81mm MCQ Flashcards
The ——— forms a platform for the mortar and takes the shock of recoil on firing
Base plate
It is triangular in shape and on one end it has got a ——- for its ——-
Handle, carriage
On the bottom there is an iron frame which is to strengthen it and there are ——— also which prevent it from slipping
Three spikes
In the centre of the base plate there is a ——- to lock the breach piece of the barrel
Rotating socket
The handle of the rotating socket and ——— of the barrel should be in one line
Upper white line
Its weight is ——— and is carried by number 1 of the detachment
15.5 kilograms
Barrel is a steel tube with a ——- of 81 millimeter.
Bore
The forward end is known as muzzle which is —— thick and is thicker than rest of the barrel
1.5 centimeter
At the rear end of the barrel there are ——- cut in on which breach block is locked
Threads
From the threads —— towards the muzzle the outer surface of barrel is thicker than the rest of the barrel and this gradually decreases
46.5 centimeter
At the forward end of this thicker portion, —— is fixed and this thicker portion prevents the bipod from ———-
Bipod, sliding down
Ion the upper surface of the barrel a —— is painted which is used in its general ———
White line, alignment
While assembling the barrel, this line, fire control knob ——- cut made in the clamping collar should be in one line
3.3 cm
The total length of the barrel is ——- weight is ———
1.55 meters, 14.5 kilograms
In the centre and slightly above the breach block ——- is fixed
Fire control knob
Firing pin is ——- long and is moved in and out with the help of firing control knob
10 centimeter
In the centre of left leg there is an ——— which is connected to connecting rod which moves through the ———-
Adjusting nut, connecting rod locking hand wheel
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
Iron chair, leather strap
——— is attached to clamping collar assembly
Shock absorber system
The weight of bipod is ———
13 kilograms
The sight is issued with an additional part which is known as ——— the sight cannot be fixed with the mortar without the ———-
Sight adopter, adopter
This lever locks the adopter with the bracket of ———
Bipod
Sight axle fits in this way. It has two cuts in which ——— fits in
Sight axle projections
Collimeter sight can be moved up and down and on its right it has got a ——
Collimeter lock
Though the adopter can also be fitted in the ——- but it shoulf never be pit in —— as it will damage the sight
Sight box, sight box
The deflection on this sight is cut in mills from ——
0 to 6400
On major scale every line is at an interval of ———
100 mills
Every —— line has figure written on it which shows ———
4th line, multiples of 100
On deflection micrometer scale mills are cut from ——- at an interval of ——
0 to 100, 1 mill
Every ——— is slightly bigger and every tenth line has got a figure written
Fifth line
If given deflection is less than —— then it should only be applied on ———
100, micrometer scale
Deflection is increased by moving the micrometer scale in ———
Clockwise direction
Elevation is also in mils and on elevation major scale it is marked from ———-
800 to 1600 mills
The line above ——- show as elevation of 700 mills
800 mills
On elevation micrometer scale elevation is cut from ——- at an interval of 1 mill
0 to 100
Every —— line is slightly bigger and every tenth line is marked with a figure. Elevation is applied by ———
Fifth line, elevation hand knob
——— is made of steel with which a strap is attached for carriage
Sight case
Inside the case there is a wooden frame in which there is a cut for ——- then there are three cuts for placing of ——-
Sight axle, three bubbles
Then there is a place for sight adjusting and ———
Light instruments tube
Mortar is the result of the need for a weapon that will reach into ——- and area in defilade from the fire of ———-
Field fortifications, flat trajectory weapons
Mortar along with its ammunition can easily be carried into action in mortar transport ( ——- and ——) right up to the mortar position if site permit
1x 1/4 ton jeep, 3/4 ton trucks
The crew should easily be able to carry the mortar over long distances of ——-
15 to 20 miles
Personnel of the ———- will be required to manhandle the ammunition
Rifle companies
In hilly terrain or thick jungles, ——- can also be used to transport the weapon and its ammunition
Mules
One mule load of ——-
160 pounds
81 millimeter mortar ( complete with accessories-
1 mule
Pouch ammunition of ——- in boxes of 6 rounds ( one box weighs ——)
60 bombs, 80 pounds
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
12 rounds
Sound, flash
Radar, sound ranging
The mortar can fire more than ——— but owing to limited ammunition supply it is not practicable to sustain such a high rate of fire
30 rounds per minute
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
Ammunition supply
The mortar can engage targets within the radius of ——— at widely separated range targets with little delay
6400 mills
With this weapon seven charges can be used thereby getting the minimum and maximum range which is ——, ——
100 meter, 4550 meter
It bursts into numerous small jagged fragments approximately—— and travels all round with the the speed of ————
1500, 300 feet/ section
These fragments may be expected to cause casualty up to a distance of ——— in all directions from the point of bursts
100 meters
Two types of ammunition cam be fired with this weapon i.e ——- and ——
High explosive, smoke
With both type of ammunition there is no variation in the range and maximum range i.e ——— meters can be achieved
4550
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
M57D, V-19 PA
One bomb in favourable weather conditions can make a screen of ———- in length and for ———-
40-50 meters, 15-20 seconds
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
Light instruments
Mortar is the result of the need for a weapon that will reach into ——- and area in defilade from the fire of ———-
Field fortifications, flat trajectory weapons
Mortar along with its ammunition can easily be carried into action in mortar transport ( ——- and ——) right up to the mortar position if site permit
1x 1/4 ton jeep, 3/4 ton trucks
The crew should easily be able to carry the mortar over long distances of ——-
15 to 20 miles
Personnel of the ———- will be required to manhandle the ammunition
Rifle companies
In hilly terrain or thick jungles, ——- can also be used to transport the weapon and its ammunition
Mules
One mule load of ——-
160 pounds
81 millimeter mortar ( complete with accessories-
1 mule
Pouch ammunition of ——- in boxes of 6 rounds ( one box weighs ——)
60 bombs, 80 pounds
One mule will carry 2 boxes i.e ——
12 rounds
The mortar can fire more than ——— but owing to limited ammunition supply it is not practicable to sustain such a high rate of fire
30 rounds per minute
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
Ammunition supply
The mortar can engage targets within the radius of ——— at widely separated range targets with little delay
6400 mills
With this weapon seven charges can be used thereby getting the minimum and maximum range which is ——, ——
100 meter, 4550 meter
It bursts into numerous small jagged fragments approximately—— and travels all round with the the speed of ————
1500, 300 feet/ section
These fragments may be expected to cause casualty up to a distance of ——— in all directions from the point of bursts
100 meters
Two types of ammunition cam be fired with this weapon i.e ——- and ——
High explosive, smoke
With both type of ammunition there is no variation in the range and maximum range i.e ——— meters can be achieved
4550
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
M57D, V-19 PA
One bomb in favourable weather conditions can make a screen of ———- in length and for ———-
40-50 meters, 15-20 seconds
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
Light instruments
