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.Management Sciences
Category: Measurement and Instrumentation
Most common form of A.C. meters met with in every day domestic and industrial installations are______________?
A. mercury motor meters
B. commutator motor meters
C. induction type single phase energy meters
D. all of the above
In Weston synchronoscope the moving coil is connected across______________?
A. bus-bars
B. incoming alternator
C. fixed coils
D. any of the above
In a portable instrument, the controlling torque is provided by_____________?
A. spring
B. gravity
C. eddy currents
D. all of the above
The electrical power to a meggar is provided by________________?
A. battery
B. permanent magnet D.C. generator
C. AC. generator
D. any of the above
In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?
A. unity
B. 0.8 lagging
C. 0.8 leading
D. zero
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
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
A moving-coil permanent-magnet instrument can be used as flux-meter_____________?
A. by using a low resistance shunt
B. by using a high series resistance
C. by eliminating the control springs
D. by making control springs of large moment of inertia
In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?
A. parallel
B. perpendicular
C. inclined at 60°
D. inclined at 120°
In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?
A. as long as possible
B. as short as possible
C. neither too small not too large
D. very thick
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