The internal resistance of an ammeter should be
The internal resistance of an ammeter should be
The EMF of Weston standard cell is measured using
The EMF of Weston standard cell is measured using
The repeat accuracy of an instrument can be judged from its
The repeat accuracy of an instrument can be judged from its
In a moving coil instrument, the deflecting torque is proportional to
In a moving coil instrument, the deflecting torque is proportional to
Ampere is one of the
Ampere is one of the
A moving iron ammeter may be compensated for frequency errors by
A moving iron ammeter may be compensated for frequency errors by
A 10MHz CRO has
A 10MHz CRO has
A permanent magnet moving coil ammeter has a coil resistance of 99ohm and Full Scale DeflectionFSD. current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is
A permanent magnet moving coil ammeter has a coil resistance of 99ohm and Full Scale DeflectionFSD. current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is
A galvanometer has
A galvanometer has
A mulliammeter can be used as
A mulliammeter can be used as
The multiplier and the meter coil in a voltmeter are in
The multiplier and the meter coil in a voltmeter are in
Which meter is suitable for the measurement of 10mV at 50MHz?
Which meter is suitable for the measurement of 10mV at 50MHz?
In a ballistic galvanometer, the deflecting torque is proportional to
In a ballistic galvanometer, the deflecting torque is proportional to
An instrument to be used for measurement and control should preferably have
An instrument to be used for measurement and control should preferably have
PMMC type instruments normally use
PMMC type instruments normally use
Some wire- wound resistors have bifilar winding. This type of winding is used to
Some wire- wound resistors have bifilar winding. This type of winding is used to
The absolute measurement of resistance is done by
The absolute measurement of resistance is done by
The chemical effect of current is used in
The chemical effect of current is used in
The two pressure coils of a single phase power factor meter have
The two pressure coils of a single phase power factor meter have
The resistance can be measured most accurately by
The resistance can be measured most accurately by
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
No eddy current and hysteresis losses occur in
No eddy current and hysteresis losses occur in
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
Electrostatic instruments are normally used for
Electrostatic instruments are normally used for
In a gravity controlled instrument, the deflection angle is proportional
In a gravity controlled instrument, the deflection angle is proportional
Which of the following meters has a linear scale?
Which of the following meters has a linear scale?
The problem of Electrostatic coupling in a transformer is acute at
The problem of Electrostatic coupling in a transformer is acute at
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
Which of the following devices should be used for accurate measurement of low D.C. voltage?
Which of the following devices should be used for accurate measurement of low D.C. voltage?
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
When using ohmmeter, applied voltage is to be disconnected from the circuit because
When using ohmmeter, applied voltage is to be disconnected from the circuit because
In a moving iron meter, the deflecting torque is proportional to
In a moving iron meter, the deflecting torque is proportional to
The spring material used in a spring control device should have the following property.
The spring material used in a spring control device should have the following property.
Ryall crest voltmeter is used for measurement of
Ryall crest voltmeter is used for measurement of
A megger is usually
A megger is usually
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
A CRO can display
A CRO can display
The error of an instrument is normally given as a percentage of
The error of an instrument is normally given as a percentage of
Wagner earthing device is used to eliminate errors due to
Wagner earthing device is used to eliminate errors due to
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads
An oscilloscope indicates
An oscilloscope indicates
A megger is usually
A megger is usually
Direct method is used to measure
Direct method is used to measure
The form factor in AC is the ratio of
The form factor in AC is the ratio of
To measure the flux, devices used are based on
To measure the flux, devices used are based on
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
Which wave has the least form factor?
Which wave has the least form factor?
It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?
It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?
For handling greater currents induction watt-meters are used in conjunction with
For handling greater currents induction watt-meters are used in conjunction with
Why is a MISC meter not recommended for DC measurement?
Why is a MISC meter not recommended for DC measurement?
