MCQ'S ON ELETRICAL MEASURMENTS

 1.Deflection methods of direct  measurements are most widely used as these are 

a) mostly simple

b)most accurate 

c)least time consuming

d) most simple and least time consuming 

ans : d

2 Comparison methods are used

a)because these are most simple

b)because these are inexpensive

c)because these take least time in measurement

ans: d

3 The main advantage of the null balance technique of measurement is that  

a)it does not load the medim

b)it gives a centre zero value as its input 

c)it gives a quick measurement

d)it is not affected by temperature variation 

ans:a

4 The region between the limits within which a quantity is measured received or transmitted ,expressed by stating the lower and upper limits is called the

a) range

b) span

c)range limit

d)none of these 

ans : a 

5 The span of a zero-centers voltmeter having a scale from -10v to10v is

a) 0V

b) -10v

c)10v

d)20v

ans :d

6 if two meters X & Y require 40mA &50mA respectively,to give full deflection,then

a)X is more sensitive 

b) Y is more sensitive 

c)both  are sensitive

d)it is not possible to asses with the data given

ans :a

7 A meter having a sensitivity of 2kOhm/V is used for the measurement of voltage across a circuit having an output resistance of 1kohm and open circuit voltage of 8V.What is the meter at its 10V scale

a)57.2V

B)6.51V

c)7.62V 

d)7.91V

ans c

8 The smallest change in a measured variable to which an instrument will respond is 

a)accuracy

b)resolution

c)precision

d)sensitivity 

ans b

9 Resolution of an instrument of an instrument is 

a) the minimum quantity it can measure 

b) the maximum quantity it can measure

c)the maxiumum nonlinearity 

d)ablility to distinguish polarity 

ans: a 

10 Hysteresis in an instrument means

a) the change in same reading when the input is first increased and then reduced 

b)the reliablity if the instrument 

c)the repeatability of the instrument 

d)the inaccuracy due to change in temperature

ans :a

11 The static error band of an instrument implies the

a) accuracy of the instrument

b) the irrepeatability of the instrument 

c)error caused when the pen stopped at some deflection

d) error introduced in low varying inputs

ans: c 

12 the static error band of an instrument does not include 

a)non linearity

b)electric drift

c)hysteresis in the instrument

d)non of these 

ans :b

13 the fact as to how closely the instrument reading follows is measured variables is called the

a)accuracy

b)precision

c)fidelity

d)sensitivity

ans :c

14 An higher scale ammeter is used to measure too low current The measurement would have low

a) precision

b)accuracy

c)resolution

d)all of the above

ans:d

15 Thermal zero-shift in an instrument refers to

a)maximum variation in pen zero due to temperature variation

b)inaccuracy in measurement due to temperature variation

c)shift in zero adjustment due to expansion of springs due ti temperature variation 

d)non of the above

ans a