Vayudoot Aviation

1. Roaring Forties are ............... winds blow throughout the year and are of very stormy nature in

Wly, S hemisphere

Wly, N hemisphere

Ely, S hemisphere

2. The two main seasons in India are

Pre monsoon and SW monsoon

Winter and SW monsoon

Winters and Hot season

Hot season and Rainy season

3. The observed temperature is - 40 deg C at FL 300 (10 km). it is termed as

15 deg C warmer than ISA

15 deg C colder than ISA

10 deg C colder than ISA

10 deg C warmer than ISA

4. The calm and clear night is cooler than cloudy night because

Due to CO2 and H2O present in the air

Clouds radiate heat towards sky

Terrestrial radiation skip through clouds

Clouds prevent terrestrial radiations from escaping

5. The temperature to which air should be cooled to saturate it is ......... temperature

Dry bulb

Ambient

Wet bulb

Dew point

6. If temperature initially is constant and then increases with height, the atmosphere is

Unstable

Stable

Indifferent

Adiabatic

7. Difference between Airmass TS (AM TS) and steady state TS (SS TS) is

AM TS duration is more

SS TS duration is more

SS TS duration is less

AM TS occur in fronts

8. CAT is most likely to be encountered in

A high close to a dust storm

After the passage of a severe sandstorm

A sharp trough aloft with winds of jet stream speed

A ridge aloft

9. No cyclonic storm or high pressure system form within 5° of the equator because

Pressure gradient force is negligible

Coriolis force is negligible

Frictional force is minimal

Geotropic force is maximum

10. Example of non frontal stability is

Inversion

Occlusion

Frontogenesis

Squall line

11. Wind shear in a TS is maximum

Below the anvil

All sides of a CB

Beneath the cloud

In SW sector

12. Aquaplaning may occur in

+RA

-TS

-GR

Thick Fog

13. In a line of TS there is a hole in the Radar echo, what would you infer

No precipitation

Area free of clouds

Strong convective activity

A gap between two CB

14. Flying conditions associated with CB during pre monsoon are

Rain, poor visibility, and turbulence

Good visibility, drizzle, turbulence

Hail, gusts, shower, and severe turbulence

Continuous rain, poor visibility, light turbulence

15. The axis of monsoon trough runs

Along the Gangetic plains

Along 22 deg East to West of India

In the Bay of Bengal

Along central peninsula

16. Diurnal variation of temperature is least

When sky is overcast

During land breeze over the coastal areas

When winds are weak over the land surface

When sky is clear

17. A/C moving from west to east and its drifting northwards. Its altimeter will

Under read

Reading will remain unchanged

Over read

18. CAVOK in a METAR replaces

Visibility, temp & cloud groups

Wind, temp & pressure groups

Wind, visibility & cloud groups

Visibility, cloud and Wx groups

19. ESNO is the name given to

Southern oscillations and La - Nino

El - Nino and La - Nino combined

El - Nino and Southern oscillations

El - Nino only

20. The term 'monsoon' means

Rains all over India

One of the four seasons with maximum rain in the N

Monsoon circulation

Seasonal reversal of winds and rainfall

21. The main cause of seasons in India is

Earth rotating around its own axis

Advection of air from Arabian sea

Thermal equator at equator whole year

Oscillation of sun 23 1/2 N to 23 1/2 S

22. Which is not true of post monsoon

Frequency of tropical cyclones is max

Pressure gradient is weakest of all seasons

Monsoon withdraws from the country

Worst period for flying expect S India

23. The wind 260102 KT, is reported in a METAR / SPECI as

260102 KT + 26002 KT

Only in remark column

260P99 KT and complete wind in remark column

260P99 KT only

24. Friction causes winds to get deflected ...........

Perpendicular to isobars

Parallel to isobars

Towards low

Towards high

25. Temperature in the troposphere decreases from equator to poles. The thermal wind throughout troposphere is therefore ......... and ........ as height increases

Wly, decreases

Ely, increases

Wly, remains same

Wly, increases

26. Which is true of a cold front

Less steeper than a warm front

Similar slope as warm front

Heavy convective weather and squall line

Associated with continuous rain and ST clouds

27. Gradient wind is weaker than geostrophic wind around a low because

Coriolis force is opposite to centripetal

Coriolis force is added to the pressure gradient force

Centripetal force is added to the pressure gradient force

Centripetal force is provided by pressure gradient force

28. Advection fog occurs due to ........ air moving over ............ surface over .............

Dry, wet, land only

Warm & moist air, cold, both land & sea

Moist and cold, warm, land only

29. TAF generally has a validity of .......... hr and TREND ........... hr

12 hr; 2 hr

24 hr; 3 hr

9 hr; 2 hr

24 hr; 9 hr

30. The altimeter of an aircraft is set to QFE before landing, on landing it will indicate

A/C altitude AMSL

Flight level

Height of A/C wheels above runway

Height of A/C above ARP in ISA

31. Ice accretion

Increases drag but reduces stalling speed

Alters aerodynamics, reduces weight, and decrease lift

Increases drag and weight and stalling speed

Alters aerodynamics, increases weight and lift

32. During SW monsoon the winds above 500 hPa are

Strong Ely over S weak over N India

Wly over S and weak Wly over N India

Wly over S and strong over N India

Ely over S weak Wly over N India

33. Due to friction the wind

Decreases and veers during landing

Strengthens and backs during landing

Decreases and backs during landing

Strengthens and backs during take off

34. Translucent rime ice forms due to

Sublimation of large hail

Melting of large snow particles

Freezing of small supercooled water drops

freezing of large supercooled water drops

35. Will SPECI be issued if

Wind change from 27010 KT to 29018 KT

Visibility change from 6000 m to 4000 m

Temperature change from 15 to 16 deg C

RVR change, from 1400 m to 1600 m

36. No questions in the pdf

Most potent area for dangerous icing is freezing level to about 25,000 ft

Severe icing may form in the temperature range - 10 to 30 deg C

icing may be severe in the temperature range - 20 to - 40 deg C

The level from ground to freezing level is more susceptible for icing

37. ITCZ affects weather over India during

Pre - monsoon only

Monsoon only

All the four seasons

Winters only

38. During monsoon season the low level winds are

SEly along E coast

SEly over Bay of Bengal

NEly over Tamil Nadu

SEly North of monsoon trough

39. Effect of wind shear

Weakening head wind raises aircraft above the flight path

Decreasing head wind increases lift

Increasing tail wind increases lift

Decreasing tail wind increases lift and a/c rises above the glide path

40. The months during which Tamil Nadu gets most of its rainfall are

Oct - Nov

Apr - Jun

Dec - Mar

Jul - Sep

41. Gradient wind

Is super geostrophic in a low and subgeostrophic in a high

Blows parallel to straight isobars

Is due to the balance between pressure gradient, Coriolis and Centripetal forces

Is due to the balance between pressure gradient force and friction

42. Station level pressure at ARP is reduced to MSL as per

ISA is QFF

Isothermal is QNH

ISA is QNH

ISA is QFE

43. ELR 6.5° C and SALR 7° C on lifting a saturated parcel of air the atmosphere would be

Stable

Absolutely unstable

Absolutely stable

Indifferent

44. Density altitude is

Higher if atmosphere is isothermal

Higher if atmosphere is colder than ISA

Higher if atmosphere is warmer than ISA

Lower if atmosphere is warmer than ISA

45. Under what conditions severe icing is encountered

Rain at temperature - 20 deg C

Visible vapour and temperature - 5 deg C

Rain and temperature below - 10 deg C

Temperature 0 deg C

46. CAT is most pronounced on which side of a subtropical jet stream

South side of core

About 3 km above the core

at core

Cold side of core

47. Hail forms by collision with super - cooled water drops by

Deposition

Condensation

Transpiration

Evaporation

48. A cold front passes a station, the pressure

First increases and then decreases

Change are very small

First decreases and then increases

Rises continually

49. Thermal wind blows parallel to ............ keeping ............ to the left

Isobars, low temperature

Isallobars, high temperature

Isotherms, low temperature

Isobars, low pressure

50. What are Norwesters

Severe Dust storm from NW

TS of E and NE India in premonsoon

Warm dry winds coming from NW

TS affecting NW India in premonsoon

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