Analytical instruments MCQ Quiz Hub

1. What is ‘live zero’?
Output zero for zero input
Output non zero for zero input
Output null for all input
Output unpredictable

2. Which of the following is caused by careless handling?
Systematic error
Gross error
Random error
None of the mentioned

3. ‘A system will be error free if we remove all systematic error’.
True
False
all of the above
None of the mentioned

4. Which of the following is not a fundamental quantity?
Length
Angle
Time
Luminous intensity

5. Which standard is fixed and used for industrial laboratories?
International standard
Primary standard
Secondary standard
Working standard

6. Which of the following error is caused by poor calibration of the instrument?
Random error
Gross error
Systematic error
Precision error

7. How systematic errors are eliminated?
Frequent measurement
Replacement of instrument
Finding mean of reading
Finding variance of reading

8. Which of the following represents an SI unit of luminous intensity?
Lumen
Candela
Dioptre
None of the mentioned

9. Starting position of an object is represented as x=5.1±0.2m and finishing position as y=6.9±0.3m. What will be the displacement and error in displacement?
Displacement = 1m, Error = 0.5m
Displacement = 2m, Error = 0.36m
Displacement = 1.8m, Error = 0.36m
Displacement = 1.5m, Error = 0.4m

10. Uncertainty in quantity X is given by ΔX. Then what will be the uncertainty in quantity R for which R=c.X?
|c|.ΔX
ΔX⁄|c|
ΔX
(ΔX)c

11. ‘Zero error is an indication of instrumental error’.
True
False
all of the above
None of the mentioned

12. Which of the following represents Laplace transform of ramp signal?
1⁄S3
1⁄S2
1⁄S
1

13. Laplace transform function f (t) is F(S), then how will you represent Laplace transform for differential of f (t)?
S⁄F(S)
F(S)
S.F(S)
F’(S)

14. Which of the following function is represented using a given condition? f (t) = 1 for t=0 0 otherwise
Step function
Sine function
Ramp function
Impulse function

15. What is the result of the expression f(t)= u (t+2) – u (t-3)?
f (t) = 1 for -2 ≤ t ≤ 3
f (t) = 1 for 2 ≤ t ≤ 3
f (t) = 1 for -2 ≤ t ≤ -1
f (t) = 1 for -2 ≤ t ≤ 0

16. Transfer function of a system is given by 1/S. If system has a step input, what will be the output in time domain?(Function exist only for positive time value)
Step signal
Impulse signal
Sinusoidal signal
Ramp signal

17. Function f (t) has Laplace transform F(S). How will you represent Laplace transform of integral of f(t)?
S.F(S)
F(S)
F(S2)
F(S)⁄S

18. Which of the following represents Laplace transform of sinh(at)?
a⁄(S2+a2)
a⁄(S2-a2)
S⁄(S2+a2)
S⁄(S2-a2)

19. Find the initial value of current for which transient current is given by I(S) = (S2+S)⁄(5S2+1)
0
1
0.2
0.5

20. What is the purpose of making internal resistance of milli-ammeter very low?
High sensitivity
High accuracy
Minimum voltage drop across meter
Maximum voltage drop across meter

21. Which of the following devices can be used with both AC and DC?
PMMC
Moving iron type
Moving coil type
Induction type

22. How many electrons are contributed in one coulomb electric charge?
6.242 × 1018
6.242 × 1019
6.242 × 1020
6.242 × 1010

23. In a conductor after 1 minute of electron passage, current flown is found to be 1mA. How many electrons would have passed through that conductor?
4.5×1020
5×1017
3.75×1017
3.75×1018

24. Which of the following can be treated as an equivalent of ampere?
Coulomb/second
Watt/second
Joule/second
Coulomb

25. What will be the average value of current, if its peak value is 43A?
27.4A
37.7A
21.5A
60.8A

26. Using a low resistant shunt Moving coil, permanent magnet instrument can be converted to _________
Volt meter
Ammeter
Flux-meter
Watt meter

27. An induction meter can handle current up to ______
Below 10A
10A
50A
100A

28. Which of the following effect is used in AC ammeters?
Electromagnetic effect
Electrostatic effect
Chemical effect
Magnetic effect

29. A Multimeter is used to measure ______
Only AC current
Only DC voltage
Both AC and DC quantities
Resistance only

30. Which of the following device can be used to measure low voltage?
VTVM
Moving iron voltmeter
CRO
None of the mentioned

31. Which of the following applications are electrostatic instruments suited for?
With AC quantities only
With AC and DC quantities
With DC quantities only
none of the mentioned

32. Which of the following unit is used to express the sensitivity of analog voltmeter?
Ohms
Voltage
No unit
Ohms per volt

33. In a CRO what is the purpose of the blanking circuit?
To increase visual quality
To increase number of channels
To eliminate retrace of signals due to movement of spot
None of mentioned

34. Who invented the first digital voltmeter?
Edward Lawry Norton
Andrew Kay
Joseph Henry
Nicola tesla

35. Which of the following can be the range of input impedance of voltmeter?
less than 1Ω
Between 1Ω and 10Ω
Very high
unpredictable

36. What is the purpose of a differential amplifier in voltmeter?
Elimination of unwanted signals
To find difference of voltages
To eliminate DC components
To eliminate DC components

37. In a CRO to which part saw tooth waveform is applied?
Horizontal amplifier
To fluorescent screen
Vertical deflection plate
Electron gun

38. What will be the sensitivity of a volt meter with 0 to 7mA meter movement?
143 Ω/ V
140 Ω/V
100 Ω/V
10 Ω/V

39. Who invented the Wheatstone bridge?
Samuel Hunter Christie
Sir Charles Wheatstone
Joseph henry
Andrew Kay

40. In a Wheatstone bridge, which of the following is used as a null detector?
Ammeter
Galvanometer
Voltmeter
Wattmeter

41. Which of the following can be measured using a Wheatstone bridge?
Resistance only
Capacitance only
Inductance only
Resistance, capacitance, inductance, impedance

42. Which of the following device is used for measuring low resistance value?
Wheatstone bridge
Hay bridge
Kelvin bridge
Owens bridge

43. A null type instrument with DC excitation is ________
Wheatstone bridge
Hay bridge
Anderson bridge
Wien bridge oscillator

44. Which of the following device is used with 4 terminal resistors?
Wheatstone bridge
Hay bridge
Wien bridge
Kelvin bridge

45. Why 4 terminal resistors are used?
For protection
To overcome parasitic resistances
To increase current flow
None of the mentioned

46. What are the four terminals in four terminal resistance?
3 current terminals and one voltage terminal
Two potential terminals and two current terminals
Four voltage terminals
Four current terminals

47. Accuracy in a bridge measurement depends on_____
Sensitivity of detector
Applied voltage
Both Sensitivity and applied voltage
Accuracy of indicator

48. What is the Common Mode Rejection Ratio?
Output of a differential amplifier
Ability of an amplifier to reject common mode signals
Ability of an amplifier to accept common mode signals
None of the mentioned

49. Which of the following is not a characteristic of an ideal op-amp?
Zero slew rate
Infinite bandwidth
Infinite input impedance
Zero output impedance

50. For an inverting amplifier positive terminal of input is connected to ____________ of 741 IC.
Pin number 3
Pin number 2
Pin number 1
Pin number 7