Essentials Of Indicating Instrument - 2 - MCQs with answers

Essentials Of Indicating Instrument - 2 - MCQs with answers

Q1. 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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Q2. 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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Q3. 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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Q4. 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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Q5. 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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Q6. 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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Q7. 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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Q8. 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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Q9. Due to overdamping, the instrument will become

A. Slow
B. Lethargic
C. Fast
D. Both (a) and (b)

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Q10. The damping force in an instrument can be produced by air friction, eddy currents and fluid friction. Which among the three is most efficient?

A. Air friction
B. Eddy current
C. Fluid friction
D. All are equally efficient

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Q11. The time response of an indicating instrument is determined from the

A. Damping torque
B. Controlling torque
C. Deflecting torque
D. All of these

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