Quiz about Ac/Dc and Transformers

Question 1

AC stands for __________ current.

Accepted Answer

alternating

Answer

Adjusting

Answer

Alarmed

Answer

Additional

Question 2

DC stands for __________ current.

Accepted Answer

direct

Answer

deviating

Answer

default

Answer

diverging

Question 3

This picture is an example of a ___________

Accepted Answer

Step- Down Transformer

Answer

Step- Up Transformer

Answer

Motor

Answer

Generator

Question 4

An oscilloscope shows the current flow above what type of current is it showing?

Accepted Answer

AC

Answer

DC

Answer

Rectified Current

Answer

Non rectified current

Question 5

Question 5.

Accepted Answer

DC

Answer

AC

Answer

rectified current

Answer

non rectified current

Question 6

A transform has 2400 turns on a primary coil and 120 turns on a secondary coil, the input voltage is 240 volts what is the output voltage?

Secondary voltage / Primary voltage = No. of turns in Secondary coil / No. of turns in Primary coil.

Accepted Answer

12v

Answer

6v

Answer

9v

Answer

24v

Question 7

The above half wave form is created by an AC going into which circuit?

Accepted Answer

single diode

Answer

Bridge rectifier

Answer

Transformer

Answer

Voltage regulator

Question 8

Select the correct voltage graphs for a cell.

Accepted Answer

Option A is correct

Accepted Answer

Option B is correct

Answer

C.

Answer

D.

Question 9

Mains current has a frequency of 50 Hz. This means it changes direction 50 times every __________.

Accepted Answer

second

Answer

Minute

Answer

Time

Answer

Hertz

Question 10

Flows in only one diretion

Accepted Answer

Direct Current

Answer

Alternating Current

Question 11

Which type of transformer decreases the amount of voltage?

Accepted Answer

step-down transformer

Answer

step fix transformer

Answer

step-up transformer

Answer

step decrease transformer

Question 12

The function of a transformer is to ...

Accepted Answer

increase or decrease A.C voltage or A.C current levels

Answer

raise and lower the apparent power levels

Answer

transfer DC voltage from the primary winding to the secondary winding

Answer

transform mechanical energy into electrical energy

Question 13

Primary winding of a transformer is determined by ...

Accepted Answer

which winding is connected to the source

Answer

which winding is nearer to the load

Answer

which winding has more turns

Answer

which side has the highest voltage

Question 14

Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary?

Accepted Answer

30 V

Answer

0.333 V

Answer

2 V

Answer

120V

Question 15

Will a transformer work with direct current (d.c.) or alternating current (a.c.)?

Accepted Answer

a.c. only

Answer

d.c. only

Answer

Both a.c. and d.c.

Ac/Dc and Transformers

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