Q.1
The cylindrical windings using circular conductors are used for current rating of
Q.2
The forced oil and air circulation method is usual one for transformers of capacities
Q.3
In an energy meter braking torque is produced to
Q.4
In a portable instrument, the controlling torque is provided by
Q.5
In a meggar controlling torque is provided by
Q.6
Operating torques in analogue instruments are
Q.7
The principle on which vector voltmeter is based is
Q.8
A Weston frequency meter is
Q.9
Which of the following is the major consideration to evolve a good design ?
Q.10
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
Q.11
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
Q.12
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
Q.13
For measurement of mutual inductance we can use
Q.14
The slot leakage can be calculated by making which of the following assumptions ?
Q.15
The stator of a D.C. machine comprises of
Q.16
Cylindrical windings using circular conductors, employed in transformers, are
Q.17
The ratio of maximum displacement deviation to full scale deviation of the instrument is called
Q.18
Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
Q.19
A moving iron instrument can be used for
Q.20
Machines cooled by direct cooling method may be called
Q.21
In D.C. machines the usual limit of slot pitch is
Q.22
In a low power factor wattmeter the compensating coil is connected
Q.23
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as
Q.24
In an Anderson bridge, the unknown inductance is measured in terms of
Q.25
The pointer of an indicating instrument should be
Q.26
Electrical machines having a power output up to about 750 W may be called_______machines.
Q.27
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
Q.28
In majority of instruments damping is provided by
Q.29
_______ instruments are those which measure the total quantity of electricity delivered in a particular time.
Q.30
The desirable static characteristics of a measuring system are
0 h : 0 m : 1 s