## electrician

### MCQ ON MEASURING INSTRUMENT PAGE - 1

1.
 In a moving coil instrument, the damping torque is developed by A Air friction B Eddy current C Gravity friction D Fluid friction Answer : B Explanation :
2.
 The force acting in a M.C instrument is equal to : A B.I.V B B.I.v sin q C B.I.i D B.l.i. sinq Answer : C Explanation :
3.
 M.C type instruments are used on A A.C B D.C C A.C. or D.C D None of these Answer : B Explanation :
4.
 M.I type instruments are used on A A.C only B D.C. only C A.C. or D.C D None of these Answer : C Explanation :
5.
 The force which produces movement of the pointer of an instrument is called : A Deflecting force B Controlling force C Damping force D Distracting force Answer : A Explanation :
6.
 What is the purpose of providing a mirror behind the pointer in a measuring instrument ? A The scale is illuminated through the mirror B To observe that the pointer is bend or not C Being semi transparent , a mirror helps in the study of inner construction of the  instrumen D To make the reading free from an error by removing parallax between the pointer and its image. Answer : D Explanation :
7.
 When using any instrument for measurement or testing purpose, first attention should be given to the A Theoretical knowledge B Personal safety C Surroundings D Dress Answer : B Explanation :
8.
 which one of the following statements is true about the internal resistance of an ammeter and a voltmeter? A The internal resistance of an ammeter should be very low and that of a voltmeter should be very h B The internal resistance of an ammeter should be very  high and that of a voltmeter should be C The internal resistance of an ammeter and a voltmeter should be very low D The internal resistance of an ammeter and a voltmeter should be very high. Answer : A Explanation :
9.
 The reliability of measuring instruments means: A The life of the instrument B The extent to which its characteristics remain linear C The degree to which repeatability continues to remain within specific limits D All of these. Answer : C Explanation :
10.
 The sensitivity of a measuring instrument means. A The maximum value of a physical quantity that can be measured B The highest reading of the scale C The minimum readin of the scale D The smallest amount of a physical quantity that can be detected by the instrument. Answer : D Explanation :
11.
 In order to increase the range of a voltmeter A Low resistance is connected in series B Low resistance is connected in parallel C A high resistance is connected in series D A high resistance is connected in parallel Answer : C Explanation :
12.
 To reduce the effect of a voltmeter on the circuit under test, we should A Decrease the multiplier resistance B Use an instrument with a high internal resistance C Use a shunt resistor D Use an A.C. meter with a rectifier Answer : B Explanation :
13.
 If the connections of an M.I instrument used in a circuit are interchanged then: A It will not give a reading B Its reading will not change. C It will give a deflection in an opposite direction D It will burn out . Answer : B Explanation :
14.
 A.M.I type instrument has: A A linear scale B A non-linear scale C An exponential scale D A logarithmic scale Answer : B Explanation :
15.
 A.M.C type instrument has: A A linear scale B A non linear scale C An exponential scale D A logarithmic scale Answer : A Explanation :
16.
 If two ammeters X and Y require 40 mA and 50mA current respectively to give a full-scale deflection, then A X is more sensitive B Y is more sensitive C Both are sensitive D Sensitivity cannot be judge with the given information Answer : A Explanation :
17.
 The value of a shunt resistance in an ammeter is usually: A Equal to the meter resistance B Greater than the meter resistance C Lessor than the meter resistance D Of any value Answer : C Explanation :
18.
 If the approximate value of the current to be measured  is not known, measurement should be started on A The lowest range B The middle range C The highest range D Any range Answer : C Explanation :
19.
 The sensitivity of a voltmeter is expressed as A Volts/ohm B Ohm volt C 1/ohm. Volt D Ohms/volt Answer : D Explanation :
20.
 The disadvantage associated with an electrodynamics instrument is this that: A It consumes more electric power B It has low torque to weight ratio C Its frequency range is low D All of these Answer : Select Correct Ans Explanation :