Applied Technology

Question 1

1In AM radio, the information is carried by changes in the carrier wave's

Easy

A. speed B. frequency C. colour D. amplitude

Question 2

2An electric kettle that does not heat although power reaches it most likely has

Easy

A. a clean filter B. a broken (open-circuit) heating element C. a new plug D. too much water

Question 3

3Losses in a transformer caused by the resistance of its windings are

Medium

A. copper losses B. iron losses C. eddy current losses D. hysteresis losses

Question 4

4An electric iron converts electrical energy mainly into

Easy

A. light B. sound C. heat D. motion

Question 5

5A thermostat in an electric iron

Easy

A. switches the heating element on and off to control temperature B. produces light C. measures voltage D. stores water

Question 6

6In a DC motor, the commutator

Medium

A. measures speed B. stores charge C. cools the motor D. reverses the current in the coil every half turn

Question 7

7The part of an electric fan that rotates is the

Easy

A. casing B. stator C. rotor D. switch

Question 8

8An electric kettle element converts electrical energy to

Easy

A. motion B. heat C. sound D. light

Question 9

9A refrigerator keeps food cold by

Easy

A. adding ice B. pumping heat out using a refrigerant C. blowing fans only D. using solar heat

Question 10

10A ceiling fan contains an

Easy

A. battery B. heating element C. transformer only D. electric motor