Equivalent Circuit of Transformer

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

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, Primary
LV: r = 0.03 ‎Ω, X = 0.07 ‎Ω, Secondary
The secondary reactance referred to primary is

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

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

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

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

CRGO Laminations in a transformer are used to minimize

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

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

The flux involved in the emf equation of a transformer has

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

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