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Quiz 2
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Q.1
_______ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
Grey cast-iron
Cast steel
High carbon steel
Stainless steel
Q.2
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
0.1 Hz
0.25 Hz
0.5 Hz
1.5 Hz
Q.3
Dummy coil should not be used in
small machines
large machines
either (A) or (B)
none of the above
Q.4
The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?
Conduction
Convection
Radiation
All of the above
Q.5
The action of electromagnetic machines can be related to which of the following basic principles ?
Induction
Interaction
Alignment
All of the above
Q.6
Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
10 MW
30 MW
60 MW
150 MW
Q.7
The household energy meter is
an indicating instrument
a recording instrument
an integrating instrument
none of the above
Q.8
The flash point of transformer oil should be higher than
40°C
60°C
80°C
104°C
Q.9
Which of the following essential features is possessed by an indicating instrument ?
Deflecting device
Controlling device
Damping device
All of the above
Q.10
Multilayer helical windings are commonly used in the transformers as high voltage windings
upto 20 kV
upto 50 kV
upto 80 kV
for 110 kV and above
Q.11
Which of the following properties a damping oil must possess ?
Must be a good insulator
Should be non-evaporating
Should not have corrosive action upon the metal of the vane
The viscosity of the oil should not change with the temperature
All of the above
Q.12
In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
5 percent
10 percent
15 percent
30 percent
none of the above
Q.13
Which of the following devices may be used for extending the range of instruments ?
Shunts
Multipliers
Current transformers
Potential transformers
All of the above
Q.14
The operating voltage of a meggar is about
6 V
12 V
40 V
100 V
Q.15
Impose limitation on design.
Saturation
Temperature rise
Efficiency
Power factor
All above
Q.16
The surge phenomenon is particularly important in case of
low voltage transformers
medium voltage transformers
high voltage transformers
any of the above
Q.17
An induction meter can handle current up to
10 A
30 A
60 A
100 A
Q.18
Which of the following brushes can be used for high values of current density ?
Metal graphite brushes
Hard carbon brushes
Electro-graphitic brushes
Natural graphite brushes
Q.19
Which of the following is an advantage of hydrogen cooling?
Increase in efficiency
Increase in ratings
Increase in life
All of the above
Q.20
The insulation between windings and grounded core and the insulation between the windings of the same phase is
minor insulation
major insulation
either of the above
none of the above
Q.21
Commercial available medium size machines have a speed range of ______ .
200 to 400 r.p.m.
600 to 1000 r.p.m.
1000 to 1500 r.p.m.
2000 to 2500 r.p.m.
Q.22
The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are
0.5 to 0.8 Wb/m²
0.8 to 1.0 Wb/m²
1.1 to 1.35 Wb/m²
1.4 to 1.8 Wb/m²
Q.23
An induction wattmeter can be used for
both D.C. and A.C.
D.C. only
A.C. only
any of the above
Q.24
For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
1.0 to 1.2 A/mm²
1.5 to 2.0 A/mm²
2.2 to 3.2 A/mm²
3.2 to 4.2 A/mm²
Q.25
If an insulating material is operated beyond the maximum allowable temperature, its life is
drastically increased
drastically reduced
unaffected
none of the above
Q.26
The electrical power to a meggar is provided by
battery
permanent magnet D.C. generator
A.C. generator
any of the above
Q.27
In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made
equal to that of armature mmf
less in comparison with the armature mmf
large in comparison with the armature mmf
none of the above
Q.28
Basically a potentiometer is a device for
comparing two voltages
measuring a current
comparing two currents
measuring a voltage
none of the above
Q.29
A potentiometer may be used for
measurement of resistance
measurement of current
calibration of ammeter
calibration of voltmeter
all of the above
Q.30
The rectifier instrument is not free from
temperature error
wave shape error
frequency error
all of the above
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