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.Management Sciences
Category: Measurement and Instrumentation
A direct current can be measured by________________?
A. a D.C. potentiometer directly
B. a D.C. potentiometer in conjunction with a standard resistance
C. a D.C. potentiometer in conjunction with a volt ratio box
D. none of the above
In an energy meter 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
A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?
A. ammeter
B. voltmeter
C. flux-meter
D. ballistic galvanometer
A sensitive galvanometer produces large deflection for a_______________?
A. small value of current
B. large value of current
C. large value of power
D. large value of voltage
E. none of the above
An ohmmeter is a____________?
A. moving iron instrument
B. moving coil instrument
C. dynamometer instrument
D. none of the above
Which of the following meters are not used on D.C. circuits______________?
A. Mercury motor meters
B. Commutator motor meters
C. Induction meters
D. None of the above
A universal RLC bridge uses_________________?
A. Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance
B. Maxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance
C. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance
D. Any of the above
The gravity controlled instrument has crowded scale because current is proportional to________________?
A. balancing weight
B. deflection angle
C. sine of deflection angle
Which of the following devices may be used for extending the range of instruments ?
A. Shunts
B. Multipliers
C. Current transformers
D. Potential transformers
E. All of the above
The two pressure coils of a single phase power factor meter have_________________?
A. the same dimensions and the same number of turns
B. the same dimension but different number of turns
C. the same number of turns but different dimensions
D. none of the above
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