Equivalent Circuit of Transformer

The components needed to draw the phasor diagram of the transformer is
A. load current, B. Equivalent circuit parameters, C. Load power factor

In a transformer if the frequency of the supply is varied then the magnetizing current in the core also varies.

A 20KVA, 2200/220 V, 50 Hz single phase transformer has the below parameters:
HV : r = 2.4 ‎Ω, X=6 ‎Ω, Primary
LV: r = 0.03 ‎Ω, X = 0.07 ‎Ω, Secondary
The secondary reactance referred to primary is

A 20KVA, 2200/220 V, 50 Hz single phase transformer has the below parameters:
HV : r = 2.4 ‎Ω, X=6 ‎Ω
LV: r = 0.03 ‎Ω, X = 0.07 ‎Ω
The secondary resistance referred to primary is

In a transformer ______ decreases with increase of the leakage flux.

I. Core flux – Depends on applied voltage
II. Leakage flux – Depends on winding current
Which of the above two are not matched correctly?

There are two identical transformers A and B such that flux density applied to B is doubled. Then magnetizing current of B is

A 20KVA, 2200/220 V, 50 Hz single phase transformer has the below parameters:
HV : r = 2.4 ‎Ω, X=6 ‎Ω
LV: r = 0.03 ‎Ω, X = 0.07 ‎Ω
The primary reactance referred to secondary is

A 20KVA, 2200/220 V, 50 Hz single phase transformer has the below parameters:
HV : r = 2.4 ‎Ω, X=6 ‎Ω
LV: r = 0.03 ‎Ω, X = 0.07 ‎Ω
The primary resistance referred to secondary is

A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. The core area is(in square cm)

The flux involved in the emf equation of a transformer has

A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. Then the estimated primary turns will be

For a single phase transformer operating at normal operating conditions has useful flux of 1 Wb. If the machine is loaded at 0.8 p.f., then its mutual flux

If the frequency at the primary supply is varied gradually, then the secondary terminal voltage will

CRGO Laminations in a transformer are used to minimize

If a transformer is fed from a dc rather than a 1-phase ac supply, then the transformer will