The power factor of a single phase load can be calculated if the instruments available are
The power factor of a single phase load can be calculated if the instruments available are
In a low power factor wattmeter the pressure coil is connected
In a low power factor wattmeter the pressure coil is connected
________ is the common method of applying brushes to the commntator.
________ is the common method of applying brushes to the commntator.
Electrical machines having a power output up to about 750 W may be called_______machines.
Electrical machines having a power output up to about 750 W may be called_______machines.
_______ instruments are those which measure the total quantity of electricity delivered in a particular time.
_______ instruments are those which measure the total quantity of electricity delivered in a particular time.
Which of the following in an application of D.C. motors?
Which of the following in an application of D.C. motors?
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
are always double layer type.
are always double layer type.
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
In an energy meter braking torque is produced to
In an energy meter braking torque is produced to
The insulation between windings and grounded core and the insulation between the windings of the same phase is
The insulation between windings and grounded core and the insulation between the windings of the same phase is
In a D.C. machine the number of brush arms is _____ the number of poles.
In a D.C. machine the number of brush arms is _____ the number of poles.
A potentiometer may be used for
A potentiometer may be used for
The use of _____ instruments is merely confined within laboratories as standardizing instruments.
The use of _____ instruments is merely confined within laboratories as standardizing instruments.
A universal RLC bridge uses
A universal RLC bridge uses
Which of the following is the major consideration to evolve a good design ?
Which of the following is the major consideration to evolve a good design ?
Which of the following devices may be used for extending the range of instruments ?
Which of the following devices may be used for extending the range of instruments ?
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
For measuring current at high frequency we should use
For measuring current at high frequency we should use
________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
The principle on which vector voltmeter is based is
The principle on which vector voltmeter is based is
In an Anderson bridge, the unknown inductance is measured in terms of
In an Anderson bridge, the unknown inductance is measured in terms of
The cylindrical windings using circular conductors are used for current rating of
The cylindrical windings using circular conductors are used for current rating of
If an inductance is connected in one arm of bridge and resistances in the remaining three arms
If an inductance is connected in one arm of bridge and resistances in the remaining three arms
Resistances can be measured with the help of
Resistances can be measured with the help of
Which of the following is an advantage of hydrogen cooling?
Which of the following is an advantage of hydrogen cooling?
In a meggar controlling torque is provided by
In a meggar controlling torque is provided by
According to application, instruments are classified as
According to application, instruments are classified as
Power transformers have rating
Power transformers have rating
The scale of a rectifier instrument is
The scale of a rectifier instrument is
Alternating current is measured by
Alternating current is measured by
Which of the following methods is most accurate ?
Which of the following methods is most accurate ?
Basically a potentiometer is a device for
Basically a potentiometer is a device for
D.C. servomotors are used in
D.C. servomotors are used in
The resistivity of water should not be less than
The resistivity of water should not be less than
In a low power factor wattmeter the compensating coil is connected
In a low power factor wattmeter the compensating coil is connected
Commonly used standard capacitor is
Commonly used standard capacitor is
The high voltage winding is usually which of the following type ?
The high voltage winding is usually which of the following type ?
Impose limitation on design.
Impose limitation on design.
Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
A sensitive galvanometer produces large deflection for a
A sensitive galvanometer produces large deflection for a
In a D.C. machine the current per brush arm should not be more than
In a D.C. machine the current per brush arm should not be more than
Commonly used instruments in power system measurement are
Commonly used instruments in power system measurement are
The household energy meter is
The household energy meter is
The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?
The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
The action of electromagnetic machines can be related to which of the following basic principles ?
The action of electromagnetic machines can be related to which of the following basic principles ?
A power factor meter has
A power factor meter has
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
The desirable static characteristics of a measuring system are
The desirable static characteristics of a measuring system are
Which of the following meters are not used on D.C. circuits
Which of the following meters are not used on D.C. circuits
Helical windings are used in
Helical windings are used in
The pointer of an indicating instrument should be
The pointer of an indicating instrument should be
Cylindrical windings using circular conductors, employed in transformers, are
Cylindrical windings using circular conductors, employed in transformers, are
A direct current can be measured by
A direct current can be measured by
Which of the following are integrating instruments ?
Which of the following are integrating instruments ?
In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
Which of the following methods may be adopted to reduce the effects of armature reaction?
Which of the following methods may be adopted to reduce the effects of armature reaction?
Multilayer helical windings are commonly used in the transformers as high voltage windings
Multilayer helical windings are commonly used in the transformers as high voltage windings
The change in flux linkages can be caused in which of the following ways ?
The change in flux linkages can be caused in which of the following ways ?
Most sensitive galvanometer is
Most sensitive galvanometer is
For measurement of inductance having high value, we should use
For measurement of inductance having high value, we should use
Damping of the Ballistic galvanometer is made small to
Damping of the Ballistic galvanometer is made small to
If an instrument has cramped scale for larger values, then it follows
If an instrument has cramped scale for larger values, then it follows
Systematic errors are
Systematic errors are
The gravity controlled instrument has crowded scale because current is proportional to
The gravity controlled instrument has crowded scale because current is proportional to
Tractive magnets are operated from
Tractive magnets are operated from
Which of the following is the basic consideration in the design of insulation ?
Which of the following is the basic consideration in the design of insulation ?
In D.C. machines the usual limit of slot pitch is
In D.C. machines the usual limit of slot pitch is
For measuring a very high resistance we should use
For measuring a very high resistance we should use
The stator of a D.C. machine comprises of
The stator of a D.C. machine comprises of
An induction meter can handle current up to
An induction meter can handle current up to
The mcrease in heat dissipation by air blasts is due to increase in
The mcrease in heat dissipation by air blasts is due to increase in
In a portable instrument, the controlling torque is provided by
In a portable instrument, the controlling torque is provided by
The operation of a D.C. machine with large air gap lengths is comparatively
The operation of a D.C. machine with large air gap lengths is comparatively
A dynamometer wattmeter can be used for
A dynamometer wattmeter can be used for
Yokes with rectangular cross-section are used for
Yokes with rectangular cross-section are used for
For measurement of mutual inductance we can use
For measurement of mutual inductance we can use
The flash point of transformer oil should be higher than
The flash point of transformer oil should be higher than
Volt box is a component to
Volt box is a component to
Standard resistor is made from
Standard resistor is made from
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
Which of the following is an essential part of a motor meter ?
Which of the following is an essential part of a motor meter ?
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
The ratio of maximum displacement deviation to full scale deviation of the instrument is called
The ratio of maximum displacement deviation to full scale deviation of the instrument is called
Materials exhibiting zero value of resistivity are known as ______ .
Materials exhibiting zero value of resistivity are known as ______ .
Direct water cooling of rotor winding presents
Direct water cooling of rotor winding presents
A multirangq instrument has
A multirangq instrument has
In majority of instruments damping is provided by
In majority of instruments damping is provided by
Which of the following essential features is possessed by an indicating instrument ?
Which of the following essential features is possessed by an indicating instrument ?
The adjustment of position of shading bands, in an energy meter is done to provide
The adjustment of position of shading bands, in an energy meter is done to provide
Machines cooled by direct cooling method may be called
Machines cooled by direct cooling method may be called
A Weston frequency meter is
A Weston frequency meter is
A moving iron instrument can be used for
A moving iron instrument can be used for
Dummy coil should not be used in
Dummy coil should not be used in
The operating voltage of a meggar is about
The operating voltage of a meggar is about
_______ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
_______ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
The surge phenomenon is particularly important in case of
The surge phenomenon is particularly important in case of
Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
Operating torques in analogue instruments are
Operating torques in analogue instruments are
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
In a D.C. machine, the value of peripheral speed should not, normally, exceed
In a D.C. machine, the value of peripheral speed should not, normally, exceed
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
The laminations of the armature of a D.C. machine are usually _____ thick.
The laminations of the armature of a D.C. machine are usually _____ thick.
Disc windings are primarily used in
Disc windings are primarily used in
Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer
Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer
The forced oil and air circulation method is usual one for transformers of capacities
The forced oil and air circulation method is usual one for transformers of capacities
The power of a n-phase circuit can be measured by using a minimum of
The power of a n-phase circuit can be measured by using a minimum of
Is universally used for windings of electrical machines because it is easily workable without any possibility of
Is universally used for windings of electrical machines because it is easily workable without any possibility of
Which of the following brushes can be used for high values of current density ?
Which of the following brushes can be used for high values of current density ?
Which of the following properties a damping oil must possess ?
Which of the following properties a damping oil must possess ?
Murray loop test can be used for location of
Murray loop test can be used for location of
The slot leakage can be calculated by making which of the following assumptions ?
The slot leakage can be calculated by making which of the following assumptions ?
