R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation MCQ Question Set 16

What is ‘live zero’?

1. Output zero for zero input
2. Output non zero for zero input
3. Output null for all input
4. Output unpredictable

✅ Correct Answer: 2

Which of the following is caused by careless handling?

1. Systematic error
2. Gross error
3. Random error
4. None of the mentioned

✅ Correct Answer: 2

‘A system will be error free if we remove all systematic error’.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Which of the following is not a fundamental quantity?

1. Length
2. Angle
3. Time
4. Luminous intensity

✅ Correct Answer: 2

Which standard is fixed and used for industrial laboratories?

1. International standard
2. Primary standard
3. Secondary standard
4. Working standard

✅ Correct Answer: 3

Which of the following error is caused by poor calibration of the instrument?

1. Random error
2. Gross error
3. Systematic error
4. Precision error

✅ Correct Answer: 3

How systematic errors are eliminated?

1. Frequent measurement
2. Replacement of instrument
3. Finding mean of reading
4. Finding variance of reading

✅ Correct Answer: 2

Which of the following represents an SI unit of luminous intensity?

1. Lumen
2. Candela
3. Dioptre
4. None of the mentioned

✅ Correct Answer: 2

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?

1. Displacement = 1m, Error = 0.5m
2. Displacement = 2m, Error = 0.36m
3. Displacement = 1.8m, Error = 0.36m
4. Displacement = 1.5m, Error = 0.4m

✅ Correct Answer: 3

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

1. |c|.ΔX
2. ΔX⁄|c|
3. ΔX
4. (ΔX)c

✅ Correct Answer: 2

‘Zero error is an indication of instrumental error’.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following represents Laplace transform of ramp signal?

1. 1⁄S3
2. 1⁄S2
3. 1⁄S
4. 1

✅ Correct Answer: 2

Laplace transform function f (t) is F(S), then how will you represent Laplace transform for differential of f (t)?

1. S⁄F(S)
2. F(S)
3. S.F(S)
4. F’(S)

✅ Correct Answer: 3

Which of the following function is represented using a given condition? f (t) = 1 for t=0 0 otherwise

1. Step function
2. Sine function
3. Ramp function
4. Impulse function

✅ Correct Answer: 4

What is the result of the expression f(t)= u (t+2) – u (t-3)?

1. f (t) = 1 for -2 ≤ t ≤ 3
2. f (t) = 1 for 2 ≤ t ≤ 3
3. f (t) = 1 for -2 ≤ t ≤ -1
4. f (t) = 1 for -2 ≤ t ≤ 0

✅ Correct Answer: 1

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)

1. Step signal
2. Impulse signal
3. Sinusoidal signal
4. Ramp signal

✅ Correct Answer: 4

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

1. S.F(S)
2. F(S)
3. F(S2)
4. F(S)⁄S

✅ Correct Answer: 4

Which of the following represents Laplace transform of sinh(at)?

1. a⁄(S2+a2)
2. a⁄(S2-a2)
3. S⁄(S2+a2)
4. S⁄(S2-a2)

✅ Correct Answer: 2

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

1. 0
2. 1
3. 0.2
4. 0.5

✅ Correct Answer: 3

What is the purpose of making internal resistance of milli-ammeter very low?

1. High sensitivity
2. High accuracy
3. Minimum voltage drop across meter
4. Maximum voltage drop across meter

✅ Correct Answer: 3

Which of the following devices can be used with both AC and DC?

1. PMMC
2. Moving iron type
3. Moving coil type
4. Induction type

✅ Correct Answer: 2

How many electrons are contributed in one coulomb electric charge?

1. 6.242 × 1018
2. 6.242 × 1019
3. 6.242 × 1020
4. 6.242 × 1010

✅ Correct Answer: 1

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?

1. 4.5×1020
2. 5×1017
3. 3.75×1017
4. 3.75×1018

✅ Correct Answer: 3

Which of the following can be treated as an equivalent of ampere?

1. Coulomb/second
2. Watt/second
3. Joule/second
4. Coulomb

✅ Correct Answer: 1

What will be the average value of current, if its peak value is 43A?

1. 27.4A
2. 37.7A
3. 21.5A
4. 60.8A

✅ Correct Answer: 1

Using a low resistant shunt Moving coil, permanent magnet instrument can be converted to _________

1. Volt meter
2. Ammeter
3. Flux-meter
4. Watt meter

✅ Correct Answer: 2

An induction meter can handle current up to ______

1. Below 10A
2. 10A
3. 50A
4. 100A

✅ Correct Answer: 4

Which of the following effect is used in AC ammeters?

1. Electromagnetic effect
2. Electrostatic effect
3. Chemical effect
4. Magnetic effect

✅ Correct Answer: 1

A Multimeter is used to measure ______

1. Only AC current
2. Only DC voltage
3. Both AC and DC quantities
4. Resistance only

✅ Correct Answer: 3

Which of the following device can be used to measure low voltage?

1. VTVM
2. Moving iron voltmeter
3. CRO
4. None of the mentioned

✅ Correct Answer: 3

Which of the following applications are electrostatic instruments suited for?

1. With AC quantities only
2. With AC and DC quantities
3. With DC quantities only
4. none of the mentioned

✅ Correct Answer: 2

Which of the following unit is used to express the sensitivity of analog voltmeter?

1. Ohms
2. Voltage
3. No unit
4. Ohms per volt

✅ Correct Answer: 4

In a CRO what is the purpose of the blanking circuit?

1. To increase visual quality
2. To increase number of channels
3. To eliminate retrace of signals due to movement of spot
4. None of mentioned

✅ Correct Answer: 3

Who invented the first digital voltmeter?

1. Edward Lawry Norton
2. Andrew Kay
3. Joseph Henry
4. Nicola tesla

✅ Correct Answer: 2

Which of the following can be the range of input impedance of voltmeter?

1. less than 1Ω
2. Between 1Ω and 10Ω
3. Very high
4. unpredictable

✅ Correct Answer: 3

What is the purpose of a differential amplifier in voltmeter?

1. Elimination of unwanted signals
2. To find difference of voltages
3. To eliminate DC components
4. To eliminate DC components

✅ Correct Answer: 1

In a CRO to which part saw tooth waveform is applied?

1. Horizontal amplifier
2. To fluorescent screen
3. Vertical deflection plate
4. Electron gun

✅ Correct Answer: 1

What will be the sensitivity of a volt meter with 0 to 7mA meter movement?

1. 143 Ω/ V
2. 140 Ω/V
3. 100 Ω/V
4. 10 Ω/V

✅ Correct Answer: 1

Who invented the Wheatstone bridge?

1. Samuel Hunter Christie
2. Sir Charles Wheatstone
3. Joseph henry
4. Andrew Kay

✅ Correct Answer: 1

In a Wheatstone bridge, which of the following is used as a null detector?

1. Ammeter
2. Galvanometer
3. Voltmeter
4. Wattmeter

✅ Correct Answer: 2

Which of the following can be measured using a Wheatstone bridge?

1. Resistance only
2. Capacitance only
3. Inductance only
4. Resistance, capacitance, inductance, impedance

✅ Correct Answer: 4

Which of the following device is used for measuring low resistance value?

1. Wheatstone bridge
2. Hay bridge
3. Kelvin bridge
4. Owens bridge

✅ Correct Answer: 3

A null type instrument with DC excitation is ________

1. Wheatstone bridge
2. Hay bridge
3. Anderson bridge
4. Wien bridge oscillator

✅ Correct Answer: 1

Which of the following device is used with 4 terminal resistors?

1. Wheatstone bridge
2. Hay bridge
3. Wien bridge
4. Kelvin bridge

✅ Correct Answer: 4

Why 4 terminal resistors are used?

1. For protection
2. To overcome parasitic resistances
3. To increase current flow
4. None of the mentioned

✅ Correct Answer: 2

What are the four terminals in four terminal resistance?

1. 3 current terminals and one voltage terminal
2. Two potential terminals and two current terminals
3. Four voltage terminals
4. Four current terminals

✅ Correct Answer: 2

Accuracy in a bridge measurement depends on_____

1. Sensitivity of detector
2. Applied voltage
3. Both Sensitivity and applied voltage
4. Accuracy of indicator

✅ Correct Answer: 3

What is the Common Mode Rejection Ratio?

1. Output of a differential amplifier
2. Ability of an amplifier to reject common mode signals
3. Ability of an amplifier to accept common mode signals
4. None of the mentioned

✅ Correct Answer: 2

Which of the following is not a characteristic of an ideal op-amp?

1. Zero slew rate
2. Infinite bandwidth
3. Infinite input impedance
4. Zero output impedance

✅ Correct Answer: 1

For an inverting amplifier positive terminal of input is connected to ____________ of 741 IC.

1. Pin number 3
2. Pin number 2
3. Pin number 1
4. Pin number 7

✅ Correct Answer: 2