DGS 5th Form - Transformers Quiz

All of the following are true about transformers except:

• Will not work with DC and AC

• Will not work with DC

• AC will produce change in magnetic field

• AC will induce current

Primary loop is connected to the supply while secondary loop is connected to the load.

• True

• False

Tags

NGSS.HS-PS3-3

Step-up transformer is a transformer that increases the ____________________ .

• Voltage.

• Current.

• Resistance.

• Conductance.

A secondary coil of a transformer has 500 windings. It was supplied with 200 V. How many windings needed at primary coil to produce 100 V.

• 1000

• 250

• 40

• 100

A secondary coil of a transformer is supplied with voltage source, while the primary coil induces voltage (emf).

• True

• False

Tags

NGSS.HS-PS2-5

All of following are characteristics for ideal transformers except:

• Zero leakage flux.

• The wire have no resistance.

• No hysteresis or eddy currents.

• Has similar windings at both primary and secondary coils.

Laminated insulation are normally used in the transformer:

• To reduce the hysteresis effect

• To increase the hysteresis effect

• To reduce the effect of eddy current

• To increase the effect of eddy current

Increasing the number of turns of wire on the secondary of a transformer will:

• decrease the secondary current

• increase the primary current

• increase the secondary current

• have no effect on the secondary current

If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is:

• 200 W

• 75 W

• 50 W

• 100 W

If DC voltage is applied to the primary of a transformer it may:

• Work Efficiently

• Destroy the winding

• Give lower voltage on the secondary side

• Give higher voltage on the secondary side