Dynamic Characteristics of Instruments and Measurement System MCQs

This Portion of Electrical andElectronic Measurements and Measuring instruments contains Dynamic Characteristics of Instruments and Measurement System MCQs (Multiple Choice Questions and Answers) / Objective Type Questions and Answers.

This Section covers below lists of topics.

Dynamic analysis of measurement systems
Mathematical model of measurement system
Linear and Non-linear Systems
Electric Networks
Mechanical Systems
Thermal Systems
Liquid level Systems
Sinusoidal transfer Function
Time Domain Response
Frequency Domain Analysis

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1. A Quantity whose magnitude has a definite repeating time cycle is called a :

Transient
Steady state periodic
Steady state aperiodic
Transient state periodic.

2. Dynamic response consists of:

Two parts, one steady state and the other transient state response
Only transient state response
Only steady state response
Steady state and transient frequency response.

3. The following are the desirable dynamic characteristics of a measurement system:

Fast response, fidelity, measuring lag and dynamic error.
Fast response and measuring lag
Fidelity and measuring lag
Fast response and fidelity.

4. The output of the system is given by the following equation: y= ax + b Where x is the input and a and b are constants. The system exhibits:

Linear behavior
Non-linear behavior as it does not satisfy the property of superposition
None-linear behavior as it does not satisfy the property of homogeneity
Non-linear behavior because it does not satisfy property of both superposition and homogeneity.

5. The dynamic response of a system is given by the following differential equation :d³ a₃ ((d^3 c(t))/(dt^3 )) + a₂ ((d^2 c(t))/(dt^2 ))+ a₁ (dc(t)/dt) + a₀c(t) = b₂ ((d^2 r(t))/(dt^2 ))+ b₁ (dr(t)/dt) + b₀r(t) Where c(t) and r(t) are respectively the output and input and a_3, a_2, a_1, a_0, b_2, b_1, b₀are constants. It is a :

Non-linear system
Linear system
Linear time variant system
Linear time invariant system.

6. In a force current analogy stiffness constant K is analogous to :

Inductance
Reciprocal of inductance
Capacitance
Reciprocal of capacitance.

7. In a force-voltage analogy viscous friction constant B is analogous to :

Resistance
Reciprocal of resistance
Inductance
Capacitance

8. In thermal system if M is mass liquid stored, Q is the liquid inflow rate and s is the specific heat, the thermal resistance is given by:

Ms
Qs
1/Ms
1/Qs

9. In Liquid level systems, the units of capacitance of a tank are :

m²
m³
m²/s
m^-2s

10. The transfer function of a system is defined as :

Ratio of laplace transform of input to laplace transform of output with initial conditions not equal to zero
Ratio of laplace transform of output to laplace transform of input with initial conditions not equal to zero
Ratio of laplace transform of input to laplace transform of output with all initial conditions equal to zero
Ratio of laplace transform of output to laplace transform of input with all initial conditions not equal to zero

11. A first order system is subjected to a step input. its time constant can be defined as :

Time for the output to rise to 63.2% of its final steady value in the case of rising output.
Time for the output to drop to 36.8% of its initial value in the case of a decaying output.
Time for the output to rise( in case of rising output) reach its final steady value if the initial rate of change of output is maintained
All of the above.

12. A first order system has a time constant of 20 s. it is subjected to step input. The setting time of the output is assumed to be the time it reaches 95% of the final steady value.The setting time of the system is :

100 s
60 s
20 s
Infinity.

13. An RC series circuit has a resistance of 2 MΩ and a capacitance of 1µF. it is subjected to step input of 10 V. The dynamic error ( refers to voltage across capacitor) at time t = 4 s of application of input is :

1.35 V
0.5 V
3.68 V
0 V.

14. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant is 300 s. it is desired to reduce time constant to 100 s. what is the new volume of bulb, of all other conditions remain the same except the dimension of the bulb :

3 mm³
37 mm³
10 mm³
577 mm³

15. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant and sensitivity are respectively 300 s and 3.6 mm/°C. if the volume of the bulb is reduced to 500 mm³, the sensitivity becomes :

7.2 mm/°C
10.8 mm/°C
1.8 mm/°C
1.2 mm/°C if other conditions remain same.

16. A balloon is fitted with a first order temperature measuring device with time constant of 20 s. it is also fitted with zero order instruments for altitude measurements. It radios back to earth both temperature and altitude signals. The decrease in temperature is 0.02 x°C where x is the altitude in meter. The balloon travels vertically at a speed of 5 m/s. The balloon radios back altitude signal as 3000m. The decrease in temperature radios back to earth is :

60°C
58°C
62°C
None of the above.

17. A 2 gm mass is suspended from a single spring. The deflection caused is 5 mm. The natural frequency of the system is :

7 Hz
22 Hz
2.2 Hz
None of the above.

18. In a second order system, the damping factor is 0.65 and the natural frequency is 4 Hz. If the stiffness of spring is halved, the new value of damping factor and natural frequency are:

0.92, 2.83 Hz
0.46, 5.66 Hz
0.92, 5.66 Hz
0.46, 2.83 Hz

19. In a second order system, the steady state error is 0.02. if both viscous friction constant and spring constant are doubled, the steady error will be :

0.01
0.04
0.0025
0.02.

20. In second order system, the frequency of damped oscillations is 18 rad/s. The value of damping factor is 0.866. The natural frequency of oscillations is :

15.6 rad/s
19.3 rad/s
36 rad/s
9 rad/s

21. In a second order system, the peak overshoot is 100%. The value of damping factor is :

1
0.707
0
0.5.

22. For a second order system, the settling time for ±2% band is _____________ Where ξ = damping factor and ω_η = natural frequency : rad/s.

3/(ξω_η )
5/(ξω₀ )
2ξω_η
4/(ξω_η )

23. In a second order damped system, the value of peak overshoot in per unit terms is :

M_p = exp(πξ/√(1-ξ² ))
M_p = - exp(πξ/√(1-ξ² ))
M_p = exp(-πξ/√(1-ξ² ))
M_p = (πξ/√(1-ξ² )

24. A first order thermometer has a time constant of 50 s. it is subjected to a sinusoidal input cycling at 0.002 Hz. The time lag of instrument is :

50 s
44.6 s
500 s
0.01 s.

25. In order that first order instrument should indicate an output which is within ±10% of the true value of the output when suspended to a sinusoidal input the product 𝛚Ϯ, where 𝛚 = angular frequency of input and Ϯ time constant of instrument should be :

Less than 0.5
Greater than 0.5
Less than 10
Greater than 10.

26. A second order system when subjected to a unit step input has a peak overshoot of 10%. The same system when subjected to a sinusoidal input of unit amplitude will have a resonant peak of nearly :

103%
110%
190%
None of the above.

27. A second order underdamped system has a damping factor of 0.8. it is subjected to a sinusoidal input of unit amplitude.it has resonant peak of :

108%
92%
20%
It has no resonant peak.

28. Bandwidth, a frequency domain concept, is indicative of

rise time in time domain
settling time in time domain
steady state error in the domain
all the above.

29. An undamped second order instrument has a natural frequency of 500 Hz.it is subjected to a sinusoidal input of unit amplitude at 500 Hz. The amplitude of output is :

Unity
0.5
2.0
Infinity

30. The transfer function of a system is :G(s) = (100e^(-st))/(s(s+10)) The system

Is a linear system
Is s non linear system
Has a transportation lag
None of the above.

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Electrical and Electronic Measurements – Dynamic Characteristics of Instruments and Measurement System MCQs

1. A Quantity whose magnitude has a definite repeating time cycle is called a :

2. Dynamic response consists of:

3. The following are the desirable dynamic characteristics of a measurement system:

4. The output of the system is given by the following equation: y= ax + b Where x is the input and a and b are constants. The system exhibits:

6. In a force current analogy stiffness constant K is analogous to :

7. In a force-voltage analogy viscous friction constant B is analogous to :

8. In thermal system if M is mass liquid stored, Q is the liquid inflow rate and s is the specific heat, the thermal resistance is given by:

9. In Liquid level systems, the units of capacitance of a tank are :

10. The transfer function of a system is defined as :

11. A first order system is subjected to a step input. its time constant can be defined as :

12. A first order system has a time constant of 20 s. it is subjected to step input. The setting time of the output is assumed to be the time it reaches 95% of the final steady value.The setting time of the system is :

13. An RC series circuit has a resistance of 2 MΩ and a capacitance of 1µF. it is subjected to step input of 10 V. The dynamic error ( refers to voltage across capacitor) at time t = 4 s of application of input is :

14. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant is 300 s. it is desired to reduce time constant to 100 s. what is the new volume of bulb, of all other conditions remain the same except the dimension of the bulb :

15. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant and sensitivity are respectively 300 s and 3.6 mm/°C. if the volume of the bulb is reduced to 500 mm³, the sensitivity becomes :

17. A 2 gm mass is suspended from a single spring. The deflection caused is 5 mm. The natural frequency of the system is :

18. In a second order system, the damping factor is 0.65 and the natural frequency is 4 Hz. If the stiffness of spring is halved, the new value of damping factor and natural frequency are:

19. In a second order system, the steady state error is 0.02. if both viscous friction constant and spring constant are doubled, the steady error will be :

20. In second order system, the frequency of damped oscillations is 18 rad/s. The value of damping factor is 0.866. The natural frequency of oscillations is :

21. In a second order system, the peak overshoot is 100%. The value of damping factor is :

22. For a second order system, the settling time for ±2% band is _____________ Where ξ = damping factor and ω_η = natural frequency : rad/s.

23. In a second order damped system, the value of peak overshoot in per unit terms is :

24. A first order thermometer has a time constant of 50 s. it is subjected to a sinusoidal input cycling at 0.002 Hz. The time lag of instrument is :

25. In order that first order instrument should indicate an output which is within ±10% of the true value of the output when suspended to a sinusoidal input the product 𝛚Ϯ, where 𝛚 = angular frequency of input and Ϯ time constant of instrument should be :

26. A second order system when subjected to a unit step input has a peak overshoot of 10%. The same system when subjected to a sinusoidal input of unit amplitude will have a resonant peak of nearly :

27. A second order underdamped system has a damping factor of 0.8. it is subjected to a sinusoidal input of unit amplitude.it has resonant peak of :

28. Bandwidth, a frequency domain concept, is indicative of

29. An undamped second order instrument has a natural frequency of 500 Hz.it is subjected to a sinusoidal input of unit amplitude at 500 Hz. The amplitude of output is :

30. The transfer function of a system is :G(s) = (100e^(-st))/(s(s+10)) The system

Electrical and Electronic Measurements – Dynamic Characteristics of Instruments and Measurement System MCQs

1. A Quantity whose magnitude has a definite repeating time cycle is called a :

2. Dynamic response consists of:

3. The following are the desirable dynamic characteristics of a measurement system:

4. The output of the system is given by the following equation: y= ax + b Where x is the input and a and b are constants. The system exhibits:

6. In a force current analogy stiffness constant K is analogous to :

7. In a force-voltage analogy viscous friction constant B is analogous to :

8. In thermal system if M is mass liquid stored, Q is the liquid inflow rate and s is the specific heat, the thermal resistance is given by:

9. In Liquid level systems, the units of capacitance of a tank are :

10. The transfer function of a system is defined as :

11. A first order system is subjected to a step input. its time constant can be defined as :

12. A first order system has a time constant of 20 s. it is subjected to step input. The setting time of the output is assumed to be the time it reaches 95% of the final steady value.The setting time of the system is :

13. An RC series circuit has a resistance of 2 MΩ and a capacitance of 1µF. it is subjected to step input of 10 V. The dynamic error ( refers to voltage across capacitor) at time t = 4 s of application of input is :

14. The volume of bulb of a liquid filled thermometer is 1000mm3 . Its time constant is 300 s. it is desired to reduce time constant to 100 s. what is the new volume of bulb, of all other conditions remain the same except the dimension of the bulb :

15. The volume of bulb of a liquid filled thermometer is 1000mm3 . Its time constant and sensitivity are respectively 300 s and 3.6 mm/°C. if the volume of the bulb is reduced to 500 mm3, the sensitivity becomes :

17. A 2 gm mass is suspended from a single spring. The deflection caused is 5 mm. The natural frequency of the system is :

18. In a second order system, the damping factor is 0.65 and the natural frequency is 4 Hz. If the stiffness of spring is halved, the new value of damping factor and natural frequency are:

19. In a second order system, the steady state error is 0.02. if both viscous friction constant and spring constant are doubled, the steady error will be :

20. In second order system, the frequency of damped oscillations is 18 rad/s. The value of damping factor is 0.866. The natural frequency of oscillations is :

21. In a second order system, the peak overshoot is 100%. The value of damping factor is :

22. For a second order system, the settling time for ±2% band is _____________ Where ξ = damping factor and ωη = natural frequency : rad/s.

23. In a second order damped system, the value of peak overshoot in per unit terms is :

24. A first order thermometer has a time constant of 50 s. it is subjected to a sinusoidal input cycling at 0.002 Hz. The time lag of instrument is :

25. In order that first order instrument should indicate an output which is within ±10% of the true value of the output when suspended to a sinusoidal input the product 𝛚Ϯ, where 𝛚 = angular frequency of input and Ϯ time constant of instrument should be :

26. A second order system when subjected to a unit step input has a peak overshoot of 10%. The same system when subjected to a sinusoidal input of unit amplitude will have a resonant peak of nearly :

27. A second order underdamped system has a damping factor of 0.8. it is subjected to a sinusoidal input of unit amplitude.it has resonant peak of :

28. Bandwidth, a frequency domain concept, is indicative of

29. An undamped second order instrument has a natural frequency of 500 Hz.it is subjected to a sinusoidal input of unit amplitude at 500 Hz. The amplitude of output is :

30. The transfer function of a system is :G(s) = (100e(-st))/(s(s+10)) The system

14. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant is 300 s. it is desired to reduce time constant to 100 s. what is the new volume of bulb, of all other conditions remain the same except the dimension of the bulb :

15. The volume of bulb of a liquid filled thermometer is 1000mm³ . Its time constant and sensitivity are respectively 300 s and 3.6 mm/°C. if the volume of the bulb is reduced to 500 mm³, the sensitivity becomes :

22. For a second order system, the settling time for ±2% band is _____________ Where ξ = damping factor and ω_η = natural frequency : rad/s.

30. The transfer function of a system is :G(s) = (100e^(-st))/(s(s+10)) The system