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Electrical Engineering
Electrical Machine Design
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Q.1
The cylindrical windings using circular conductors are used for current rating of
upto 20 A
upto 40 A
upto 60 A
upto 80 A
Q.2
The forced oil and air circulation method is usual one for transformers of capacities
upto 5 MVA
upto 10 MVA
upto 20 MVA
30 MVA upwards
Q.3
In an energy meter braking torque is produced to
safe guard it against creep
brake the instrument
bring energy meter to stand still
maintain steady speed and equal to driving torque
Q.4
In a portable instrument, the controlling torque is provided by
spring
gravity
eddy currents
all of the above
Q.5
In a meggar controlling torque is provided by
spring
gravity
coil
eddy current
Q.6
Operating torques in analogue instruments are
deflecting and control
deflecting and damping
deflecting, control and damping
vibration and balancing
Q.7
The principle on which vector voltmeter is based is
that it works on the principle of complex variation
that it measures the response of linear ramp voltage
same as digital meter
that it measures the amplitude of a single at two points and at the same time measures their phase difference
Q.8
A Weston frequency meter is
moving coil instrument
moving iron instrument
dynamometer instrument
none of the above
Q.9
Which of the following is the major consideration to evolve a good design ?
Cost
Durability
Compliance with performance criteria as laid down in specifications
All of the above
Q.10
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
single-phase winding
two-phase winding
three-phase winding
any of the above
Q.11
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
deflecting
controlling
damping
any of the above
Q.12
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
increase
decrease
either of the above
none of the above
Q.13
For measurement of mutual inductance we can use
Anderson bridge
Maxwell’s bridge
Heaviside bridge
Any of the above
Q.14
The slot leakage can be calculated by making which of the following assumptions ?
The current in the slot conductors is uniformly distributed over their cross-section
The leakage path is straight across the slot and around the iron at the bottom
The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
All of the above
Q.15
The stator of a D.C. machine comprises of
main poles
interpoles
frame
all of the above
Q.16
Cylindrical windings using circular conductors, employed in transformers, are
single layered
double layered
multi-layered
none of the above
Q.17
The ratio of maximum displacement deviation to full scale deviation of the instrument is called
static sensitivity
dynamic deviation
linearity
precision or accuracy
Q.18
Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
Increased I R losses
Increased core losses
Poor commutation
Change in motor parameters
All of the above
Q.19
A moving iron instrument can be used for
D.C. only
A.C. only
both D.C. and A.C.
neither D.C. and A.C.
Q.20
Machines cooled by direct cooling method may be called
supercharged
inner cooled
conductor cooled
any of the above
Q.21
In D.C. machines the usual limit of slot pitch is
between 5 to 10 mm
between 10 to 15 mm
between 15 to 20 mm
between 25 to 35 mm
Q.22
In a low power factor wattmeter the compensating coil is connected
in series with current coil
in parallel with current coil
in series with pressure coil
in parallel with pressure coil
Q.23
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as
small size machines
medium size machines
large size machines
any of the above
Q.24
In an Anderson bridge, the unknown inductance is measured in terms of
known inductance and resistance
known capacitance and resistance
known resistance
known inductance
Q.25
The pointer of an indicating instrument should be
very light
very heavy
either (A) or (B)
neither (A) nor (B)
Q.26
Electrical machines having a power output up to about 750 W may be called_______machines.
small size
medium size
large size
any of the above
Q.27
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
conduction
convection
radiation
any of the above
Q.28
In majority of instruments damping is provided by
fluid friction
spring
eddy currents
all of the above
Q.29
_______ instruments are those which measure the total quantity of electricity delivered in a particular time.
Absolute
Indicating
Recording
Integrating
Q.30
The desirable static characteristics of a measuring system are
accuracy and reproducibility
accuracy, sensitivity and reproducibility
drift and dead zone
static error
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