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Monday, June 6, 2016

Measurements Instrumentation MCQ Questions Answers: Part-11

Measurements Instrumentation MCQ Questions Answers: Part-11

[1] The percentage limiting error, in the case of an instrument reading of 8.3V with a 0 to 150V voltmeter having a guaranteed accuracy of 1% full-scale reading is 
A) 1.810%
B) 0.181%
C) 0.0018%
D) 18.10%


[2] The induction of  a high Q inductor can be measured by a 
A) Schering Bridge
B) Hay Bridge
C) Maxwell Bridge
D) Wien Bridge


[3] If a DC voltmeter is made from an ammeter having a fed of 100μA then its sensitivity (in KΩ/V) will be
A) 1
B) 100
C) 10
D) 1000


Guidelines: Assertion (A) and Reason (R) type Questions 4 and 5:

(A) Both a and R are correct and R is explanation for A.
(B) Both a and R are correct and R is not explanation for A.
(C) A is true but R is false.
(D) A is false but R is true.


[4] A: The screen of a CRT is coated with phosphor on the inside.
      R: Phosphor absorbs the KE of the bombarding electrons and re-emits energy at a frequency in the visible region.

[5]  A: The Weign Bridge can be used for frequency measurements.
       B: The Weign Bridge uses only capacitors and resistors.



[6] It is desired to convert a 0-1000A meter movement, with an internal resistance of 100 ohms, into a 0-100mA meter. The required value of shunt resistance is about
A) 0.1 ohms
B) 1 ohms
C)  99 ohms
D) 100 ohms


[7] Match List I with List II:
                             List I                              List II
(a) Megger(p) Measurement of loss angle in a dielectric
(b) Spectrum analyzer(q) Measurement of frequency
(c) Schering bridge(r) Measurement of insulation resistance
(d) Digital counter(s) Measurement of harmonics



[8] In moving coil meters, damping is provided by
A) damping vane in the air tight chamber.
B) the aluminium frame of the coil.
C) eddy current disk.
D) The coil spring attached to the moving mechanism.


[9] A 0 to 300V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by the instrument is 83V. The percentage limiting error is 
A) 95%
B) 4.85%
C) 3.62%
D)1.81%

[10] An Aryton shunt is used to make a D'Arsonval galvanometer into a
A) single range voltmeter
B) single range ammeter
C) multi range ammeter
D) multi range voltmeter
1:18 AM

Saturday, April 30, 2016

Measurements Instrumentation Objective Type Questions Answers: Part-10

Measurements Instrumentation Objective Type Questions Answers: Part-10

[1] A 12 bit counter type A/D converter uses a 1 MHz clock. Its maximum conversion time is
A) 1 μs
B) 12μs
C) 4096μs
D) 4μs


[2] A 12 bit counter type A/D converter uses a 1 MHz clock. Its maximum conversion rate is
A) 106 conversions/sec
B) 244 conversions/sec
C) 488 conversions/sec
D) 83 kilo conversions/sec


[3] An 8 bit converter type A/D converter makes at least 8000conversions/sec. The clock frequency used is
A) 2MHz
B)  8MHz
C)  1MHz
D)  4MHz


[4] The conversion time of a 12 bit successive approximation A/D converter using a 1 MHz clock is 
A) 1 μs
B) 12μs
C) 4096μs
D) 4095μs


[5] The resolution of a 12 bit D/A converter using a binary ladder is 
A) 4096
B) 0.02%
C) 2.4%
D) 4%


[6] A 12 bit counter type A/D converter uses a 1 MHz clock. If the full scale output is +10V, its resolution output is
A) 2.44mV
B) 2.4mV
C) 0.02V
D) 0.02mV


[7] A 10 bit resistive divider is constructed such that the current through the LSB resistor is 100μA. The maximum current that will flow through the MSB resistor is  
A) 200μA.
B) 1mA
C) 51.2mA 
D) 102.4mA


[8] For a certain 4 bit successive approximation A/D converter, the maximum ladder output is +8V. if a constant +6V is applied to the analog input the sequence of binary states for the SA register is 
A) 1111
B) 1010
C) 0110
D) 1011


[9] In the case of power measurement by two wattmeter method in a balanced 3Φ system with a pure inductive load 
A) both the  Wattmeter will indicate the same but of opposite sign.
B) both the Wattmeters will indicate zero.
C) both the Wattmeters will indicate same value and of the same sign.
D) one Wattmeter will indicate zero and the other non-zero value.


[10] The sensitivity of an instrument is 
A) smallest increment in the output the can be detected with certainity.
B) largest input change to which the instrument fails to respond.
C) ratio of the change in the magnitude of the output to the corresponding change in the magnitude of the input.
D) closeness of the output values for repeated applications of a constant input.

Thanks for reading...
1:57 AM