ICE ACCRETION

1.       Hoar frost occurs on airframe in clear air when the temperature of airframe is

a.    below the frost point

b.      frost point

c.      just above the frost point

2.       In clouds at temperatures below 0° C an aircraft may encounter icing of the type

a.      only Glazed

b.      only Rime

c.    intermediate between these two

3.       Opaque Rime ice is

a.    Light porous

b.      Solid

c.      Mixture of porous and solid

4.       Rime is formed by freezing of         supercooled water droplets on airframe when aircraft is flying through clouds

a.    Small

b.      Large

c.      Medium

5.       The     ice poses serious aviation hazard

a.      Rime

b.    Hoar Frost

c.      Glazed

6.       Airframe icing occurs below 0°C.  Its probability of occurrence decreases progressively below -20 °C, as at lower temperatures the proportion of super­cooled water drops in a cloud

a.      Increases

b.      Decreases

c.    Does not change

7.       CI, CS and CC clouds consist mostly ice crystals. Icing hazard is therefore

a.      Maximum

b.    Medium

c.      Negligible

8.       AS, NS  consist of supercooled water drops and ice crystals in varying proportion          icing is possible.

a.      Maximum

b.      Light or moderate

c.    Negligible

9.       In AC clouds ………….. icing is likely in mountainous areas

a.      Severe

b.    Light to moderate

c.      Negligible

10.   In TCU icing may range from light to severe type at.least up to     level.

a.      - 40 °C level

b.      30 °C level

c.    - 20 °C level

11.   In CB icing may range from light to severe type up to -20°C level. Below this temperature severe icing is

a.      not significant

b.      significant

c.      maximum

12.   Liquid water content is an important factor in icing. As the maximum water concentration is around    , maximum ice formation in clouds may also be expected around that level.

a.      -25° C level

b.      -20° C level

c.    -15° C level

13.   Carburetor icing occurs when air from intake passes through a ventury (choke) and causes expansional cooling and vaporization of fuel. Serious icing can occur at extreme temperatures

a.      13 °C

b.    30°C to -10°C

c.      20 °C

14.   occurs in a moist cloudless air on an aircraft surface having temp, below 0° C, due to sublimation of water vapour onto feathery ice crystals.

a.      Rime

b.      Glazed

c.    Hoar Frost

15.   occurs in St, Sc, Ac, Cu, Ns at temperature -10 to -40° C and in Cb at temperature -20 to -40°C

a.    Rime

b.      Glazed

c.      Hoar Frost

16.   In clouds ………… occurs when a wide range of water drop sizes are present at temperatures between 0° C and -40° C

a.      Rime

b.      Glazed

c.    Mixture of rime and clear ice

17.   occurs in AS, NS, SC and towering CU or CB between 0° C and -20° C, in warm front below 0° C, especially if the aircraft has rapidly descended from a colder region

a.    Glazed

b.      Fume

c.      Mixture of Rime and Clear ice

18.   When fog freezes on parked aircraft it produces..,

a.    Hoar Frost

b.      Hoar Frost

c.      Clear ice

19.   Icing          the stalling speed appreciably

a.      Decreases

b.    Increases

c.      Does not increase/decrease