Q.1
What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?
Q.2 The turns ratio required to match an 80 source to a 320 load is
Q.3 When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
Q.4
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?
Q.5
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is
Q.6
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?
Q.7
To step 110 V ac down to 20 V ac, the turns ratio must be
Q.8
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is
Q.9 If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
Q.10
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?
Q.11
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
Q.12
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is
Q.13 A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is
Q.14
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?
Q.15
The primary winding of a power transformer should always be
Q.16 which is symbol of NO switch
