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Electrical Engineering
Electrical Machine Design
Quiz 7
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Q.1
The weight of copper of both armature and field windings decreases with _____ in number of poles.
increase
decrease
either of the above
none of the above
Q.2
Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
Absolute instruments
Indicating instruments
Recording instruments
Integrating instruments
Q.3
The density of hydrogen is _____ times the density of air.
0.07
1.5
2.5
3.5
Q.4
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
0°
60°
90°
120°
Q.5
With conventional hydrogen cooling it is possible to increase the rating of a single unit to
50 MW
100 MW
200 MW
none of the above
Q.6
In Weston synchronoscope the moving coil is connected across
bus-bars
incoming alternator
fixed coils
any of the above
Q.7
The winding where dummy coils are used is sometimes called
Duplex winding
Triplex winding
Forced winding
None of the above
Q.8
An instrument transformer is used to extend the range of
induction instrument
electrostatic instrument
moving coil instrument
any of the above
Q.9
The value of exciting or magnetizing current depends upon which of the following factors ?
Total m.m.f. required
The number of turns in the exciting winding
The way in which the winding is distributed
All of the above
Q.10
The voltage control in electric supply networks in required on account of which of the following reasons ?
Adjustment of voltage at consumers premises within statutory limits
Control of active and reactive power
Adjustment of short period daily and seasonal voltage variations in accordance with variations of load
All of the above
Q.11
D.C. machines designed with a large value of air gap length have
worst, ventilation
poor ventilation
better ventilation
none of the above
Q.12
_________ electromagnets generally function as holding magnets.
Tractive
Portative
Either of the above
None of the above
Q.13
Which of the following is the commonly used type of electromagnets ?
Flat-faced armature type
Horse shoe type
Flat-faced plunger type
All of the above
Q.14
The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.
air
hydrogen
either (A) or (B)
none of the above
Q.15
By which of the following methods the temperature rise of windings and other parts may be determined ?
Thermometer method
Resistance method
Embedded temperature detector method
Any of the above
Q.16
The function of shunt in an ammeter is to
by pass the current
increase the sensitivity of the ammeter
increase the resistance of ammeter
none of the above
Q.17
A phase shifting transformer is used in conjunction with
D.C. potentiometer
Drysdale potentiometer
co-ordinate potentiometer
Crompton potentiometer
Q.18
By which of the following methods motor rating for variable load drives can be determined ?
Method of average losses
Equivalent current method
Equivalent torque method
Equivalent power method
All of the above
Q.19
In direct cooled system using hydrogen both stator and rotor conductors are made
solid
hollow
perforated
any ofthe above
Q.20
On which of the following variables heat convected depends ?
Power density
Temperature difference between heated surface and coolant
Thermal resistivity, density, specific heat
Gravitational constant
All of the above
Q.21
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
10°
80°
120°
170°
Q.22
Is usually used for brush rockers
Mild steel
Copper
Aluminium
Cast-iron
Q.23
In D.C. machines the number of slots per pole usually lies
between 2 to 4
between 6 to 8
between 9 to 16
between 20 to 30
Q.24
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.25
Which of the following methods may be adopted to reduce the effects of armaturereaction ?
Increase in length of air gap at pole tips
Increasing reluctance of pole tips
Compensating windings
All of the above
Q.26
The operation of a D.C. machine with large air gap lengths is comparatively
quiet
noisy
either of the above
none of the above
Q.27
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.28
In D.C. machines, ir order to prevent excessive distortion of field form by the armaturereaction, the field mmf must be made
equal to that of armature mmf
less in comparison with the arma¬ture mmf
large in comparison with the arma-ture mmf
none of the above
Q.29
D.C. machines designed with a large value of air gap length have
worst, ventilation
poor ventilation
better ventilation
none of the above
Q.30
In D.C. machines the width of the duct is usually
4 mm
6 mm
8 mm
10 mm
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