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heavy > 81mm MCQ > Flashcards

81mm MCQ Flashcards

1
Q

The ——— forms a platform for the mortar and takes the shock of recoil on firing

A

Base plate

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2
Q

It is triangular in shape and on one end it has got a ——- for its ——-

A

Handle, carriage

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3
Q

On the bottom there is an iron frame which is to strengthen it and there are ——— also which prevent it from slipping

A

Three spikes

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4
Q

In the centre of the base plate there is a ——- to lock the breach piece of the barrel

A

Rotating socket

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5
Q

The handle of the rotating socket and ——— of the barrel should be in one line

A

Upper white line

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6
Q

Its weight is ——— and is carried by number 1 of the detachment

A

15.5 kilograms

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7
Q

Barrel is a steel tube with a ——- of 81 millimeter.

A

Bore

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8
Q

The forward end is known as muzzle which is —— thick and is thicker than rest of the barrel

A

1.5 centimeter

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9
Q

At the rear end of the barrel there are ——- cut in on which breach block is locked

A

Threads

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10
Q

From the threads —— towards the muzzle the outer surface of barrel is thicker than the rest of the barrel and this gradually decreases

A

46.5 centimeter

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11
Q

At the forward end of this thicker portion, —— is fixed and this thicker portion prevents the bipod from ———-

A

Bipod, sliding down

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12
Q

Ion the upper surface of the barrel a —— is painted which is used in its general ———

A

White line, alignment

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13
Q

While assembling the barrel, this line, fire control knob ——- cut made in the clamping collar should be in one line

A

3.3 cm

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14
Q

The total length of the barrel is ——- weight is ———

A

1.55 meters, 14.5 kilograms

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15
Q

In the centre and slightly above the breach block ——- is fixed

A

Fire control knob

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16
Q

Firing pin is ——- long and is moved in and out with the help of firing control knob

A

10 centimeter

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17
Q

In the centre of left leg there is an ——— which is connected to connecting rod which moves through the ———-

A

Adjusting nut, connecting rod locking hand wheel

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18
Q

In between the left and right leg there is an ——- with the left leg. There is a ——- to tie both the legs during its carriage

A

Iron chair, leather strap

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19
Q

——— is attached to clamping collar assembly

A

Shock absorber system

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20
Q

The weight of bipod is ———

A

13 kilograms

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21
Q

The sight is issued with an additional part which is known as ——— the sight cannot be fixed with the mortar without the ———-

A

Sight adopter, adopter

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22
Q

This lever locks the adopter with the bracket of ———

A

Bipod

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23
Q

Sight axle fits in this way. It has two cuts in which ——— fits in

A

Sight axle projections

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24
Q

Collimeter sight can be moved up and down and on its right it has got a ——

A

Collimeter lock

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25
Q

Though the adopter can also be fitted in the ——- but it shoulf never be pit in —— as it will damage the sight

A

Sight box, sight box

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26
Q

The deflection on this sight is cut in mills from ——

A

0 to 6400

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27
Q

On major scale every line is at an interval of ———

A

100 mills

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28
Q

Every —— line has figure written on it which shows ———

A

4th line, multiples of 100

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29
Q

On deflection micrometer scale mills are cut from ——- at an interval of ——

A

0 to 100, 1 mill

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30
Q

Every ——— is slightly bigger and every tenth line has got a figure written

A

Fifth line

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31
Q

If given deflection is less than —— then it should only be applied on ———

A

100, micrometer scale

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32
Q

Deflection is increased by moving the micrometer scale in ———

A

Clockwise direction

33
Q

Elevation is also in mils and on elevation major scale it is marked from ———-

A

800 to 1600 mills

34
Q

The line above ——- show as elevation of 700 mills

A

800 mills

35
Q

On elevation micrometer scale elevation is cut from ——- at an interval of 1 mill

A

0 to 100

36
Q

Every —— line is slightly bigger and every tenth line is marked with a figure. Elevation is applied by ———

A

Fifth line, elevation hand knob

37
Q

——— is made of steel with which a strap is attached for carriage

A

Sight case

38
Q

Inside the case there is a wooden frame in which there is a cut for ——- then there are three cuts for placing of ——-

A

Sight axle, three bubbles

39
Q

Then there is a place for sight adjusting and ———

A

Light instruments tube

40
Q

Mortar is the result of the need for a weapon that will reach into ——- and area in defilade from the fire of ———-

A

Field fortifications, flat trajectory weapons

41
Q

Mortar along with its ammunition can easily be carried into action in mortar transport ( ——- and ——) right up to the mortar position if site permit

A

1x 1/4 ton jeep, 3/4 ton trucks

42
Q

The crew should easily be able to carry the mortar over long distances of ——-

A

15 to 20 miles

43
Q

Personnel of the ———- will be required to manhandle the ammunition

A

Rifle companies

44
Q

In hilly terrain or thick jungles, ——- can also be used to transport the weapon and its ammunition

A

Mules

45
Q

One mule load of ——-

A

160 pounds

46
Q

81 millimeter mortar ( complete with accessories-

A

1 mule

47
Q

Pouch ammunition of ——- in boxes of 6 rounds ( one box weighs ——)

A

60 bombs, 80 pounds

48
Q

One mule will carry 2 boxes i.e ——
Due to distinctive ——- and ——- produced while firing 81 mm mortar can easily be detected by the enemy if mortar is not sited behind cover
Moreover an be easily located by —— and —— equipment even if sited behind high cover

A

12 rounds
Sound, flash
Radar, sound ranging

49
Q

The mortar can fire more than ——— but owing to limited ammunition supply it is not practicable to sustain such a high rate of fire

A

30 rounds per minute

50
Q

It is evident from the above that mortars should be used very discriminately in battle and arrangements for its ——— should be made before hand in an operation

A

Ammunition supply

51
Q

The mortar can engage targets within the radius of ——— at widely separated range targets with little delay

A

6400 mills

52
Q

With this weapon seven charges can be used thereby getting the minimum and maximum range which is ——, ——

A

100 meter, 4550 meter

53
Q

It bursts into numerous small jagged fragments approximately—— and travels all round with the the speed of ————

A

1500, 300 feet/ section

54
Q

These fragments may be expected to cause casualty up to a distance of ——— in all directions from the point of bursts

A

100 meters

55
Q

Two types of ammunition cam be fired with this weapon i.e ——- and ——

A

High explosive, smoke

56
Q

With both type of ammunition there is no variation in the range and maximum range i.e ——— meters can be achieved

A

4550

57
Q

Under favourable weather conditions the mortar can produce an effective smoke screen for a limited period if fired smoke bomb ———- which has a fuze ———- filled with white phosphorus

A

M57D, V-19 PA

58
Q

One bomb in favourable weather conditions can make a screen of ———- in length and for ———-

A

40-50 meters, 15-20 seconds

59
Q

The availability of ——- with the mortar sight enable the weapon to engage those targets at night and in reduce visibility which are recorded during day light

A

Light instruments

60
Q

Mortar is the result of the need for a weapon that will reach into ——- and area in defilade from the fire of ———-

A

Field fortifications, flat trajectory weapons

61
Q

Mortar along with its ammunition can easily be carried into action in mortar transport ( ——- and ——) right up to the mortar position if site permit

A

1x 1/4 ton jeep, 3/4 ton trucks

62
Q

The crew should easily be able to carry the mortar over long distances of ——-

A

15 to 20 miles

63
Q

Personnel of the ———- will be required to manhandle the ammunition

A

Rifle companies

64
Q

In hilly terrain or thick jungles, ——- can also be used to transport the weapon and its ammunition

A

Mules

65
Q

One mule load of ——-

A

160 pounds

66
Q

81 millimeter mortar ( complete with accessories-

A

1 mule

67
Q

Pouch ammunition of ——- in boxes of 6 rounds ( one box weighs ——)

A

60 bombs, 80 pounds

68
Q

One mule will carry 2 boxes i.e ——

A

12 rounds

69
Q

The mortar can fire more than ——— but owing to limited ammunition supply it is not practicable to sustain such a high rate of fire

A

30 rounds per minute

70
Q

It is evident from the above that mortars should be used very discriminately in battle and arrangements for its ——— should be made before hand in an operation

A

Ammunition supply

71
Q

The mortar can engage targets within the radius of ——— at widely separated range targets with little delay

A

6400 mills

72
Q

With this weapon seven charges can be used thereby getting the minimum and maximum range which is ——, ——

A

100 meter, 4550 meter

73
Q

It bursts into numerous small jagged fragments approximately—— and travels all round with the the speed of ————

A

1500, 300 feet/ section

74
Q

These fragments may be expected to cause casualty up to a distance of ——— in all directions from the point of bursts

A

100 meters

75
Q

Two types of ammunition cam be fired with this weapon i.e ——- and ——

A

High explosive, smoke

76
Q

With both type of ammunition there is no variation in the range and maximum range i.e ——— meters can be achieved

A

4550

77
Q

Under favourable weather conditions the mortar can produce an effective smoke screen for a limited period if fired smoke bomb ———- which has a fuze ———- filled with white phosphorus

A

M57D, V-19 PA

78
Q

One bomb in favourable weather conditions can make a screen of ———- in length and for ———-

A

40-50 meters, 15-20 seconds

79
Q

The availability of ——- with the mortar sight enable the weapon to engage those targets at night and in reduce visibility which are recorded during day light

A

Light instruments

heavy (5 decks)

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