Sunday 3 November 2024

GANTRY GIRDERS GATE 2025 IMPORTANT MCQ

 1.  the drag load in gantry girders are:

a. gravity loads

b. lateral loads 

c. longitudinal loads 

d. both  a and c options are true 

2.  surge load in gantry girder are :

a. gravity loads

b. lateral loads 

c. longitudinal loads 

d. both  a and b  options are true 

3.  when gantry girder carry  moving load such as charging cars , the deflection should not exceed 

a. L/500

b. L/600

c. L/750

d.  L/1000

4. when gantry girder carry manually operated overheated travelling cranes , the deflection should not exceed 

a. L/500

b. L/600

c. L/750

d.  L/1000

5.  gantry girders are usually designed as 

a. laterally supported beam

b. laterally unsupported beam 

c. for combination of vertical loads and either of lateral and longitudinal forces 

d. both option b and c are true 





Monday 28 October 2024

gate 2025 concrete technology important questions MCQ

 

1. Which one of these is not a workability test for concrete?

a.  Flow table test

b. Vee bee consistometer test

c. Slump test

d. Shear box test

Accepted Answers:

Shear box test

2. Bulking of sand is the

a)     Rolling of heavy weight roller on sand

b)     Increase in volume of sand due to moisture

c)     Segregating of water from wet sand

d)     Decrease in volume of sand

Accepted Answers:

Increase in volume of sand due to moisture

3   Loss in weight in the test for loss on ignition of OPC should be less than

a)     4%

b)     5%

c)     6%

d)     0%

Accepted Answers:

4%

4  In cement manufacturing, gypsum is used as a:

a)     Set regulator

b)     Water reducer

c)     Heat controller

d)     None

Accepted Answers:

Set regulator

5 The decreasing order of the rate of hydration for Bogue’s compounds of cement is

a)     C2S, CSH and C3A

b)     C2S, C3S and C3A

c)     C3A, C3S and C2S

d)     C3A, C3S and CH

Accepted Answers:

C3A, C3S and C2S

6. Which of the following statement for a concrete specimen is true

a)     Cube strength = cylinder strength

b)      Cube strength = 0.85 times cylinder strength

c)      Cylinder strength = 0.85 times cube strength

d)     Cylinder strength = 1.2 times cube strength

Accepted Answers:

Cylinder strength = 0.85 times cube strength

7 Deformation due to sustained loading is termed as:

a)     Shrinkage

b)      Efflorescence

c)      Fatigue

d)      Creep

Accepted Answers:

Creep

8  Which of the following is not a mineral admixture for concrete?

a)     Fly ash

b)      Copper slag

c)      Blast furnace slag

d)     Silica fume

Accepted Answers:

Copper slag

9  When a rebar corrodes within a concrete, its volume

a)     Increases

b)      Decreases

c)      Remains the same

d)      Decreases initially and then increases

Accepted Answers:

Increases

10 U- box is a test for measuring the ________ of self-compacting concrete

a)     Workability

b)     Passing ability

c)      Segregation potential

d)      Flexural strength

Accepted Answers:

Passing ability

 

11 αC2S is present in

a)     Modern clinker

b)      Aspdin’s clinker

c)      Both clinkers

d)     Not present in any clinker

e)      

Accepted Answers:

Modern clinker

 

12  Excess free lime in OPC causes

a)     Increase in compressive strength

b)      Prolonged final setting time

c)      Unsoundness of cement

d)      Lower heat of hydration

Accepted Answers:

Unsoundness of cement

 

13 In modern clinker the alite size is reduced and belite size has increased because

a)     To increase the reactivity of alite and uniform and complete burning in rotary kiln leads to larger crystal sizes of belite

b)     To increase the reactivity of belite and uniform and complete burning in rotary kiln leads to smaller crystal sizes of alite

c)     The modern clinker production process needs slower burning rate and so alite size is reduced and belite size increased

d)      Both a and c

Accepted Answers:

To increase the reactivity of alite and uniform and complete burning in rotary kiln leads to larger crystal sizes of belite

14   As per IS 269, a maximum of 5% of performance enhancer can be added, it is called performance enhancer because

a)     It increases the strength of the concrete

b)     It increases efficiency (net energy emission and cost) of cement production mill

c)     It decreases the pollution caused by cement mill

d)      All of the above

Accepted Answers:

It increases efficiency (net energy emission and cost) of cement production mill

15  The two primary ternary systems existing for cement are

a)      CaO-SiO2-Al2O3

b)      SiO2-Al2O3-Fe2O3

c)      CaO-Al2O3-Fe2O3

d)     CaO-SiO2- Fe2O3

Accepted Answers:

CaO-SiO2-Al2O3

CaO-Al2O3-Fe2O3

 

16  The assumption(s) in Bogue equation is(are)

a)     No secondary mineral present

b)     A/F>0.64

c)      All aluminoferrites are not in the form of C4AF

d)      Accounts for free lime

e)      System is in equilibrium

Accepted Answers:

No secondary mineral present

A/F>0.64

System is in equilibrium

 

17  The rotary kiln is generally made of steel, which fails at high temperature. The interior is insulated using __________ (i) and _______________(ii).

 (i) Firebrick; (ii) Calcium Silicate

 (i) Firebrick; (ii) Ceramic Fiber

 (i) Ceramic Fiber; (ii) Calcium Silicate

 (i) Firebrick; (ii) Refractory Brick

 (i) Refractory Brick; (ii) Insulating Wool

Accepted Answers:

(i) Firebrick; (ii) Refractory Brick

18  The cyclonic separators introduced in cement production before feeding raw materials into the kiln are known as:

 Electrostatic Precipitators

 Bag Filters

 Grate Coolers

 Preheaters

 Scrubbers

Accepted Answers:

Preheaters

19  Which of the following are names given to the zones in the rotary kiln in cement production?

 Hydration zone

 Dehydration zone

 Clinkering zone

 Calcining zone

 Cooling zone

Accepted Answers:

Dehydration zone

Clinkering zone

Calcining zone

Cooling zone


 

 

 

 

 

Thursday 17 October 2024

Durability of Concrete important Question GATE 2025

                                Durability of Concrete important Question GATE  2025



1    Primary Ettringites are formed during hydration of cement. But sample A and B shows crack initiation after few months. The sample A is collected from a railway sleeper whereas sample B is collected from surface of a sewage pipe. What can you say about A and B?
 
 
 
 
accepted Answers:

Friday 4 October 2024

creep and shrinkage GATE 2025 MCQ IMPORTANT

 

DEAR  STUDENTS 

THIS BLOG HELPFUL TO GATE 2025 ASPIRANTS FOR CREEP AND SHRINKAGE TOPIC 

THANK YOU 

The hooked fibers perform better than straight fibers of same length and shape because - 

 
 
 
 
1 point
2 Which of these are true –
 
 
 
 
 

3   Creep and shrinkage are time-dependent tests. These include the movement of water. In creep strain the water is a)______________ by stress and the water gets b)___________ during shrinkage.
1 point
a)______________
 
 
1 point
b)___________
 
 

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