Electrician paper

Q.35) In a CRO which of the following is not a part of electron gun..
A) cathode
B) grid
C) accelerating anode
D) X - Y plates
Answer: D) X - Y plates

Q.36) Which of the following instruments can be used to measure AC current only?
(i) Permanent Magnet Type ammeter
(ii) Induction type ammeter
(iii) Moving iron voltmeter
(iv) Moving iron ammeter
Answers:
A) iv only
B) ii only
C) i,ii,iv
D) ii and iv only
Answer: B) ii only

 Q.37) An oscilloscope indicates
(a) Peak to peak value of voltage
(b) DC value of voltage
(c) RMS value
(d) Average value
Answer: (a) Peak to peak value of voltage

Q.38) In a ballistic galvanometer, the deflecting torque is proportional to
(a) the current through coil
(b) square of current through coil
(c) square-root of current through coil
(d) sine of measured
Answer: (a) the current through coil

Q.39) The error of an instrument is normally given as a percentage of
(a) measured value
(b) full-scale value
(c) mean value
(d) rms value
Answer: (b) full-scale value

Q.40) If the instrument is to have a wide range, the instrument should have
(a) Linear scale
(b) Square-law scale
(c) Exponential scale
(d) Logarithmic scale
Answer: (d) Logarithmic scale

Q.41) The resistance can be measured most accurately by
(a) Voltmeter-ammeter method
(b) bridge method
(c) multimeter
(d) Megger
Answer: (b) bridge method

Q.42) The repeat accuracy of an instrument cgan be judged from its
(a) static error
(b) linearity error
(c) dynamic error
(d) standard deviation of error
Answer: (d) standard deviation of error

Q.43) Which of the following meters has a linear scale?
(a) Thermocouple meter
(b) Moving iron meter
(c) Hot wore meter
(d) Moving coil meter
Answer: (d) Moving coil meter

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