## Measurements and Instrumentation Part 8

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Attempt Free Measurements and Instrumentation Part 8 Here. Read The Important Electrical MCQ From Below.

(a) 5MHz sweep

(b) 10MHz vertical oscillator

(c) 10MHz horizontal oscillator

(d) 10MHz supply frequency

Answer

[2] Which of the following instruments can be used to measure AC current only?

(a) Permanent Magnet Type ammeter

(b) Induction type ammeter

(c) Moving iron voltmeter

(d) Moving iron ammeter

Answers:

1. D only

2. B only

3. A, B, D

4. B and D only

Answer

Measurements and Instrumentation Part 8

[3] An oscilloscope indicates

(a) Peak to peak value of voltage

(b) DC value of voltage

(c) RMS value

(d) Average value

Answer

[4] In a ballistic galvanometer, the deflecting torque is proportional to

(a) the current through coil

(b) square of current through coil

(c) square-root of current through coil

(d) sine of measured

Answer

[5] The error of an instrument is normally given as a percentage of

(a) measured value

(b) full-scale value

(c) mean value

(d) rms value

Answer

Measurements and Instrumentation Part 8

[6] If the instrument is to have a wide range, the instrument should have

(a) Linear scale

(b) Square-law scale

(c) Exponential scale

(d) Logarithmic scale

Answer

[7] The resistance can be measured most accurately by

(a) Voltmeter-ammeter method

(b) bridge method

(c) multimeter

(d) Megger

Answer

[8] The repeat accuracy of an instrument can be judged from its

(a) static error

(b) linearity error

(c) dynamic error

(d) standard deviation of error

Answer

[9] Which of the following meters has a linear scale?

(a) Thermocouple meter

(b) Moving iron meter

(c) Hot wore meter

(d) Moving coil meter

Answer

Measurements and Instrumentation Part 8

[10] No eddy current and hysteresis losses occur in

(a) Electrostatic instruments

(b) PMMC instruments

(c) Moving iron instruments

(d) Electrodynamo meter instruments

Answer

[11] Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

(a) 360V and 240V

(b) 300V each

(c) 400V and 200V

(d) one of the meters out of the range and other 100V

Answer

[12] The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

(a) 49.99 Ohms

(b) 1/49.99 ohms

(c) 1 Ohm

(d) 2 Ohms

Answer

Measurements and Instrumentation Part 8

[13] The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?

(a) 99.99 K ohms

(b) 100 K ohms

(c) 99.99 ohms

(d) 100 ohms

Answer

[14] Why is a MISC meter not recommended for DC measurement?

(a) The meter is calibrated for AC and it’s error for DC would be high

(b) The meter does not respond to DC signals

(c) The error is high due to hysteresis effect

(d) The error is high due to eddy current effect

Answer

[15] The EMF of Weston standard cell is measured using

(a) Moving- iron meter

(b) Moving-coil meter

(c) Digital Volt meter

(d) Potentiometer

Answer

Measurements and Instrumentation Part 8