Q.1
The permissible flux density in case of cold rolled grain oriented steel is around
Q.2
No-load current of a transformer has
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
Q.4
The noise produced by a transformer is termed as
Q.5
A no-load test is performed on a transformer to determine
Q.6
Which of the following parts of a transformer is visible from outside?
Q.7
The efficiency of a transformer, under heavy loads, is comparatively low because
Q.8
In a power or distribution transformer about 10 per cent end turns are heavily insulated
Q.9
Which winding in a transformer has more number of turns?
Q.10
Iron loss of a transformer can be measured by
Q.11
Efficiency of a power transformer is of the order of
Q.12
The complete circle diagram of induetion motor can be drawn with the help of data found from
Q.13
A common method of cooling a power transformer is
Q.14
A transformer can have zero voltage regulation at
Q.15
The secondary of a current transformer is always short-circuited under operating conditions because it
Q.16
Short circuit test on transformers is conducted to determine
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?
Q.18
The maximum load that a power transformer can carry is limited by its
Q.19
The hum in a transformer is mainly attributed to
Q.20
An ideal transformer is one which has
Q.21
Which of the following property is not necessarily desirable in the material for transformer core?
Q.22
Which of the following properties is not necessarily desirable for the material for transformer core?
Q.23
An open-circuit test on a transformer is conducted primarily to measure
Q.24
In a transformer the energy is conveyed from primary to secondary
Q.25
The voltage transformation ratio of a transformer is equal to the ratio of
Q.26
The 'cogging' of an induction motor can be avoided by
Q.27
Which of the following is not a part of transformer installation?
Q.28
Which winding of the transformer has less cross-sectional area?
Q.29
Which of the following acts as a protection against high voltage surges due to lightning and switching?
Q.30
The power factor of an induction motor under no-load conditions will be closer to
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