MCQ on static characteristics of Measuring Instrument
MCQ on static characteristics of Measuring Instrument, Multiple Choice Questions on EMI, MCQ of instrumentation & measurement, Multiple Choice Questions on static characteristics of instrumentation & measurement systems, GATE Questions on static characteristics of Measuring Instrument
Objective Type Questions
1. In measurement systems, which of the following static characteristics are desirable?
- Accuracy
- Sensitivity
- Reproducibility
- All of above
Answer: All of above
2. In measurement systems, which of the following are undesirable static characteristics :
- Sensitivity and accuracy
- Drift, static error, and dead zone
- Reproducibility and non-linearity
- Drift, static error, dead zone, and non-linearity
Answer: Drift, static error, dead zone, and non-linearity
3. A pressure measurement instrument is calibrated between 10 bar and 250 bar. The scale spam of the instrument is :
- 10 bar
- 250 bar
- 240 bar
- 260 bar
Answer: 240 bar
while the scale range is,
- 10 bar
- 250 bar
- 240 bar
- 260 bar
Answer: 250 bar
4. The output of an instrument under particular environmental conditions is given by the relationship q0 = a + b qi, where qi = input and a and b are constants b ≠ 1. The theoretical input-output relationship is represented by a straight passing through zero. This is a case of
- zero drift only
- sensitivity drift only
- zero and sensitivity drift together
- none of the above
Answer: zero and sensitivity drift together
5. A reading is recorded as 23.90 C°. The reading has :
- three significant figures
- five significant figures
- four significant figures
- None of the above
Answer: four significant figures
6. The scale of a 0-500V voltmeter is divided into ten large divisions representing 50 V each and each large division is further subdivided into 10 small divisions, each representing 5 V. It is used for measurement of output voltage of a potentiometer which can be varied from 0 to 500V. It is observed that when the sliding contact is moved from its zero position, there is no perceptible movement of pointer of the voltmeter till the sliding contact reaches a position where the output voltage should be 5 V. Therefore, it can be concluded that :
- the threshold of the voltmeter is 5 V
- the resolution of the voltmeter is 5 V
- the sensitivity of the voltmeter is 5V
- None of the above
Answer: the threshold of the voltmeter is 5 V
7. In the centre zero analog ammeter having a range of – 10 A to + 10A, there is a detectable change of the pointer from its zero position on either side of the scale only if the current reaches a value of 1A. The ammeter has a :
- resolution of 1 A.
- the dead zone of 1 A.
- the dead zone of 2 A.
- sensitivity of 1 A
Answer: the dead zone of 2 A.
8. A pressure gauge is calibrated from 0-50 kN/m2. It has a uniform scale with 100 scale divisions. One-fifth of a scale division can be read with certainty. The gauge has a :
- resolution of 0.1 kN/m2
- threshold of 0.1 kN/m2
- dead zone of 0.2 kN/m2
- a resolution of 0.5 kN/m2
Answer: resolution of 0.1 kN/m2
9. A d.c. circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 kΩ. In order to achieve 99 percent accuracy for voltage measurement across its terminals, the voltage measuring device should have :
- a resistance of at least 10 MΩ
- the resistance of 100 kΩ
- a resistance of at least 10 Ω
- none of the above
Answer: a resistance of at least 10 MΩ
10. A d.c. circuit can be represented by a voltage source of 10 V in series with an output resistance of 1 kΩ. An ammeter of 50 Ω resistance is connected to the source terminals for measurement of current. The accuracy of measurement is nearly :
- – 4.8 percen
- + 4.8 percent
- 99 percent
- 95.2 percent
Answer: 95.2 percent
11. In a.c. circuits, the connection of measuring instruments causes loading errors which may affect
- only the magnitude of quantity being measured
- only the phase of the quantity being measured
- both the magnitude and phase of the quantity being measured
- magnitude, phase, and also the waveform of the quantity being measured
Answer: magnitude, phase, and also the waveform of the quantity being measured
12. The input resistance of a cathode ray oscilloscope is of the order of :
- tens of ohm
- megohms
- kilohms
- fraction of an ohm
Answer: megohms
13. A resistor, at room temperature of 290 K has a noise voltage of 2 µV for a 50 kHz bandwidth. The temperature at which the noise voltage is 20% of its value at room temperature is :
- 58 K
- 11.6 K
- 241.7 K
- None of the above
Answer: 11.6 K
14. An amplifier has an input signal voltage of 25 µV and a noise voltage 2.5 µV. The signal to noise ratio is
- 10
- 100
- 10 db
- none of the above
Answer: 100
15. Johnson noise is :
- caused by thermal agitation of free electrons carrying current thereby modulating the current
- the noise carried into a circuit through conductors
- the noise of an electromagnetic origin that is radiated into a circuit
- shot noise which results from random emission of electrons across a p n junction
Answer: caused by thermal agitation of free electrons carrying current thereby modulating the current
16. In a measurement system if a q1 is an across variable and its associated through variable is q2 (power based), the static impedance of the system is
- q1 x q2
- q1/q2
- q2/q1
- q12/q2
Answer: q1/q2
17. In a measurement system ‘force’ is an across variable. Its associated power based through variable is :
- translational displacement
- translational acceleration
- translational velocity
- rotational displacement
Answer: translational velocity
18. The values of static stiffness and compliance in a measurement system determine the amount of :
- power drain from a system
- current drain from a system
- energy drain from a system
- none of the above
Answer: energy drain from a system
19. A Wheatstone bridge is balanced with all the four resistances equal to 1 kΩ each. The bridge supply voltage is 100 V. The value of one of the resistances is changed to 1010 Ω. The output voltage is measured with a voltage measuring device of infinite resistance. The bridge sensitivity is :
- 10 V/Ω
- 25 mV/Ω
- 2.5 mV/Ω
- None of the above
Answer: 25 mV/Ω
20. Backlash is
- The gradual departure of instrument output from its calibrated value.
- The ability of the device to give an identical output when repeated or measurements are made with the same input signal.
- Maximum angle or distance through which any part of a mechanical system may be moved in one direction without causing motion of the next part.
- Unwanted signal tending to obscure the transducer signal
Answer: Maximum angle or distance through which any part of a mechanical system may be moved in one direction without causing motion of the next part.