Data Acquisition System ( Electrical Measurements ) MCQs – Electrical Measurements MCQs
Latest Electrical Measurements MCQs
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Electrical Measurements MCQs – Data Acquisition System ( Electrical Measurements ) MCQs
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Objectives of Data Acquisition System
1. What is a data acquisition system?
a) system used for data processing, conversion and transmission
b) accepts data as an input
c) removes noise
d) boosts the signal
Answer: a
Explanation: A data acquisition system basically is used for the processing of data. It is also used for data conversion, data transmission and storage of data.
2. A typical data acquisition system consists of __________
a) op amps
b) sensors
c) rectifiers
d) transistors
Answer: b
Explanation: Data acquisition system consists of sensors. It also consists of suitable signal conditioners, data converters, data processors, data handlers, storage and display systems.
3. The data acquisition system implies input data collection __________
a) in mixed signal form
b) in analog form
c) in digital form
d) in the form of binary codes
Answer: c
Explanation: In a data acquisition system, input data is collected in the form of digital signals. The digital signals are collected in a fast, economic, reliable and accurate manner.
4. Data measurement systems are __________
a) not flexible
b) rigid
c) less flexible
d) more flexible
Answer: d
Explanation: The data acquisition system are more flexible and easily programmable nowadays as a result of development in the automation field.
5. Modern electronic instrumentation system is not complex.
a) True
b) False
Answer: a
Explanation: In spite of significant development in the field of electronic instrumentation systems with the advent of op amps, data converters, multiplexers, microprocessors and microcontrollers, they are not complicated.
6. The data acquisition system can have any speed.
a) True
b) False
Answer: b
Explanation: A data acquisition system must acquire the required speed at the correct time. It must also use the data efficiently to detect the status of the plant.
7. A data acquisition system provides __________
a) partial communication
b) ineffective communication
c) effective communication
d) complete communication
Answer: c
Explanation: The data acquisition system must be able to provide proper human communication to minimize the unit availability and maximize the unit output at a lower cost.
8. Data acquisition system can be used in __________
a) 10 ways
b) 8 ways
c) 4 ways
d) 2 ways
Answer: d
Explanation: A data acquisition system can be used to measure and record the signals in two ways. In the first method the signal can be directly measured from electrical quantities such as a.c., d.c. voltage or current. In the second case the signal originates from transducers such as pressure transducer, thermocouple, etc.
9. Data acquisition system is mainly classified into __________
a) 2 types
b) 4 types
c) 6 types
d) 8 types
Answer: a
Explanation: A data acquisition system is basically classified into two main types. They are analog and digital. While the analog data system deals with signals having analog input signals the digital data system consists of input signals in digital form.
Analog Data Acquisition System
1. Transducer is used to convert a _________
a) physical quantity into an electrical signal
b) electrical signal into a physical quantity
c) physical quantity into a mechanical quantity
d) physical quantity into a chemical quantity
Answer: a
Explanation: Transducer forms one of the most important components of an analog data acquisition system. It converts a physical quantity into an electrical signal. Strain gauge, thermocouples, piezoelectric devices are the most widely used transducers.
2. Transducer produces a _________
a) proportional current
b) proportional voltage
c) proportional resistance
d) proportional power
Answer: b
Explanation: A transducer generates a voltage proportional to the physical quantity that is being measured. The voltage output from a transducer forms the input to a data acquisition system.
3. Sensors produce frequency which is counted by _________
a) a chemical counter
b) a mechanical counter
c) an electronic counter
d) a basic counter
Answer: c
Explanation: Transducers consist of special sensors used to produce frequency that can be counted by means of an electronic counter. This frequency forms an integral part of the frequency measured.
4. Signal conditioner is used for _________
a) attenuating the voltage
b) maintaining a constant voltage
c) keeping the voltage zero
d) boosting the voltage
Answer: d
Explanation: Signal conditioner is an important part of an analog data acquisition system. A signal conditioner converts the output voltage to the desired form which is accepted by the next stage.
5. A multiplexer is used for _________
a) accepting multiple inputs
b) accepting single input
c) accepting multiple outputs
d) accepting single output
Answer: a
Explanation: A multiplexer forms an important constituent of an analog data acquisition system. It takes multiple analog inputs. By making use of a multiplexer many quantities can be transmitted.
6. Multiplexers are used when the distance between source and destination is less.
a) True
b) False
Answer: b
Explanation: Generally multiplexers are made use of only when the distance of separation between the transmitting end and the receiving end is more.
7. Output signal is captured using _________
a) CRO
b) plotter
c) recorder
d) voltmeter
Answer: c
Explanation: In an analog data acquisition system, the output signal is recorded by means of an analog recorder. It includes the likes of strip chart recorder, magnetic tape recorder, etc.
8. Analog computers have __________
a) zero cost
b) intermediate cost
c) more cost
d) less cost
Answer: d
Explanation: The accuracy of digital computers is more than that of analog computers. Analog computers are widely used when compared to digital computers because of their less cost.
9. Before and after each test, calibration is carried out.
a) True
b) False
Answer: a
Explanation: In an analog data acquisition system, calibration carried out before each test is known as pre-calibration. The test carried out after calibration is known as post-calibration.
Digital Data Acquisition System
1. A/D converter is used for __________
a) converting analog to digital
b) converting digital to analog
c) converting digital to mixed signal mode
d) converting analog to mixed signal mode
Answer: a
Explanation: In a digital data acquisition system, an A/D converter is used for the purpose of converting analog signals to digital.
2. Output of A/D converter is _________
a) given to an analog display
b) given to a digital display
c) given to a CRO
d) given to a voltmeter
Answer: b
Explanation: Output from the analog to digital converter is given to a digital display device or to a digital recorder for the purpose of displaying or recording.
3. What are auxiliary equipments?
a) equipment
b) guard rings
c) devices
d) voltage source
Answer: c
Explanation: Auxiliary equipments are basically devices used for system programming functions and digital data processing applications.
4. What is the main function of auxiliary equipment?
a) unit step response
b) ramp response
c) non-linear response
d) linear response
Answer: d
Explanation: The typical functions of auxiliary equipments include linearization and limit compression for the input signals. Individual instruments or a digital computer is used to perform these functions.
5. What is a digital recorder?
a) records digital data
b) records analog data
c) does not record data
d) records both analog and digital data
Answer: a
Explanation: A digital recorder is used for the purpose of recording the digital data. Punched cards, magnetic tape recorders, type written pages, etc make use of digital recorders.
6. Data acquisition systems are not widely used.
a) True
b) False
Answer: b
Explanation: In digital recorders, data acquisition systems are used widely in industries, space applications, medical and telephony.
7. For lower accuracies _________
a) digital acquisition system is used
b) both digital and analog acquisition systems are used
c) analog acquisition system is used
d) mechanical data acquisition system is used
Answer: c
Explanation: When low values of accuracy is required, analog data acquisition system is used. This includes a wide frequency bandwidth as well.
8. Digital acquisition systems are used when _________
a) bandwidth is high
b) bandwidth is medium
c) bandwidth is zero
d) bandwidth is low
Answer: d
Explanation: When the bandwidth required is low, usually digital acquisition systems are made use of. For higher accuracy and lower per channel cost, digital data acquisition systems are used.
Single Channel Data Acquisition System
1. A single channel data system consists of a signal conditioner, A/D converter and a buffer.
a) True
b) False
Answer: a
Explanation: The single channel data acquisition system consists of a signal conditioner, an analog to digital converter and a buffer circuitry.
2. A/D conversion rate is __________
a) variable
b) predefined
c) zero
d) constant
Answer: b
Explanation: In a single channel data acquisition system, the conversion rate of an analog to digital converter is predefined. A/D converter performs the conversions at a pre-determined rate.
3. The buffer output is ________
a) analog
b) zero
c) digital
d) mixed mode
Answer: c
Explanation: In a single channel data acquisition system, the output of the buffer circuitry is digital in nature. It is stored in a digital computer or a storage device or sometimes even a printer.
4. Which is the best example of a single channel data acquisition system?
a) CPM
b) BPM
c) APM
d) DPM
Answer: d
Explanation: A digital panel meter usually abbreviated as DPM is the best example of a single channel data acquisition system.
5. Digital outputs are obtained from _____________
a) A/D converter
b) D/A converter
c) Oscilloscope
d) Voltage source
Answer: a
Explanation: An analog to digital converter provides digital outputs. The A/D converters are designed in such a way that they accept external commands in order to convert and hold the operations.
6. A/D converters can’t be used for low frequency ranges.
a) True
b) False
Answer: b
Explanation: Analog to digital converters based on the dual slope techniques are usually used in the conversion of low frequency data coming from the thermocouples.
7. Which technique is most widely used in the single channel data acquisition system?
a) Counter type approximation
b) Flash approximation
c) Successive approximation
d) Delta Sigma approximation
Answer: c
Explanation: The successive approximation technique is most widely used in a single channel data acquisition system. This is due to the fact that it has a high value of resolution and high speed.
8. What is pre-amplification?
a) reducing the magnitude of a signal
b) making the magnitude of a signal zero
c) reducing the noise
d) boosting the signal
Answer: d
Explanation: To match the input needs, the level of an input signal is boosted. This is done as the magnitude of the input signal is sometimes very low. This is known as pre-amplification.
9. How can the input be isolated from the system?
a) using optocouplers
b) using op-amps
c) using a capacitor
d) using rectifiers
Answer: a
Explanation: By making use of an optocoupler, we can isolate the input signal from the system. Before processing the data, pre-amplifiers are fitted with active filters so as to eliminate the noise and boost the signal.
Multiple Channel Data Acquisition System
1. Multichannel data acquisition system has __________
a) multiple channels
b) single channel
c) two channels
d) five channels
Answer: a
Explanation: A multichannel data acquisition system has multiple channels. The various subsystems can be shared in terms of time by more than two or more input sources.
2. How many types of multiplexed system exist?
a) 2
b) 3
c) 5
d) 10
Answer: b
Explanation: In general there are three types of multiplexed systems. They are as follows:
• Multichannel Analog Multiplexed System
• Multiplexing Output of Sample/Hold Circuits
• Multiplexing after A/D Conversion.
3. Multichannel Analog Multiplexed System is __________
a) very fast
b) fast
c) slow
d) moderate
Answer: c
Explanation: The Multichannel Analog Multiplexed System is one type of multiplexed system. It is comparatively slow. As it shares more than one channel, the cost is less.
4. Multichannel Analog Multiplexed System utilises time __________
a) using a transformer
b) using a capacitor
c) using a flip-flop
d) using a mux
Answer: d
Explanation: Multichannel Analog Multiplexed System is one type of multiplexed system. It makes use of a multiplexer (mux) to utilise the time. The previous data stored in the sample and hold circuit gets converted into digital form.
5. In a Multichannel Analog Multiplexed System __________
a) A/D converter is used
b) D/A converter is used
c) Sigma delta converter is used
d) Modulator is used
Answer: a
Explanation: In a Multichannel Analog Multiplexed System, individual analog signals are applied directly. The signals are amplified and conditioned. An A/D converter then converts the signals into digital form.
6. In a Multichannel Analog Multiplexed System, data stored in sample and hold circuit is converted into analog form.
a) True
b) False
Answer: b
Explanation: The Multichannel Analog Multiplexed System, converts the previous data stored in the sample and hold circuit into digital form. Upon data collection, mode of the sample and hold circuit is changed to hold mode.
7. Many channels can be monitored at the same time by __________
a) Demultiplexing
b) A/D conversion
c) Multiplexing
d) D/A conversion
Answer: c
Explanation: Monitoring of a number of channels can be done at the same time by multiplexing the outputs of the sample and hold circuit.
8. Multiplexing after A/D conversion involves _____________
a) noisy data
b) mixed signal data
c) analog data
d) digital data
Answer: d
Explanation: Multiplexing after A/D conversion is also known as fast data acquisition. Digital data performs the logical operation and depending on the relative speed, the scan rate can be increased or decreased.
9. Multiplexing after A/D conversion provides immunity to noise.
a) True
b) False
Answer: a
Explanation: Multiplexing after A/D conversion involves the transformation of analog signal into digital form. Data transmission provides, immunity from line frequency and other interferences.
PC based Data Acquisition System
1. What led to the development of PC based transducers?
a) low cost
b) medium cost
c) high cost
d) zero cost
Answer: a
Explanation: Easy availability, low cost and large scale usage of Personal Computers have led to the development of interfaces between PC and the transducer outputs.
2. ADD ON card is used for _______
a) to reduce noise
b) communication
c) to boost the magnitude
d) to measure voltage
Answer: b
Explanation: PC based data acquisition system makes use of an ADD ON card for the purpose of communication and analysis of multiple measurement data.
3. PC based data acquisition system displays system parameters ____________
a) once in a while
b) intermittently
c) continuously
d) only at specific intervals
Answer: c
Explanation: A PC based data acquisition system displays the parameters of a system in a continuous manner. As a result all the parameters are monitored instantaneously and conveniently.
4. What are MIMIC displays?
a) man-material interface
b) man-made interface
c) man-machine interface
d) man-machine interface
Answer: d
Explanation: In a PC based data acquisition system, MIMIC displays are used for displaying the data measured at any part of a system on the screen. MIMIC stands for man-machine interface.
5. System parameters are distinguished by physical attributes.
a) True
b) False
Answer: a
Explanation: In a PC based data acquisition system, physical attributes such as blink, underline, inverse video, etc are used to display the system parameters.
6. Personal computer does not contain additional hardware in a PC based data acquisition system.
a) True
b) False
Answer: b
Explanation: In a PC based data acquisition system, the personal computer consists of additional hardware for data analysis and data acquisition. These are integrated through the means of software.
7. Data analysis hardware is used for _______
a) making the process independent
b) slowing the process
c) fastening the process
d) making the process constant
Answer: c
Explanation: In a PC based data acquisition system, data analysis software is used for the purpose of mainly fastening the computations and analysis in case of DSP applications.
8. Input signal range in a PC based data acquisition system is _______
a) 0.10 mV to 1 V
b) 1 mV to 100 V
c) 5 mV to 5 V
d) 10 mV to 10 V
Answer: d
Explanation: In a PC based data acquisition system, the input signal in the range of 10 mV to 10 V is amplified by means of a digital programmable gain amplifier to a particular level.
9. Amplified input signal is digitised through ________
a) A/D converters
b) D/A converters
c) Rectifiers
d) Sigma delta modulators
Answer: a
Explanation: In a PC based data acquisition system, the amplified input signal is converted to digital form by making use of high speed A/D converters. These are interfaced to the PC bus.