Free Measurement and Instrumentation MCQs with Answers

• A. galvanometer
• B. ammeter
• C. voltmeter
• D. all of the above

Explanation: A moving-coil galvanometer produces torque when current-carrying conductors lie in a magnetic field.

• A. current
• B. voltage
• C. resistance
• D. power

Explanation: A Wheatstone bridge compares resistor ratios and reaches balance when the detector current is zero.

• A. 20,000 Ω
• B. 100,000 Ω
• C. 200,000 Ω
• D. 1,000,000 Ω

Explanation: Voltmeter resistance equals sensitivity multiplied by the selected range: 20,000 Ω/V × 5 V = 100,000 Ω.

• A. 1 V
• B. 50 V
• C. 500 V
• D. 1,000 VCompare Power Rates

Explanation: A voltmeter's input resistance is generally highest on its highest voltage range, so it draws the least current from the circuit.

• A. Acceleration
• B. Speed
• C. Speed and acceleration
• D. Displacement
• E. None of the above

Explanation: A tachogenerator produces an output voltage proportional to angular velocity, so it is used to measure speed.

• A. Thermocouple
• B. Potentiometer
• C. Gear train
• D. LVDT
• E. None of the above

Explanation: A thermocouple generates a voltage from a temperature difference through the Seebeck effect, directly converting thermal information into…

• A. Alternating current
• B. Direct current
• C. A.C. voltage
• D. D.C. voltage
• E. None of the above

Explanation: A thermocouple converts a temperature difference into a thermoelectric emf, whose polarity is fixed for a given temperature gradient.

• A. Vernistats
• B. Microsyns
• C. Resolvers
• D. Any of the above

Explanation: Veristats, microsyns, and resolvers can all convert positional error into an electrical signal for comparison and correction.

• A. static sensitivity
• B. dynamic deviation
• C. linearity
• D. precision or accuracy

Explanation: Linearity is commonly specified as the maximum deviation from the ideal straight-line response divided by full-scale value, usually…

• A. multiple shunt or series resistances inside the meter
• B. multicoii arrangement
• C. variable turns of coil
• D. multi range meters inside the measurement system
• E. any of the above

Explanation: A multirange meter obtains different ranges by switching suitable shunt resistors for current measurement or series resistors for voltage…

• A. that it works on the principle of complex variation
• B. that it measures the response of linear ramp voltage
• C. same as digital meter
• D. that it measures the amplitude of a single at two points and at the same time measures their phase difference

Explanation: A vector voltmeter measures the magnitude of a signal and the phase difference between signals at two points, so it gives their voltage…

• A. safe guard it against creep
• B. brake the instrument
• C. bring energy meter to stand still
• D. maintain steady speed and equal to driving torque

Explanation: The driving torque makes the energy-meter disc rotate, while braking torque opposes it until the disc reaches a steady speed.

• A. (n - 1) wattmeter elements
• B. n wattmeter elements
• C. (n + 1) wattmeter elements
• D. 2n wattmeter elements

Explanation: For an n-phase circuit, the total power can be measured with n−1 wattmeters because the sum of the wattmeter readings gives total power.

• A. Amplifier gain and phase shift
• B. Filler transfer functions
• C. Complex insersion loss
• D. All of the above

Explanation: A vector voltmeter measures both magnitude and phase, allowing gain and phase shift, filter transfer functions, and complex insertion loss…

• A. light load or friction
• B. lag and creep
• C. overload and voltage compensation
• D. temperature compensation
• E. all of the above

Explanation: Energy meters require several corrections, including friction or light-load adjustment, lag and creep compensation, overload and voltage…

• A. induction instrument
• B. electrostatic instrument
• C. moving coil instrument
• D. any of the above

Explanation: Current and voltage instrument transformers, such as CTs and PTs, extend the usable range of AC instruments, including induction-type…

• A. elastic galvanometer
• B. vibration galvanometer
• C. Duddlb galvanometer
• D. spot ballistic galvanometer

Explanation: A spot ballistic galvanometer uses optical spot deflection and is designed to detect very small quantities of charge, giving very high…

• A. instrumental errors
• B. environmental errors
• C. observational errors
• D. all of the above

Explanation: Systematic errors have a consistent cause or pattern and may arise from the instrument, the environment, or the observer.

• A. deflecting and control
• B. deflecting and damping
• C. deflecting, control and damping
• D. vibration and balancing

Explanation: An analogue instrument needs deflecting torque to produce movement, controlling torque to establish the final position, and damping torque…

• A. balancing weight
• B. deflection angle
• C. sine of deflection angle

Explanation: In a gravity-controlled instrument, controlling torque is proportional to sin θ.