinite resistance
Finite resistance
Zero resistance
Infinite effect on the circuit being mesured
The closeness of a measurement to its true value is a measure of its:
Precision
Accuracy
Reproducitibility
Resolution
Which of the following properties should an ideal op-amp have?
Infinitely wide bandwidth, infinitely high output impedance and perfect linearity
High DC gain, low input reactance and perfect linearity
Infinitely high input impedance, perfect linearity and zero noise
Infinitely high gain, perfect linearity and zero input impedance
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