Free Measurement and Instrumentation MCQs with Answers

• A. short-circuited
• B. open circuited
• C. alright
• D. leaky

Explanation: A healthy capacitor initially shows low resistance while charging and then rises to a very high value.

• A. Wien's bridge
• B. Wheatstone bridge
• C. Schering bridge
• D. Hay's bridge

Explanation: A Schering bridge is specifically used to measure capacitance and dielectric loss, especially for insulating materials.

• A. show low resistance momentarily and back off to a very high resistance
• B. show high resistance momentarily and then a very low resistance
• C. go quickly to 50 ohm approximately and remain there
• D. not move at all

Explanation: A discharged capacitor initially conducts like a low resistance, so the ohmmeter reading starts low.

• A. infinity
• B. few kilo ohms
• C. few megohms
• D. zeroCapacitors

Explanation: A short-circuited capacitor provides a direct conducting path between its terminals.

• A. 0.8
• B. 0.9
• C. 1.0187
• D. 1.5

Explanation: The Weston standard cell has a reference emf of approximately 1.018 V at 20°C, conventionally stated as 1.0187 V in this type of question.

• A. lowered
• B. raised
• C. undisturbed
• D. displaced sideways

Explanation: For a hydrometer to remain upright, its centre of gravity must lie below its centre of buoyancy, producing a restoring moment after…

• A. manometer
• B. a mechanical gauge
• C. hydrometer
• D. psychrometer

Explanation: A hydrometer measures the specific gravity of a liquid by the depth to which its float sinks.

• A. electronic equipment
• B. transformers
• C. current transformers
• D. auto transformers

Explanation: Decibels express a logarithmic ratio of power or signal levels and are widely used for gains and losses in electronic equipment.

• A. resistance rise method
• B. thermometer method
• C. embedded temperature method
• D. all above methods

Explanation: Stator winding temperature can be found by measuring resistance rise, using a thermometer, or using embedded temperature detectors.

• A. Barometer
• B. Hygrometer
• C. U-tube manometer
• D. Venturi metre

Explanation: A U-tube manometer measures pressure relative to another pressure and can therefore measure vacuum or negative gauge pressure.

• A. 10-8 mm
• B. 10″6 cm
• C. 10″10 m
• D. 10~14 m

Explanation: An angstrom is defined as 10^-10 metre, a unit commonly used for atomic and molecular dimensions.

• A. zero
• B. infinite
• C. high but within tolerance
• D. low but not zero

Explanation: An open resistor has a broken conducting path, so no current flows through it.

• A. Lorentz method
• B. Releigh method
• C. Ohm's law method
• D. Wheatstone bridge method

Explanation: The Lorenz method is an absolute method for measuring resistance, based on comparing electrical heating effects with mechanical work or…

• A. voltmeter
• B. rheostat
• C. wattmeter
• D. galvanometer

Explanation: A galvanometer is a sensitive instrument used to detect small electric currents.

• A. Line integrated stabilization network
• B. Line impedance stabilization network
• C. Line integrated stored network
• D. Laser integrated stabilization networking

Explanation: LISN means Line Impedance Stabilization Network. It presents a standardized impedance to the equipment under test and couples conducted…

• A. Current
• B. Voltage
• C. Power
• D. Speed

Explanation: A voltmeter measures potential difference, or voltage, between two points and is connected in parallel.