GATE MN format:mcq PYQs & Answers — Page 27

Questions 261–270 of 348. Imported answers require independent review unless marked reviewed.

Topic practice 348 questionsPage 27 of 35

The vector sum of all the external forces acting on a rigid body is expressed as

and the vector sum of moments of the external forces about a point is given as

. The rigid body is in equilibrium if

Your answerChoose one option.

and

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For a regionalized variable

, at a lag distance

, the empirical semi-variogram

is given by

Your answerChoose one option.

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The coefficient of variation of a dataset is defined as

Your answerChoose one option.

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In project planning, the activity durations are calculated by PERT and CPM techniques assuming

Your answerChoose one option.

PERT: probabilistic, CPM: deterministic

PERT: probabilistic, CPM: probabilistic

PERT: deterministic, CPM: probabilistic

PERT: deterministic, CPM: deterministic

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Respirable dust in an underground coal mine contains 4.5% free silica. As per the CMR 2017, the maximum allowable respirable dust concentration, in mg/m

, in the mine air is

Your answerChoose one option.

1.5

2.0

2.5

3.0

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The purpose of rotating a whirling hygrometer in hygrometric survey is to

Your answerChoose one option.

wet the cotton wick with water thoroughly

maintain constant temperature of water in the container

create steady state evaporation of moisture from the wet bulb surface

prevent the heat produced by the cap lamp of the observer from affecting the readings

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Stone dust barriers in underground coal mines are used to arrest

Your answerChoose one option.

black damp explosions

air blast

firedamp explosions

coal dust explosions

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The correct sequence of attachments between the winding rope and the cage in a drum winding system is

Your answerChoose one option.

Triangular plate → Rope capel → Bull chain → Detaching hook → Cage chain

Rope capel → Bull chain → Triangular plate → Detaching hook → Cage chain

Detaching hook → Rope capel → Bull chain → Cage chain → Triangular plate

Rope capel → Detaching hook → Bull chain → Triangular plate → Cage chain

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The functions of automatic contrivances in a winding system are to prevent

Your answerChoose one option.

over-speeding and over-winding

slow banking and load balancing

over loading and load balancing

over-speeding and load balancing

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A low-grade deep-seated ore body dipping at 70° has a strike length of 2 km, and width of 100 m. The ore body and wall rocks are weak and fractured. The preferred method of mining is

Your answerChoose one option.

shrinkage stoping

cut-and-fill stoping

block caving

room and pillar stoping

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GATE MN format:mcq PYQs

Question 7

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Question 9

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Question 16