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Electrical Engineering
Transformers
Quiz 4
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Q.1
The permissible flux density in case of cold rolled grain oriented steel is around
1.7 Wb/m²
2.7 Wb/m²
3.7 Wb/m²
4.7 Wb/m²
Q.2
No-load current of a transformer has
has high magnitude and low power factor
has high magnitude and high power factor
has small magnitude and high power factor
has small magnitude and low power factor
Q.3
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of
less than 15 A
more than 15 A
15 A
none of the above
Q.4
The noise produced by a transformer is termed as
zoom
hum
ringing
buzz
Q.5
A no-load test is performed on a transformer to determine
core loss
copper loss
efficiency
magnetising current
magnetising current and loss
Q.6
Which of the following parts of a transformer is visible from outside?
Bushings
Core
Primary winding
Secondary winding
Q.7
The efficiency of a transformer, under heavy loads, is comparatively low because
copper loss becomes high in proportion to the output
iron loss is increased considerably
voltage drop both in primary and secondary becomes large
secondary output is much less as compared to primary input
Q.8
In a power or distribution transformer about 10 per cent end turns are heavily insulated
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to absorb the line surge voltage and save the winding of transformer from damage
to reflect the line surge and save the winding of a transformer from damage
none of the above
Q.9
Which winding in a transformer has more number of turns?
Low voltage winding
High voltage winding
Primary winding
Secondary winding
Q.10
Iron loss of a transformer can be measured by
low power factor wattmeter
unity power factor wattmeter
frequency meter
any type of wattmeter
Q.11
Efficiency of a power transformer is of the order of
100 per cent
98 per cent
50 per cent
25 per cent
Q.12
The complete circle diagram of induetion motor can be drawn with the help of data found from
noload test
blocked rotor test
stator resistance test
all of the above
Q.13
A common method of cooling a power transformer is
natural air cooling
air blast cooling
oil cooling
any of the above
Q.14
A transformer can have zero voltage regulation at
leading power factor
lagging power factor
unity power factor
zero power factor
Q.15
The secondary of a current transformer is always short-circuited under operating conditions because it
avoids core saturation and high voltage induction
is safe to human beings
protects the primary circuit
none of the above
Q.16
Short circuit test on transformers is conducted to determine
hysteresis losses
copper losses
core losses
eddy current losses
Q.17
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?
0 W
14.1 W
111.5 W
1,020 W
Q.18
The maximum load that a power transformer can carry is limited by its
temperature rise
dielectric strength of oil
voltage ratio
copper loss
Q.19
The hum in a transformer is mainly attributed to
load changes
oil in the transformer
magnetostriction
mechanical vibrations
Q.20
An ideal transformer is one which has
no losses and magnetic leakage
interleaved primary and secondary windings
a common core for its primary and secondary windings
core of stainless steel and winding of pure copper metal
Q.21
Which of the following property is not necessarily desirable in the material for transformer core?
Mechanical strength
Low hysteresis loss
High thermal conductivity
High permeability
Q.22
Which of the following properties is not necessarily desirable for the material for transformer core?
Low hysteresis loss
High permeability
High thermal conductivity
Adequate mechanical strength
Q.23
An open-circuit test on a transformer is conducted primarily to measure
insulation resistance
copper loss
core loss
total loss
Q.24
In a transformer the energy is conveyed from primary to secondary
through cooling coil
through air
by the flux
none of the above
Q.25
The voltage transformation ratio of a transformer is equal to the ratio of
primary turns to secondary turns
secondary current to primary current
secondary induced e.m.f. to primary induced e.m.f.
secondary terminal voltage to primary applied voltage
Q.26
The 'cogging' of an induction motor can be avoided by
proper ventilation
using DOL starter
auto-transformer starter
having number of rotor slots more or less than the number of stator slots (not equal)
Q.27
Which of the following is not a part of transformer installation?
Conservator
Breather
Buchholz relay
Exciter
Q.28
Which winding of the transformer has less cross-sectional area?
Primary winding
Secondary winding
Low voltage winding
High voltage winding
Q.29
Which of the following acts as a protection against high voltage surges due to lightning and switching?
Horn gaps
Thermal overload relays
Breather
Conservator
Q.30
The power factor of an induction motor under no-load conditions will be closer to
0.2 lagging
0.2 leading
0.5 leading
unity
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