To measure radio frequency, the suitable frequency meter is_______________?
(A) Weston frequency meter
(B) reed vibrator frequency meter
(C) heterodoxy frequency meter
(D) electrical resonance frequency meter
Wattmeter cannot be designed on the principle of_________________?
(A) electrostatic instrument
(B) thermocouple instrument
(C) moving iron instrument
(D) electrodynamic instrument
Alternating current is measured by_______________?
(A) induction ammeter
(B) permanent magnet type ammeter
(C) electrostatic ammeter
(D) moving iron repulsion type voltmeter
Damping of the Ballistic galvanometer is made small to_______________?
(A) get first deflection large
(B) make the system oscillatory
(C) make the system critically damped
(D) get minimum overshoot
The desirable static characteristics of a measuring system are______________?
(A) accuracy and reproducibility
(B) accuracy, sensitivity and reproducibility
(C) drift and dead zone
(D) static error
Systematic errors are_________________?
(A) instrumental errors
(B) environmental errors
(C) observational errors
(D) all of the above
E.m.f. of a Weston cell is accurately measured by________________?
(A) electrostatic voltmeter
(B) hot wire voltmeter
(C) isothermal voltmeter
(D) electrodynamic voltmeter
Operating torques in analogue instruments are_______________?
(A) deflecting and control
(B) deflecting and damping
(C) deflecting, control and damping
(D) vibration and balancing
If an instrument has cramped scale for larger values, then it follows________________?
(A) square law
(B) logarithmic law
(C) uniform law
(D) none of the above