15. In moving coil instruments, scale used is
A. nonlinear scale
B. linear scale
C. square scale
D. logarithmic scale

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16. When an ac voltage is applied to a PMMC voltmeter
A. the meter gets damaged
B. meter reading is zero
C. pointer will oscillate to and fro
D. the pointer will not move at all

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17. The function of swamping resistor put in series with the moving coil of a moving coil meter is
A. to achieve full-scale sensitivity of the meter
B. to reduce the full-scale current
C. to increase the strength of the field
D. to compensate for transporative variations

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18. Frequency compensation in a moving iron instrument is achieved by connecting
A. a capacitor in series with the fixed coil
B. a capacitor across the fixed coil
C. high resistance in series with the coil
D. low resistance in series with the coil

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19. The advantage of electrodynamometer type of instruments is
A. low torque/weight ratio
B. large operating current
C. nonuniform scale
D. the coil being air cored, these instruments are free from hysteresis and eddy current errors

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20. The damping of ballistic glavanometer is kept very small
A. to make the system oscillating
B. in order to get large first deflection
C. in order to get small first deflection
D. to make the system critically damped

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21. If the current sensitivity of a galvanometer is increased, the voltage sensitivity
A. decreases
B. increases
C. remains unlatered
D. may increase or decrease

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