230+ Mechanical Measurements Solved MCQs

1.

A discrepancy is

A. The difference between a measurement and true value of the quantity measured
B. The difference between true value of the quantity and error
C. The difference between the measured value and actual value
D. The difference between the measured values of the same quantity
E. None of the above
Answer» D. The difference between the measured values of the same quantity
2.

One of more electronic tubes are used in the circuitry of a VTVM for

A. amplification
B. rectification
C. both for amplification and rectification
D. None of the above
E. Any of the above
Answer» C. both for amplification and rectification
3.

Which of the following thermocouple can be used for temperatures above 1000?C

A. Platinum - Rhodium
B. Chromel - Alumel
C. High pressure Chromel - Copper
D. Any of the above
E. None of the above
Answer» A. Platinum - Rhodium
4.

The advantage of digital instruments is

A. No observational error
B. Faster reading
C. Output can be fed to a memory circuit
D. Better accuracy
E. All of the above
Answer» E. All of the above
5.

The standard sulphur point temperature is

A. 212?C
B. 444.60?C
C. 666.80?C
D. 100?C
E. 999.99?C
Answer» B. 444.60?C
6.

Odometer is used to measure

A. Distances
B. Threshold odours
C. Composition of gases
D. Velocities and accelerations
E. Suspended solids in a gas
Answer» A. Distances
7.

Accuracy of mesurements depends upon

A. precision of technique
B. precision of instruments employed
C. good planning of instruments
D. all of above
E. Any of the above
Answer» D. all of above
8.

A three digit 0 - 1 V digital voltmeter will have a resolution of

A. 0.1 V
B. 1 mV
C. 1, A
D. 1/2 V
E. 1
Answer» B. 1 mV
9.

Which of the following materials has maximum resistivity

A. Nichrome
B. Isoeleastic
C. Karma
D. None of the above
E. Any of the above
Answer» B. Isoeleastic
10.

Under force-current analogy, viscous friction coefficient is considered analogous to

A. Reciprocal of capacitance
B. Reciprocal of inductance
C. Reciprocal of resistance
D. Reciprocal of current
E. Resistance
Answer» C. Reciprocal of resistance
11.

Loading error in a system can be classified as

A. Systematic error
B. error of judgement
C. illegitimate error
D. None of the above
E. Any of the above
Answer» A. Systematic error
12.

A piezometer is used to measure

A. Very low pressures
B. High pressures
C. Pressure differential
D. Pressures above and below atmospheric pressure
E. Atmospheric pressures
Answer» A. Very low pressures
13.

Range of temperature measurement of a resistance thermometer is

A. ? 50? F to 200? F
B. ? 100? F to 400? F
C. ? 200? F to 800? F
D. ? 400? F to 1800? F
E. Any of the above
Answer» D. ? 400? F to 1800? F
14.

The pH value of pure water could be

A. 1
B. 7
C. 10
D. 0
E. 14
Answer» B. 7
15.

The sensitivity accuracy of an instrument depends on

A. Frequency response
B. Amplitude distortion
C. Tempearature variations
D. Hysteresis
E. None of the above
Answer» C. Tempearature variations
16.

Mcleod gauge is used to measure

A. pH value
B. Pressure
C. Vacuum
D. Flow rate
E. Suspended matter
Answer» C. Vacuum
17.

The material used in the construction of a thermistor is

A. Nickel oxide
B. Iron oxide
C. Nickel
D. None of the above
E. Any of the above
Answer» A. Nickel oxide
18.

A magneto-strictive transducer works on the principle of variations of

A. Permeability of magnetic materials when subjected to strain
B. Resistance of material when subjected to strain
C. Flux linkage of material when subjected to strain
D. None of the above
E. Manometer
Answer» A. Permeability of magnetic materials when subjected to strain
19.

A right balance meter cannot measure

A. Pressure
B. Flow
C. Mass flow rate
D. All of the above
E. None of the above
Answer» D. All of the above
20.

Which of the following is the displacement type blow measuring device?

A. Helix type
B. Nutating disc
C. Semi-rotary piston
D. Reciprocating piston
E. Turbine
Answer» E. Turbine
21.

The carrier material used with strain gages at room temperatuer is

A. impregnated paper
B. bakelite
C. epoxy
D. None of the above
E. Any of the above
Answer» A. impregnated paper
22.

The specific conductance of good quality raw water is

A. 1 micro mho/cm
B. 1000 micro mho/cm
C. 0.1 micro mho/cm
D. 10 micro mho/cm
E. 100 micro mho/cm
Answer» E. 100 micro mho/cm
23.

Which of the following phosphor bronze material is usually brazed?

A. Beryllium copper
B. Phosphor bronze
C. Stainless steel
D. K-monel
E. Alloy steel
Answer» A. Beryllium copper
24.

A temperature sensitive transducer is subjected to a sudden temperature change. It takes 18 seconds for the transducer to reach equilibrium condition (five times constant). The time taken by the transducer to read half of the temperature difference will be nearly

A. 0.35 second
B. 0.99 second
C. 0.69 second
D. 1.38 second
E. 3.92 second
Answer» D. 1.38 second
25.

A fathometer works on the principle of

A. Reflection of magnetic waves
B. Reflection of sound waves
C. Reflection of ultrasonic waves
D. Reflection of radio waves
E. Reflection of gamma rays
Answer» B. Reflection of sound waves
26.

A load cell cannot be used to measure

A. Weight
B. Temperature
C. Level
D. Pressure
E. All of the above
Answer» B. Temperature
27.

Thermistors have

A. Zero temperature coefficient
B. Low and positive temperature coefficient
C. 14
D. High and negative temperature coefficient
E. Low and negative temperature coefficient
Answer» D. High and negative temperature coefficient
28.

The flow of non-conducting medium cannot be measured by

A. Orifice
B. Rotameter
C. Electro magnetic meter
D. Turbine meter
E. All of the above
Answer» C. Electro magnetic meter
29.

Natural error in measurements is due variation in

A. wind pressure
B. humidity
C. Temperature coefficient of liquids
D. Any of the above
E. Any of the above
Answer» D. Any of the above
30.

Which of the following standard can be used for defining length?

A. Bar standard
B. End standard
C. Light wave standard
D. Any of the above
E. None of the above
Answer» D. Any of the above
31.

The static error bank of an instrument does not include

A. Hysteresis in the instrument
B. Electrical draft
C. Non-linearity
D. All of the above
E. None of the above
Answer» B. Electrical draft
32.

Platinum is used in resistance thermometers because of

A. Low cost
B. Low cost and high stability
C. Low cost, high stability and wide operating range
D. None of the above
E. 14
Answer» C. Low cost, high stability and wide operating range
33.

Under force-current analogy, velocity is considered analogous to

A. Voltage
B. Inductance
C. Resistance
D. Magnetic flux
E. None of the above
Answer» A. Voltage
34.

To measure the speed of a shaft without physical contact the method used is

A. Digital method
B. Variable reluctance tachometer
C. Stroboscope
D. Any of the above
E. All of the above
Answer» D. Any of the above
35.

A measure of the system's ability to handle transients is known as

A. Amplitude response
B. Rise time
C. Phase response
D. All of the above
E. Any of the above
Answer» B. Rise time
36.

Contraction or expansion due to changes in temperature can be measured by

A. Tellurometer
B. Dilatometer
C. Thermocouple
D. Fathometer
E. Optical pyrometer
Answer» B. Dilatometer
37.

The accuracy depends upon

A. Precision of instrument
B. Precision of method
C. Good planning
D. All of the above
E. None of the above
Answer» D. All of the above
38.

Which of the following is the area meter?

A. venturimeter
B. orifice meter
C. rotameter
D. None of the above
E. Any of the above
Answer» C. rotameter
39.

A error that always follows the same definite mathematical or physical law is known as

A. Detectable error
B. Cumulative error
C. Mathematical error
D. Systematic error
E. Physical error
Answer» D. Systematic error
40.

Which of the following is not a source of power?

A. Solar cell
B. Photovoltaic cell
C. Thermo-couple
D. Photoelectric cell
E. 15?C
Answer» C. Thermo-couple
41.

A hot wire anemometer is used to measure

A. Gas velocities
B. Liquid discharges
C. Pressure of gases
D. Very low pressures
E. Diameter of fine particles
Answer» A. Gas velocities
42.

Freeqing point of mercury is

A. ? 98.87?C
B. ? 48.80?C
C. ? 38.87?C
D. None of the above
E. Any of the above
Answer» C. ? 38.87?C
43.

Which of the following transducers is preferred for measurements involving sound

A. thermocouple
B. Kundt's tube
C. peizoelectric pick up
D. None of the above
E. Any of the above
Answer» C. peizoelectric pick up
44.

Which of the following magnetic material has least value of (B.H.)max?

A. Alnico
B. Cobalt steel
C. Carbon steel
D. 3.92 second
E. Alcomax
Answer» C. Carbon steel
45.

A load cell is essentially a

A. Strain gauge
B. Photo voltaic cell
C. Thermistor
D. Thermocouple
E. Photoconductive device
Answer» A. Strain gauge
46.

Bolometers are used for measurement of

A. Thermal radiations
B. Electromagnetic, radiations
C. Manetic hysteresis loop area
D. Intensity of light
E. All of the above
Answer» A. Thermal radiations
47.

Which of the following strain gauge material has the highest value of gauge factor?

A. 1
B. Manganin
C. Nichrome
D. Constantan
E. Soft iron
Answer» E. Soft iron
48.

Ceremets are

A. resistance elements
B. veriable capacitances
C. variable inductances
D. None of the above
E. Any of the above
Answer» A. resistance elements
49.

The standard silver point temperature is

A. 1155.5?C
B. 887.95?C
C. 666?C
D. 860.5?C
E. 788.90?C
Answer» D. 860.5?C
50.

The maximum allowable limit that a measurement may vary from the true value is known as

A. expected error
B. permissible error
C. Range of error
D. None of the above
E. Any of the above
Answer» B. permissible error
51.

A pirani gauge works on the principle of change of

A. Capacitance
B. Electrical resistivity
C. Relative humidity
D. Thermal conductivity of medium
E. Conductance
Answer» D. Thermal conductivity of medium
52.

The thickness of oil film between gage blocks is of the order of

A. 0.2 microinch
B. 0.5 microinch
C. 1 microinch
D. None of the above
E. Any of the above
Answer» A. 0.2 microinch
53.

The degree of perfection used in instruments, the methods and the observations, is known as

A. Error
B. Least count
C. Accuracy
D. Efficiency
E. Precision
Answer» E. Precision
54.

A flow measuring system with a square root extractor usually has

A. Linear scale
B. No-linear scale
C. Inverse square law curve
D. Mass flow rate scale
E. None of the above
Answer» A. Linear scale
55.

A flapper nozzle is used in

A. Electronic controller
B. Hydraulic Controller
C. Pneumatic controller
D. All of the above
E. None of the above
Answer» C. Pneumatic controller
56.

Which of the following materials has minimum temperature coefficient of resistance

A. Constantan
B. Isoelastic
C. Nichrome
D. None of the above
E. Any of the above
Answer» A. Constantan
57.

The direction of current in case of antimony bismuth thermocouple will be

A. From antimony to bismuth at the cold junction
B. From antimony to bismuth at hot junction
C. From bismuth to antimony at cold junction
D. Any of the above
E. None of the above
Answer» A. From antimony to bismuth at the cold junction
58.

A hydrometer can be used to measure

A. Specific gravity of solids
B. Temperature coefficient of liquids
C. Relative humidity of air
D. Conductivity of gases
E. Specific gravity of liquids
Answer» E. Specific gravity of liquids
59.

The advantage of piezoelectric crystal as transducer is

A. High frequency response
B. High output
C. Negligible phase shift
D. Small size
E. All of the above
Answer» E. All of the above
60.

In a thermocouple, the potential between the two junctions is due to the temperature gradient along the conductors in the circuit. This effect is named as

A. Peltier's effect
B. Thomson's effect
C. Seebeck effect
D. none of the above
E. Any of the above
Answer» B. Thomson's effect
61.

Nickel is the major constituent of which the following pressure gauge Bourdon tube material

A. Alloy steel
B. Phosphor bronze
C. K' monel
D. Beryllium copper
E. Stainless steel
Answer» C. K' monel
62.

In a car the fuel level is measured by

A. Electronic transducer
B. Float method
C. Dip stick
D. Any of the above
E. None of the above
Answer» B. Float method
63.

Flow rate of a river can be determined by

A. Weir
B. Orifice
C. Venturimeter
D. Kundt's tube
E. Kennison nozzle
Answer» A. Weir
64.

Under force-current analogy, the reciprocal of inductance is considered analogous to

A. Mass
B. Spring constant
C. Momentum
D. Displacement
E. Velocity
Answer» B. Spring constant
65.

The larget range through which the measurable variable can change without the change being indicated by the indicator is known as

A. Probability error
B. Time lag
C. Dead zone
D. Threshold sensitivity
E. None of the above
Answer» C. Dead zone
66.

Which of the following instruments is preferred for the measurement of pressure in a steam condenser

A. Kentometer
B. McLeod gage
C. Bourdon tube
D. None of the above
E. Any of the above
Answer» A. Kentometer
67.

Which of the following materials has macimum gaga factor

A. Nichrome
B. Isoelastic
C. Karma
D. None of the above
E. Any of the above
Answer» B. Isoelastic
68.

The most sensitive thermocouple out of the following

A. copper-constantan
B. chromel-constantan
C. iron-constantan
D. None of the above
E. Any of the above
Answer» B. chromel-constantan
69.

Invar, the least expensible steel alloys used for measuring tapes contains about 30% of

A. Vanadium
B. Cobalt
C. Aluminium
D. Copper
E. Nickel
Answer» E. Nickel
70.

The statement "The most probable value of an observed quantity available from a given set of observation is the one for which the sum of the square of errors is a minimum" is known as

A. Principle of square errors
B. Pythogorus theorem
C. Principle of least squares
D. Law of square probability
E. Law of errors
Answer» C. Principle of least squares
71.

For bridge circuit of strain gauge which source of power will be ideal?

A. High frequency ac source
B. Low frequency ac source
C. Difficulties in connections and high cost of auxiliary equipment
D. Low voltage of source
E. High voltage dc source
Answer» A. High frequency ac source
72.

A first order system when subjected to a step input has a temperature rise of 25?C after one hour and 37.5?C after two hours, starting from cold conditions. The final steady temperature rise will be

A. 5?C
B. 15?C
C. 35?C
D. 25?C
E. 50?C
Answer» E. 50?C
73.

The degree of perfection used in instruments, techniques are observations is known as

A. Accuracy
B. Precision
C. Least Count
D. None of the above
E. Any of the above
Answer» B. Precision
74.

An electrometer is used for the measurement of

A. Voltages
B. Currents
C. Both (A) and (B) above
D. None of the above
E. 14
Answer» C. Both (A) and (B) above
75.

A synchro is

A. A variable reluctance transducer
B. A parabolic transducer
C. An angular position transducer
D. A synchronizing transducer
E. Any of the above
Answer» C. An angular position transducer
76.

The errors which form inexperience of the observer are known as

A. Personal errors
B. Mistakes
C. Training errors
D. Accidental errors
E. Handling errors
Answer» B. Mistakes
77.

The duty cycle of a pulse of width 2 micro sec and repetition frequency 4 kHz is

A. 0.5
B. 0.008
C. 0.05
D. 0.0006
E. 0.00008
Answer» B. 0.008
78.

Which of the following device cannot be used to measure pressure?

A. Pirani gauge
B. Strain gauge
C. LVDT
D. Manometer
E. Bolometer
Answer» E. Bolometer
79.

If a measuring tape is too long as compared to standard, the error will be known as

A. Manufacturing error
B. Natural error
C. Superficial error
D. Personal error
E. Instrumental error
Answer» E. Instrumental error
80.

An iron-constantan thermocouple can be used for the temperature

A. ?175?C to 900?C
B. ?250?V to 1500?C
C. ?373?C to 1800?C
D. 0?C to 2500?C
E. 0?C to 600?C
Answer» A. ?175?C to 900?C
81.

For measuring the temperature of a boiler furnace which one of the following is the appropriate thermometer?

A. Optical pyrometer
B. Bimetallic thermometer
C. Thermocouple
D. Resistance thermometer
E. Any of the above
Answer» A. Optical pyrometer
82.

The resistance of a strain gauge should be high

A. To increase sensitivity
B. To reduce hysteresis effect
C. To swamp out the effects of variations of resistance in other parts of the bridge
D. None of the above
E. 100 to 5000
Answer» B. To reduce hysteresis effect
83.

Which of the following transducer is used to translate linear motion into electrical signals?

A. Bourdons tube
B. LVDT
C. Bellows
D. Strain gauge
E. Thermistor
Answer» B. LVDT
84.

If an error under the same conditions will always be of the same size and sign, it is known as

A. Training errors
B. Systematic errors
C. Cumulative error
D. Either of (A) and (B) above
E. Either of (B) and (C) above
Answer» E. Either of (B) and (C) above
85.

The degree of fementation in brewing pressure can be measured by

A. Bolometer
B. Conductivity meter
C. pH meter
D. Smoke meter
E. Turbidity meter
Answer» C. pH meter
86.

Which of the following will be the most alkaline solution?

A. pH 4
B. pH 1
C. pH 7
D. pH 10
E. pH 14
Answer» E. pH 14
87.

McLeod gage is used to measure

A. pressure
B. vacuum
C. Flow rate
D. None of the above
E. Any of the above
Answer» A. pressure
88.

The standard oxygen point temperature is

A. 182.97?C
B. ?213.99?C
C. 163.45?C
D. ?182.27?C
E. 0?C
Answer» D. ?182.27?C
89.

In measurements using two strain gauges, the purpose of dummy strain gauge is

A. To unllify the errors due to temperature
B. Improve stability of the measuring system
C. Measure lateral strain
D. Increase the sensitivity of measuring system
E. None of the above
Answer» A. To unllify the errors due to temperature
90.

If a steam pressure of 10 kg/cm2 is to be measured, the range of pressure gauge should be

A. 0 to 100 kg kg/cm2
B. 0 to 10 kg kg/cm2
C. 0 to 20 kg kg/cm2
D. ?10 kg/cm2 to + 10 kg kg/cm2
E. 5 to 11 kg kg/cm2
Answer» C. 0 to 20 kg kg/cm2
91.

Which of the following can be used as thermal detector?

A. Thermistor
B. Pyrometer
C. Thermocouple
D. Resistance thermometer
E. Any of the above
Answer» E. Any of the above
92.

The electricl resistarice of a wire is

A. Directly proportional to diameter and inversely proportional to length
B. Directly proportional to length and inversely proportional to diameter
C. Directly proportional to length and diameter
D. Inversely proportional to resistance and length
E. None of the above
Answer» A. Directly proportional to diameter and inversely proportional to length
93.

The joints of a phosphor-bronze Bourdon tubes are

A. Welded
B. Brazed
C. Soldered
D. Jointed by adhesives
E. Screwed
Answer» C. Soldered
94.

Which of the following temperature is highest.

A. Melting point of gold
B. melting point of silver
C. melting point of steel
D. None of the above
E. Any of the above
Answer» D. None of the above
95.

Which of the following device can be used to give an indication for temperature changes?

A. Thermistor
B. Bourden gauge
C. Transistor
D. Thermocouple
E. LED
Answer» D. Thermocouple
96.

A simple ac amplifier may be used to amplify dc input through use of an additional circuit component known as

A. tuned amplifier
B. carrier
C. chopper
D. None of the above
E. Any of the above
Answer» C. chopper
97.

Positive displacement flow meters are

A. variable area flow meter
B. differential pressure flow meter
C. quantity flow meter
D. None of the above
E. Any of the above
Answer» C. quantity flow meter
98.

Which of the following meter is preferred for the measurement of pressure in a steam condenser?

A. Manometer
B. Kentometer
C. Pitot tube
D. Mcleod gauge
E. None of the above
Answer» B. Kentometer
99.

A rotameter is used to measure

A. velocity of liquids
B. pressure of gases
C. specific gravity of liquids
D. None of the above
E. Any of the above
Answer» A. velocity of liquids
100.

Which of the following transducer is preferred for measurements involving sound?

A. Piezoelectric pick up
B. Photoemissive cell
C. Volt box
D. Kundt's tube
E. Thermocouple
Answer» A. Piezoelectric pick up
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