1) The spring which is used for producing controlling torque in indicating instruments are made up of materials which is / are
a. Non - magnetic
b. Not subjected to much fatigue
c. Low specific resistance and low temperature resistance coefficient
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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2) The scales of gravity controlled instruments are
a. Uniform
b. Non - uniform and cramped or crowded at the middle
c. Non - uniform and cramped or crowded at their lower ends
d. Non - uniform and cramped or crowded in the first half
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Answer
Explanation
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ANSWER: Non - uniform and cramped or crowded at their lower ends
Explanation:
No explanation is available for this question!
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3) Due to overdamping, the instrument will become
a. Slow
b. Lethargic
c. Fast
d. Both (a) and (b)
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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4) If the degree of damping of an instrument should be adjusted to a value which is sufficient to enable the pointer to rise quickly to its deflected position without overshooting is called as
a. Overdamped
b. Dead beat
c. Underdamped
d. None of these
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Answer
Explanation
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ANSWER: Dead beat
Explanation:
No explanation is available for this question!
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5) Damping torque is the torque which acts on
a. Stationary system of the instrument
b. Moving system of the instrument only when it is stationary
c. Moving system of the instrument only when it is moving
d. Stationary system of the instrument only when the moving system is moving
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Answer
Explanation
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ANSWER: Moving system of the instrument only when it is moving
Explanation:
No explanation is available for this question!
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6) A deflection of 90 degree is produced when a current of 10 A flows through the circuit and the torque of the ammeter vary as the square of the current through it. If a current of 8 A flows through it, then the deflection obtained when the instrument is spring controlled and when the instrument is gravity controlled are
a. 39.79 degree, 57.6 degree
b. 47.55 degree, 35.67 degree
c. 57.6 degree, 39.79 degree
d. 35.67 degree, 47.55 degree
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Answer
Explanation
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ANSWER: 57.6 degree, 39.79 degree
Explanation:
No explanation is available for this question!
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7) The gravity controlled instruments has to be kept
a. Vertical
b. Horizontal
c. Inclined at 45 degree
d. Inclined at 75 degree
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Answer
Explanation
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ANSWER: Vertical
Explanation:
No explanation is available for this question!
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8) In a gravity controlled type indicating instrument, the current flowing through the circuit is
a. Directly proportional to the cosine of angle of deflection
b. Directly proportional to the sine of angle of deflection
c. Directly proportional to the tan of the angle of deflection
d. Directly proportional to the angle of deflection
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Answer
Explanation
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ANSWER: Directly proportional to the sine of angle of deflection
Explanation:
No explanation is available for this question!
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9) In measuring instruments, spiral springs are provided to
a. Lead current
b. Produce controlling torque
c. Produce damping torque
d. Lead current and produce controlling torque
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Answer
Explanation
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ANSWER: Lead current and produce controlling torque
Explanation:
No explanation is available for this question!
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10) In a spring controlled type indicating instruments, if the controlling torque is equal to the deflecting torque then
a. Angle of deflection will be maximum
b. Current flowing through it will be maximum
c. Angle of deflection will be zero
d. Angle of deflection will be directly proportional to the current flowing through it
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Answer
Explanation
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ANSWER: Angle of deflection will be directly proportional to the current flowing through it
Explanation:
No explanation is available for this question!
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