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1.0.0
MCQ
4321. The absolute measurement of resistance is done by-
Ohm's law method
Bridge method
Rayleigh method
Lorenz method
4322. An ohmmeter is an instrument for measuring-
current
resistance
voltage
wattage
4323. Most sensitive galvanometer is-
Elastic galvanometer
Vibration galvanometer
Duddlb galvanometer
Spot ballistic galvanometer
4324. The chemical effect of current is used in---
DC ammeter hour meter
DC ammeter
DC energy meter
None of the above
4325. In a portable instrument, the controlling torque is provided by--
Spring
Eddy currents
Gravity
All of the above
4326. To measure the flux, devices used are based on-
Voltaic effect
Hall effect
Piezo-clectric effect
Photo-voltaic effect
4327. No eddy current and hysteresis losses occur in-
Electrostatic instruments
PMMC instruments
Moving iron instruments
Electrodynamo meter instruments
4328. The resistance can be measured most accurately by-
Voltmeter-ammeter method
Bridge method
Multimeter
Megger
4329. In a moving iron meter, the deflecting torque is proportional to--
Current through the coil
Square of the current through the coil
Sine of the measurand
Square root of the measurand
4330. A megger is usually-
Moving iron type instrument
Electro-static type instrument
Hot-wire type instrument
Moving coil type instrument
4331. The spring material used in a spring control device should have the following property---
Should be non-magnetic
Most be of low temperature coefficient
Should have low specific resistance
All of the above
4332. Resistances can be measured with the help of-
Watt-meters
Voltmeters
Ammeters
Ohmmeters and resistance bridges
4333. An instrument transformer is used to extend the range of-
Induction instrument
Electrostatic instrument
Moving coil instrument
Any of the above
4334. A direct current can be measured by-
AD.C. potentiometer directly
A D.C. potentiometer in conjunction with a standard resistance
A D.C. potentiometer in conjunction with a volt ratio box
None of the above
4335. The two pressure coils of a single phase power factor meter have---
The same dimensions and the same number of turns
The same dimension but different number of turns
The same number of turns but different dimensions
None of the above
4336. A moving iron ammeter may be compensated for frequency errors by-
A shunt resistance
Shunt capacitance
A series inductance
Series resistance
4337. An ohmmeter is a---
Moving iron instrument
Moving coil instrument
Dynamometer instrument
None of the above
4338. The multiplier and the meter coil in a voltmeter are in-
Series
Parallel
Series-parallel
None of the above
4339. If the cross-sectional area of a magnetic field increases, but the flux remains—
the same,
the increases
decreases
none
ব্যাখ্যা: We know, B A If area is increases flux density will be decreases because they are inversely proportional to each other.
4340. A dynamometer wattmeter can be used for-
DC only
AC only
Both DC and AC
Any of the above