Measurement and instrument theory - Electrical Engineering (MCQ) questions and answers

1)   If the two voltage measurements are V1 = 150 ± 2% and V2 = 100 ± 4% respectively. Then the maximum percentage error in the sum of two voltage measurements is

a. ± 2.4 %
b. ± 2.6 %
c. ± 2.8 %
d. ± 3.4 %
Answer  Explanation 

ANSWER: ± 2.8 %

Explanation:
No explanation is available for this question!
2)   A zero order system is the one in which output changes instantaneously as the input changes. The example of zero order system is

a. Potentiometer
b. Liquid - in - glass thermometer
c. Accelerometer
d. Transducer
Answer  Explanation 

ANSWER: Potentiometer

Explanation:
No explanation is available for this question!
3)   If a balloon is equipped with temperature and altitude measuring instruments, then the order of the temperature measuring and altitude measuring instruments are

a. Zero order, first order
b. Both are first order instruments
c. Both are zero order instruments
d. First order, zero order
Answer  Explanation 

ANSWER: First order, zero order

Explanation:
No explanation is available for this question!
4)   A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be

a. 3.2%, 96.8%
b. 3.8%, 96.2%
c. 4%, 96%
d. 4.4%, 95.59%
Answer  Explanation 

ANSWER: 4.4%, 95.59%

Explanation:
No explanation is available for this question!
5)   In a Wheatstone bridge, the formula for finding unknown resistance (R2) is given by
R2 = ( R2 R3 ) / R1
Where, R1 = 150Ω ± 0.1%
R2 = 250Ω ± 0.1%
R3 = 300Ω ± 0.1%

a. R2 = 250Ω ± 0.1%
b. R2 = 300Ω ± 0.3%
c. R2 = 750Ω ± 0.3%
d. R2 = 500Ω ± 0.3%
Answer  Explanation 

ANSWER: R2 = 500Ω ± 0.3%

Explanation:
No explanation is available for this question!
6)   While measuring resistance by the voltmeter - ammeter method, the maximum possible percentage error in the voltmeter and ammeter are ± 1.8% and ± 1.2% respectively. Then the maximum possible percentage error in the value of resistance will be

a. ± 3%
b. ± 4%
c. ± 4.2%
d. ± 4.8%
Answer  Explanation 

ANSWER: ± 3%

Explanation:
No explanation is available for this question!
7)   If the resistance in a circuit is given by 80 Ω ± 0.2% and the current flowing through it is 5A ± 0.1%, then the uncertainty in the power will be

a. ± 0.2 %
b. ± 0.4 %
c. ± 0.6 %
d. ± 0.8 %
Answer  Explanation 

ANSWER: ± 0.4 %

Explanation:
No explanation is available for this question!
8)   When a 100 V moving iron voltmeter is of accuracy class 1 - 0 is used in a circuit, it reads 50 V. Then the maximum possible percentage error in the reading is

a. 1 %
b. 2 %
c. 2.5 %
d. 3 %
Answer  Explanation 

ANSWER: 2 %

Explanation:
No explanation is available for this question!
9)   In a measurement system,

a. A single measurement components may have both random errors and systematic errors
b. A measurement system consists of several components with each component having separate errors
c. Both the statement (a) & (b) are true
d. Neither statement (a) nor statement (b) is true
Answer  Explanation 

ANSWER: Both the statement (a) & (b) are true

Explanation:
No explanation is available for this question!
10)   The error between mean of finite data set and mean of infinite data set is known as

a. True error of the mean
b. Standard error of the mean
c. Finite error
d. Infinite error
Answer  Explanation 

ANSWER: Standard error of the mean

Explanation:
No explanation is available for this question!
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