made easy online test series e&m-1
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SCORE CARD TIME MANAGEMENT QUESTIONS REPORT SOLUTION
Solution Report For Electrical & Electronics Measurements :Basic LevelRepresent whole test solution with correct and incorrect answers.
View Your Test Analysis
Q.No
Question Status
Q.1
Attempt Incorrect Your Ans. a Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A, I2 =
150 ± 2A, where the limits of error are given as standard deviations. I ismeasured as
a. (300 ± 1.24) Ab. (300 ± 1.73) Ac. (300 ± 2) A
d. (300 ± 2.24) A
Q.2
Attempt Incorrect Your Ans. c Correct Ans. bSolutionHave any doubt?FAQ?Video Solution
Rectifier type instrument can measure
a. AC only
b. Both DC and AC
c. DC onlyd. Pulsating quantities only
Q.3
REPORTS
NEWS
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Attempt Correct Correct Ans. bSolutionHave any doubt?FAQ?Video Solution
A PMMC instrument produces a deflection of 90° when a current of 2 mApasses through its moving coil. The instrument is spring controlled. Now,the instrument is redesigned with its spring constant as before and itspermanent magnet is replaced with a new permanent magnet whichproduces twice the flux density as before. What would be the deflection,if a current of 1 mA is passed through the coil? The other features of thePMMC instrument remain the same
a. 180°
b. 90°c. 45°d. 135°
Q.4
Attempt Incorrect Your Ans. a Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
A Wien bridge is used to measure the frequency of an input signal. Thesignal is : 5 sin 400πt + 0.75 sin 1200 πt (t in sec). The signal has 15% of
3rd harmonics. With this signal balance will
a. lead to null indication and setting corresponds to 400 Hzb. lead to null indication and setting corresponds to 1200 Hzc. lead to null indication and setting corresponds to 600 Hz
d. not lead to null indication
Q.5
Not Attempt Correct Ans. aSolutionHave any doubt?FAQ?Video Solution
An electrodynometer wattmeter measures power in a 1φ circuit. Loadvoltage is 230 V and current is 5 A at a lagging p.f. of 0.1. Wattmeterpotential coil circuit resistance is 10 kΩ and inductance is 100 mH. Thepercentage error in the measurement in power will be (f = 50 Hz)
a. 3.13 %b. 3.70 %c. 4 %d. 2.5 %
Q.6
The ac bridge shown below is used to measure an impedance z. Thebridge is in balanced condition. The impedance Z is equal to
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Attempt Correct Correct Ans. cSolutionHave any doubt?FAQ?Video Solution
a. series combination of a resistor and an inductorb. parallel combination of a resistor and an inductor
c. series combination of a resistor and a capacitord. parallel combination of a resistor and a capacitor
Q.7
Attempt Incorrect Your Ans. b Correct Ans. aSolutionHave any doubt?FAQ?Video Solution
The bridge method commonly used for finding mutual inductance is
a. Heaviside Campbell bridge
b. Schering bridgec. De Sauty bridged. Wien bridge
Q.8
Attempt Correct Correct Ans. bSolutionHave any doubt?FAQ?Video Solution
A d.c. potentiometer is designed to measure up to about 2 V with a slidewire of 800 mm. A standard cell of emf 1.18 V obtains balance at 600mm. A test cell is seen to obtain balance at 680 mm. The emf of the testcell is
a. 1.00 V
b. 1.34 Vc. 1.50 Vd. 1.70 V
Q.9
SAR type analog to digital converter has a resolution of 20 mV. What willbe the digital output for an analog input of 2.16 V ?
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Attempt Incorrect Your Ans. b Correct Ans. aSolutionHave any doubt?FAQ?Video Solution
a. 01101100
b. 01101011c. 01101101d. none of these
Q.10
Attempt Incorrect Your Ans. 2 Correct Ans. 9.06 (9.00 9.50)SolutionHave any doubt?FAQ?Video Solution
The reading of an electrodynamometer ammeter when a current
is passed through it, will be _________ A.
Q.11
Attempt Incorrect Your Ans. 1 Correct Ans. 3.5 (3.45 3.55)SolutionHave any doubt?FAQ?Video Solution
A half wave rectifier type instrument 0–1 V is to be used for the voltagerange of 010 V. _____ kΩ is the value of multiplier resistance, if fullscale deflection is 1 mA. Neglect diode resistance i.e. (rd = 0).
Q.12
Attempt Incorrect Your Ans. 33.33 Correct Ans.6.25 (6.20 6.30)
SolutionHave any doubt?FAQ?Video Solution
A voltmeter reading 80 V on its 100 V range and an ammeter reading 80mA on its 150 mA range, are used to determine the power dissipated in aresistor. Both these instruments are guaranteed to be accurate within±2%, at full scale deflection. The limiting error in the measurement of thepower dissipation is ________ %.
Q.13
Attempt Incorrect Your Ans. 0.22 Correct Ans.0.045 (0.041 0.047)
SolutionHave any doubt?FAQ?Video Solution
A set of independent current measurement taken by four observers wasrecorded as: 115.02 mA, 115.11 mA, 115.08 mA and 115.04 mA. ±_______ mA will be the average range of error.
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Q.14
Not Attempt Correct Ans. 2 (1.90 2.0)SolutionHave any doubt?FAQ?Video Solution
In a thermocouple based instrument, if 20% harmonic is present then theerror in the current reading is _______ %.
Q.15
Attempt Incorrect Your Ans. 875 Correct Ans. 8SolutionHave any doubt?FAQ?Video Solution
A digitaltoanalog converter with a fullscale output voltage of 3.5 V hasa resolution close to 14 mV. Its bit size is ________ .
Q.16
Not Attempt Correct Ans. 3.14 (3.10 3.20)SolutionHave any doubt?FAQ?Video Solution
An ac bridge shown below has the following specifications:C1 = 0.5 μF and R1 = 1 kΩ, R2= 2 kΩ, C3 = 0.5 μF.
If the supply frequency is 1 kHz, _______ will be the dissipation factor.
Q.17
Attempt Correct Correct Ans. bSolutionHave any doubt?FAQ?Video Solution
An energy meter rated as 5 A, 230 V makes 500 revolutions per kWh. Ifin a test at full load unity power factor, it makes 5 revolutions in 30seconds. Then which of the following statement is true?
a. The meter runs faster and error is 4.16%
b. The meter runs faster and error is 4.35%c. The meter runs slower and error is 4.16%d. The meter runs slower and error is 4.35%
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Q.18
Attempt Correct Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
Figure shown below is the circuit of a capacitance comparison bridge. IfR1 = 20 Ω, R2 = 30 R3 = 25 Ω and C3 = 10 pF than the value of Rx and Cxare respectively
a. 27.5 Ω, 26/3 pFb. 30.5 Ω, 28/3 pFc. 35.5 Ω, 22/3 pF
d. 37.5 Ω, 20/3 pF
Q.19
Attempt Incorrect Your Ans. c Correct Ans. aSolutionHave any doubt?FAQ?Video Solution
Two 100 μA full scale PMMC meters are employed to construct a 10 Vand 100 V full scale voltmeter. These meters will have figures of merit(sensitivities) as
a. 10 kΩ/V and 10 kΩ/Vb. 100 kΩ/V and 10 kΩ/V
c. 10 kΩ/V and 100 kΩ/Vd. 10 kΩ/V and 1 kΩ/V
Q.20
Attempt Correct Correct Ans. d
The power flowing in a 3φ, 3 wire balanced load system is measured bythe two wattmeter method. The reading of wattmeter A is 500 watts andwattmeter B is –100 watts.The power factor of the system is
a. 0.866b. 0.707c. 0.567
d. 0.359
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SolutionHave any doubt?FAQ?Video Solution
Q.21
Attempt Incorrect Your Ans. c Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
The current passing through a 10 ohm resistor in figure1, has thewaveform shown in figure2. The reading of the moving iron voltmeterconnected across the resistor is
a. 0 Vb. 75 V
c. 85 V
d. 92 V
Q.22
Not Attempt Correct Ans. aSolutionHave any doubt?FAQ?Video Solution
A Wheatstone bridge is shown in figure below.If P = 2 kΩ, R = 2 kΩ, S = 5 kΩ, G = 100 Ω, Ecd = 24 mV and galvanometer
current Ig = 13.6 μA, the value of Q is
a. 0.2688 kΩb. 0.2466 kΩc. 0.2966 kΩd. 0.231 kΩ
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Q.23
Attempt Incorrect Your Ans. c Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
A thermocouple instrument reads 10 A at full scale. The current at whichit reads 1/3 rd of its full scale is
a. 3.33 Ab. 5 A
c. 6.66 A
d. 5.77 A
Q.24
Not Attempt Correct Ans. dSolutionHave any doubt?FAQ?Video Solution
The inductance of a moving iron instrument is given by:
L = (10 + 5θ – θ2)μHwhere θ is the deflection in radian from zero position. The spring
constant is 12 × 10–6 Nm/rad. Estimate the deflection for a current of 5A.
a. 93.8°b. 94.8°c. 95.8°
d. 96.8°
Q.25
Attempt Correct Correct Ans. bSolutionHave any doubt?FAQ?Video Solution
The wattmeter commonly used for power measurement at commercialfrequencies is of the Xtype. This meter consists of two coil systems, thefixed system being the Ycoil and moving system being the Zcoil. Here,X, Y and Z respectively stands for
a. dynamometer, voltage and current
b. dynamometer, current and voltagec. induction meter, voltage and currentd. induction meter, current and voltage
Q.26
For an electrodynamometer ammeter. The mutual inductance M varieswith deflection θ(θ is in degree) as M = – 6 cos (θ + 45°) mH.For a direct current of 50 mA corresponding to a deflection of 60°, thedeflecting torque will be _____ μNm .
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Attempt Incorrect Your Ans. 5 Correct Ans.14.49 (14.40 14.50)
SolutionHave any doubt?FAQ?Video Solution
Q.27
Attempt Incorrect Your Ans. 15 Correct Ans. 648 (640 655)SolutionHave any doubt?FAQ?Video Solution
In a moving coil instrument, the moving coil consists of 100 turns woundon a square former of length 3 cm. The flux density in the air gap is 0.06
T. _____ × 10–7 Nm is the turning moment acting on the coil whencarrying a current of 12 mA.
Q.28
Attempt Incorrect Your Ans. 0.66 Correct Ans.1.06 (1.00 1.09)
SolutionHave any doubt?FAQ?Video Solution
A current of i = 0.5 + 0.3 sinωt – 0.2 sin 2ωt A is passed through thecircuit shown in figure given below. _____ ampere is the sum of reading
of each instruments. (Take ω = 106 rad/s)
Q.29
Attempt Incorrect Your Ans. 800 Correct Ans. 431 (430 432)SolutionHave any doubt?FAQ?Video Solution
A voltage: 100 sinωt + 60 cos (3ωt – 30°) + 40 sin(5ωt + 45°)V is appliedto the pressure coil circuit of a wattmeter and through the current coil acurrent of 8 sinωt + 6 sin (5ωt + 120°)A is passed. Reading of thewattmeter will be _______ W.
Q.30
A conventional rectifier type ac voltmeter (generally has a fullwavebridge circuit with a PMMC meter calibrated in rms values) is used tomeasure a voltage given by
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Not Attempt Correct Ans. 17 (16 18)SolutionHave any doubt?FAQ?Video Solution
v(t) = V0 + 10 sin 314t volts
_______ volt will be the reading of the meter for V0 = 10 volts (assume
no diode drop and neglecting cutin voltage).
Q.31
Attempt Incorrect Your Ans. 00 Correct Ans.33.33 (33.30 33.40)
SolutionHave any doubt?FAQ?Video Solution
In the circuit shown below, voltage is measured by a voltmeter having asensitivity of 20 kΩ/volt and using the 10volt range. – _______ % will beerror in the measurement.
Q.32
Attempt Incorrect Your Ans. 1 Correct Ans. 3SolutionHave any doubt?FAQ?Video Solution
Suppose that resistor R1 and R2 are connected in parallel to give an
equivalent resistance R. If resistor R1 and R2 have tolerance of 1%
each, the equivalent resistance R for R1 = 200 Ω and R2 = 100 Ω will
have tolerance of ________ %.
Q.33
The sawtooth voltage waveform shown in the figure is fed to a movingiron meter. Its reading will be _______ A.
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Not Attempt Correct Ans. 4.082 (4.00 4.10)SolutionHave any doubt?FAQ?Video Solution