Quiznetik
Measurement and Instrumentation | Set 2
1. An instrument transformer is used to extend the range of
A. induction instrument
B. electrostatic instrument
C. moving coil instrument
D. any of the above
Correct : A. induction instrument
2. Wattmeter cannot be designed on the principle of
A. electrostatic instrument
B. thermocouple instrument
C. moving iron instrument
D. electrodynamic instrument
Correct : C. moving iron instrument
3. In an energymeter braking torque is produced to
A. safe guard it against creep
B. brake the instrument
C. bring energy meter to stand still
D. maintain steady speed and equal to driving torque
Correct : D. maintain steady speed and equal to driving torque
4. Various adjustments in an energy meter include
A. light load or friction
B. lag and creep
C. overload and voltage compensation
D. all of the above
Correct : D. all of the above
5. The power of a n-phase circuit can be measured by using a minimum of
A. (n - 1) wattmeter elements
B. n wattmeter elements
C. (n + 1) wattmeter elements
D. 2n wattmeter elements
Correct : A. (n - 1) wattmeter elements
6. Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to
A. improve its ventilation
B. eliminate creeping at no load
C. increase its deflecting torque
D. increase its braking tcrque
Correct : B. eliminate creeping at no load
7. Which of the following is measured by using a vector voltmeter ?
A. Amplifier gain and phase shift
B. Filler transfer functions
C. Complex insersion loss
D. All of the above
Correct : D. All of the above
8. The principle on which vector voltmeter is based is
A. that it works on the principle of complex variation
B. that it measures the response of linear ramp voltage
C. same as digital meter
D. that it measures the amplitude of a single at two points and at the same time measures their phase difference
Correct : D. that it measures the amplitude of a single at two points and at the same time measures their phase difference
9. To measure radio frequency, the suitable frequency meter is
A. Weston frequency meter
B. reed vibrator frequency meter
C. hetrodyne frequency meter
D. electrical resonance frequency meter
Correct : C. hetrodyne frequency meter