Q.1
Instrument transformers are
Q.2
In order to achieve high accuracy, the slide wire of a potentiometer should be
Q.3
Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?
Q.4
Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to
Q.5
Various adjustments in an energy meter include
Q.6
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
Q.7
Which of the following methods may be adopted to reduce the effects of armature reaction?
Q.8
In D.C. machines the number of slots per pole usually lies
Q.9
Standard resistor is made from
Q.10
A dynamometer wattmeter can be used for
Q.11
Systematic errors are
Q.12
Helical windings are used in
Q.13
Murray loop test can be used for location of
Q.14
Tractive magnets are operated from
Q.15
The scale of a rectifier instrument is
Q.16
A direct current can be measured by
Q.17
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
Q.18
The laminations of the armature of a D.C. machine are usually _____ thick.
Q.19
For measurement of inductance having high value, we should use
Q.20
If an instrument has cramped scale for larger values, then it follows
Q.21
The resistivity of water should not be less than
Q.22
Which of the following in an application of D.C. motors?
Q.23
Most sensitive galvanometer is
Q.24
The gravity controlled instrument has crowded scale because current is proportional to
Q.25
Which of the following is an essential part of a motor meter ?
Q.26
Power transformers have rating
Q.27
Which of the following is the basic consideration in the design of insulation ?
Q.28
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
Q.29
Which of the following methods is most accurate ?
Q.30
D.C. servomotors are used in
0 h : 0 m : 1 s