Recent questions and answers in Digital Instrumentation

2 answers 55 views
0 answers 29 views

In a sample-and-hold circuit, the aperture time is (A) time required following a sample (B) time required for the switch to open (C) transition time interval between sample and hold (D) time from the hold command to the opening of the switch 

asked Jun 4, 2018 in Digital Instrumentation
1 answer 24 views

Describe the basic SHA operation with the help of its four mode specifications.

answered May 23, 2018 in Digital Instrumentation
1 answer 13 views

How many non-overlapping channels are available in IEEE 802.11b

answered May 23, 2018 in Digital Instrumentation
1 answer 16 views

Number of comparators required for an 8 bit flash ADC is: (1) 8 (2) 16 (3) 255 (4) 256

answered May 22, 2018 in Digital Instrumentation
1 answer 16 views

In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of bits required is   (A) 7 (B) 8 (C) 9 (D) 200

answered May 17, 2018 in Digital Instrumentation
1 answer 12 views

Choose the correct statement  (a) Digital multimeters are built using current measuring elements, while analog multimeters are built using voltage measuring units (b) Digital multimeters are built using voltage measuring units, while analog multimeters are built using current measuring units (c) Both digital and analog multimeters are built using voltage measuring units (d) Both digital and analog multimeters are built using current measuring units

answered May 15, 2018 in Digital Instrumentation
1 answer 13 views

An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is  (a) 10 mA (b) 20 mA (c) 50 mA (d) 100 μA

answered May 15, 2018 in Digital Instrumentation
1 answer 11 views

An optical fiber cable laid underground has developed a discontinuity at a distance d from the source end. The fault can be located using the instrument  (a) Optical spectrum Analyzer (OSA) (b) Optical Time Domain Reflectometer (OTDR) (c) Optical Power Meter (OPM) (d) Laser Diffractometer (LD)

answered May 15, 2018 in Digital Instrumentation
1 answer 10 views

Two sinusoidal signals of the same frequency are displayed on a dual-trace oscilloscope. One complete cycle of each signal covers 6 cm of the horizontal scale and the starting point of the horizontal scale and the starting point of the two signals are separated by 0.5 cm. The phase difference between the two signals in degrees is  (a) 30 (b) 45 (c) 60 (d) 90

answered May 15, 2018 in Digital Instrumentation
1 answer 17 views

Transient signals can be observed using  (a) storage oscilloscope (b) sampling oscilloscope (c) wave analyzer (d) spectrum analyzer

answered May 15, 2018 in Digital Instrumentation
1 answer 11 views

The trace on an oscilloscope continually moves to the right of the screen when  (a) the sweep is triggered. (b) the sweep period is larger than the signal period. (c) the sweep period is smaller than the signal period. (d) there is no weep.

answered May 15, 2018 in Digital Instrumentation
1 answer 8 views

In a dual trace oscilloscope, the display appears segmented when  (a) low frequency signals are observed in Alternate mode (b) low frequency signals are observed in Chop mode (c) high frequency signals are observed in Alternate mode (d) high frequency signals are observed in Chop mode

answered May 15, 2018 in Digital Instrumentation
1 answer 7 views

To distinguish between signals having very close values, we need an instrument with  (a) high accuracy (b) high resolution (c) high sensitivity (d) high linearity

answered May 15, 2018 in Digital Instrumentation
1 answer 14 views

In a weighted-resistor digital-to-analog converter with 8-bit input, if the resistance corresponding to the MSB is 2K, what will be the resistance corresponding to the LSB?  (a) 250 Ω (d) 512 KΩ (c) 256 KΩ (d) 25.5 Ω

answered May 15, 2018 in Digital Instrumentation
1 answer 11 views

ESD stands for

answered May 14, 2018 in Digital Instrumentation
1 answer 11 views

In a particular circuit connection, AWG 18 wire is selected over AWG 22. The reason is that it is having

answered May 14, 2018 in Digital Instrumentation
1 answer 22 views

Very small displacements are effectively measured using

answered May 14, 2018 in Digital Instrumentation
1 answer 9 views

Y –axis in a CRO normally represents

answered May 14, 2018 in Digital Instrumentation
1 answer 23 views

What are the types of error?

answered May 6, 2018 in Digital Instrumentation
1 answer 25 views
1 answer 19 views

What are the SI derived units?

answered May 6, 2018 in Digital Instrumentation
1 answer 29 views

What are the seven base units?

answered May 6, 2018 in Digital Instrumentation
1 answer 35 views

What is logic analyser?

answered May 6, 2018 in Digital Instrumentation
1 answer 34 views
1 answer 28 views
1 answer 30 views

Which type of ADC gives high resolution?

answered May 4, 2018 in Digital Instrumentation
1 answer 28 views

Which is the fastest type of analogue to digital converter?

answered May 4, 2018 in Digital Instrumentation
1 answer 18 views

Gross errors occur in measurements because of (A) disturbances about which we are unaware. (B) human mistakes. (C) inherent shortcomings in the instrument. (D) loading effects on the meters.

answered Apr 28, 2018 in Digital Instrumentation
1 answer 29 views

The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating anode voltage is reduced to half of its previous value. Then, the vertical deflection of the beam on the screen would become (A) 64 mm (B) 32 mm (C) 8 mm (D) 1 mm

answered Apr 28, 2018 in Digital Instrumentation
1 answer 18 views

The operation of a ramp type Digital Voltmeter is based on the principle of (A) Voltage-to-current conversion. (B) Voltage-to-time conversion. (C) Current-to-time conversion. (D) Current-to-frequency conversion.

answered Apr 28, 2018 in Digital Instrumentation
1 answer 21 views

The ADC having highest conversion speed is (A) Dual-slope ADC (B) Successive approximation ADC (C) Flash ADC (D) Servo ADC

answered Apr 28, 2018 in Digital Instrumentation
0 answers 392 views

Enlist the different modes of operation of electronic counters and explain any two modes in details.

asked Mar 2, 2018 in Digital Instrumentation
0 answers 31 views

Explain frequency domain synthesis. Which techniques fall into the category of frequency domain synthesis?

asked Mar 2, 2018 in Digital Instrumentation
0 answers 355 views

Write short notes on:  1) Phosphor characteristics  2) Liquid crystal display

asked Mar 2, 2018 in Digital Instrumentation
0 answers 42 views

Explain the basic dual slope ADC technique used in digital multimeters with its diagram and measurement cycle.

asked Mar 2, 2018 in Digital Instrumentation
0 answers 39 views

Explain the basic operation of an oscilloscope with necessary diagram for each section in detail.

asked Mar 2, 2018 in Digital Instrumentation
0 answers 26 views

Discuss DAC architectures based on resistor ladders.

asked Mar 2, 2018 in Digital Instrumentation
0 answers 20 views

Describe the various blocks and their functions in pipelined ADC architecture.

asked Mar 2, 2018 in Digital Instrumentation
2 answers 46 views
2 answers 60 views
1 answer 46 views
2 answers 35 views
1 answer 49 views

what are the advantages of digital multimeter ?

answered Aug 20, 2017 in Digital Instrumentation
1 answer 32 views
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