NHA Sub Engineer Solved MCQs.
The shape of the camber, best suited for cement concrete pavements, is_______________?
A. straight line
B. elliptical
C. parabolic
D. combination of straight and parabolic
The stopping sight distance depends upon_______________?
A. speed of vehicle
B. total reaction time of driver
C. efficiency of brakes
D. all of the above
Coefficient of friction is less when the pavement surface is________________?
A. dry
B. rough
C. smooth and dry
D. smooth and wet
Camber in the road is provided for_______________?
A. effective drainage
B. having proper sight distance
C. counteracting the centrifugal force
D. none of the above
On a single lane road with two way traffic, the minimum stopping sight distance is equal to______________?
A. half the stopping distance
B. two times the stopping distance
C. stopping distance
D. three times the stopping distance
The shoulder provided along the road edge should be_______________?
A. rougher than the traffic lanes
B. of very low load bearing capacity
C. of same colour as that of the pavement
D. smoother than the traffic lanes
When the path travelled along the road surface is more than the circumferential movement of the wheels due to rotation, then it results in______________?
A. turning
B. skidding
C. slipping
D. revolving
For water bound macadam roads in localities of heavy rainfall, the recommended value of camber is_______________?
A. 1 in 48
B. 1 in 36
C. 1 in 30
D. 1 in 60
The sequence of four stages of survey in a highway alignment is______________?
A. map study, preliminary survey, reconnaissance and detailed survey
B. reconnaissance, map study, preliminary survey and detailed survey
C. map study, reconnaissance, preliminary survey and detailed survey
D. preliminary survey, map study, reconnaissance and detailed survey
Nagpur road plan formula were prepared by assuming______________?
A. radial or star and block road pattern
B. rectangular or block road pattern
C. radial or star and circular road pattern
D. radial or star and grid road pattern
Compared to a level surface, on a descending gradient the stopping sight distance is_______________?
A. same
B. more
C. less
D. dependent on the speed
The desirable length of overtaking zone as per IRC recommendation is equal to________________?
A. two times the overtaking sight distance
B. overtaking sight distance
C. three times the overtaking sight distance
D. five times the overtaking sight distance
Select the correct statement______________?
A. Second 20-year plan allowed deduction of length of railway track in the area while calculating the length of roads
B. Nagpur road plan has a target road length of 32 km per 100 square km
C. Second 20-year plan has provided 1600 km of expressways out of the proposed National highway
D. Nagpur road plan formula take into account the towns with very large population
Reaction time of a driver_______________?
A. is same for all speeds
B. decreases with increase in speed
C. increases with increase in speed
D. none of the above
If the stopping distance is 60 meters, then the minimum stopping sight distance for two lane, two way traffic is_________________?
A. 120m
B. 60m
C. 30m
D. 180m
If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be________________?
A. greater than b/2h and less than co-efficient of lateral friction
B. less than b/2h and also less than co-efficient of lateral friction
C. less than b/2h and greater than co-efficient of lateral friction
D. greater than b/2h and also greater than coefficient of lateral friction
The ruling design speed on a National Highway in plain terrain as per IRC recommendations is_____________?
A. 80 kmph
B. 60 kmph
C. 100 kmph
D. 120 kmph
The effect of grade on safe overtaking sight distance is_______________?
A. to decrease it on descending grades and to increase it on ascending grades
B. to increase it on descending grades and to decrease it on ascending grades
C. to increase it on both descending and ascending grades
D. to decrease it on both descending and ascending grades
Stopping sight distance is always_______________?
A. less than overtaking sight distance
B. more than overtaking sight distance
C. equal to overtaking sight distance
D. none of the above
The terrain may be classified as rolling terrain if the cross slope of land is______________?
A. between 25% and 60%
B. between 10% and 25%
C. upto 10%
D. more than 60%
For the design of super elevation for mixed traffic conditions, the speed is reduced by_____________?
A. 20%
B. 15%
C. 25%
D. 75%
For a constant value of coefficient of lateral friction, the value of required super-elevation increases with_______________?
A. decrease in both speed and radius of curve
B. increase in both speed and radius of curve
C. increase in speed and with decrease in radius of curve
D. decrease in speed and with increase in radius of curve
As per IRC recommendations, the maximum limit of super elevation for mixed traffic in plain terrain is_______________?
A. 1 in 15
B. 1 in 10
C. 1 in 12.5
D. equal to camber
On a horizontal curve if the pavement is kept horizontal across the alignment, then the pressure on the outer wheels will be_________________?
A. more than the pressure on inner wheels
B. equal to the pressure on inner wheels
C. less than the pressure on inner wheels
The attainment of super elevation by rotation of pavement about the inner edge of the pavement_______________?
A. results in balancing the earthwork
B. is preferable in steep terrain
C. avoids the drainage problem in flat terrain
D. does not change the vertical alignment of road
To calculate the minimum value of ruling radius of horizontal curves in plains, the design speed is given by_________________?
A. 12 kmph
B. 8 kmph
C. 16 kmph
D. 20 kmph
In case of hill roads, the extra widening is generally provided______________?
A. fully on the outer side of the curve
B. fully on the inner side of the curve
C. equally on inner and outer sides of the curve
D. one-fourth on inner side and three-fourth on outer side of the curve
The maximum design gradient for vertical profile of a road is______________?
A. ruling gradient
B. exceptional gradient
C. limiting gradient
D. minimum gradient
The transition curve used in the horizontal alignment of highways as per IRC recommendations is_______________?
A. spiral
B. cubic parabola
C. lemniscate
D. any of the above
The absolute minimum radius of curve for safe operation for a speed of 110 kmph is______________?
A. 220 m
B. 110 m
C. 440 m
D. 577 m
Select the correct statement_________________?
A. Psychological extra widening depends on the number of traffic lanes.
B. Psychological extra widening depends on the length of wheel base.
C. Mechanical extra widening depends on the speed of vehicle.
D. Psychological extra widening depends on the speed of vehicle
For design, that length of transition curve should be taken which is_____________?
A. based on rate of change of super elevation
B. based on allowable rate of change of centrifugal acceleration
C. higher of (A) and (B)
D. smaller of (A) and (B)
If ruling gradient is I in 20 and there is also a horizontal curve of radius 76 m, then the compensated grade should be_________________?
A. 5%
B. 4%
C. 3%
D. 6%
Which of the following shapes is preferred in a valley curve ?
A. spiral
B. cubic parabola
C. simple parabola
D. lemniscate
The percentage compensation in gradient for ruling gradient of 4% and horizontal curve of radius 760 m is____________________?
A. 1%
B. 0.1%
C. 10%
D. no compensation
The camber of road should be approximately equal to___________________?
A. two times the longitudinal gradient
B. longitudinal gradient
C. three times the longitudinal gradient
D. half the longitudinal gradient
In case of summit curves, the deviation angle will be maximum when_______________?
A. an ascending gradient meets with a level surface
B. an ascending gradient meets with a descending gradient
C. a descending gradient meets with another descending gradient
D. an ascending gradient meets with another ascending gradient
Enoscope is used to find______________?
A. space-mean speed
B. spot speed
C. average speed
D. time-mean speed
If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the length of summit curve for a stopping sight distance of 80 m will be_______________?
A. 64m
B. zero
C. 80m
D. 60m
The value of ruling gradient in plains as per IRC recommendation is______________?
A. 1 m 15
B. 1 in 12
C. 1 in 20
D. 1 in 30
If the design speed is V kmph and deviation angle is N radians, then the total length of a valley curve in meters is given by the expression_________________?
A. 3.8 NV”2
B. 0.38 (NV3)”2
C. 0.38 N V3/2
D. 3.8 (NV3)”2
Highway facilities are designed for_________________?
A. annual average daily traffic
B. annual average hourly volume
C. thirtieth highest hourly volume
D. peak hourly volume of the year
For highway geometric design purposes the speed used is________________?
A. 50 “”percentile
B. 15th percentile
C. 85th percentile
D. 98 “”percentile
The maximum width of a vehicle as recommended by IRC is________________?
A. 3.81 m
B. 2.44 m
C. 1.85 m
D. 4.72 m
Select the correct statement__________________?
A. 85th percentile speed is more than 98th percentile speed
B. Traffic capacity should always be more than traffic volume
C. Spot speed is the average speed of a vehicle at a specified section
D. Traffic volume should always be more than traffic capacity
Which of the following methods is preferred for collecting origin and destination data for a small area like a mass business center or a large intersection ?
A. return postcard method
B. license plate method
C. road side interview method
D. home interview method
Length of a vehicle affects________________?
A. width of shoulders and parking facilities
B. extra width of pavement and minimum turning radius
C. width of traffic lanes
D. clearance to be provided under structures such as overbridges, under-bridges etc
Desire lines are plotted in_________________?
A. speed studies
B. traffic volume studies
C. accident studies
D. origin and destination studies
The diagram which shows the approximate path of vehicles and pedestrians involved in accidents is known as___________________?
A. pie charts
B. spot maps
C. condition diagram
D. collision diagram
Which of the following is known as design capacity ?
A. basic capacity
B. possible capacity
C. theoretical capacity
D. practical capacity
Equivalent factor of passenger car unit (PCU) for a passenger car as per IRC is_____________?
A. 1.0
B. 0.5
C. 2.0
D. 10
With increase in speed of the traffic stream, the minimum spacing of vehicles________________?
A. increases
B. first decreases and then increases after reaching a minimum value at optimum speed
C. decreases
D. first increases and then decreases after reaching a maximum value at optimum speed
With increase in speed of the traffic stream, the maximum capacity of the lane________________?
A. decreases
B. increases
C. first increases and then decreases after reaching a maximum value at optimum speed
D. first decreases and then increases after reaching a minimum value at optimum speed
If the stopping distance and average length of a vehicle are 18 m and 6 m respectively, then the theoretical maxi¬mum capacity of a traffic lane at a speed of 10 m/sec is________________?
A. 1500 vehicles per hour
B. 2500 vehicles per hour
C. 2000 vehicles per hour
D. 3000 vehicles per hour
The diagram which shows all important physical conditions of an accident location like roadway limits, bridges, trees and all details of roadway conditions is known as_____________?
A. spot maps
B. pie chart
C. condition diagram
D. collision diagram
The background colour of the informatory sign board is______________?
A. green
B. yellow
C. red
D. white
When the speed of traffic flow becomes zero,then_______________?
A. traffic density attains maximum value whereas traffic volume becomes zero
B. traffic density and traffic volume both become zero
C. traffic density and traffic volume both attain maximum value
D. traffic density becomes zero whereas traffic volume attains maximum value
Scientific planning of transportation system and mass transit facilities in cities should be based on_____________?
A. traffic volume data
B. origin and destination data
C. spot speed data
D. accident data
On a right angled road intersection with two way traffic, the total number of conflict points is______________?
A. 11
B. 6
C. 18
D. 24
Which of the following is indicated by a warning sign ?
A. level crossing
B. end of speed limit
C. no parking
D. overtaking prohibited
The most efficient traffic signal system is________________?
A. alternate system
B. simultaneous system
C. flexible progressive system
D. simple progressive system
Select the incorrect statement?
A. Clearance time is generally 3 to 5 seconds
B. Go or green time of a signal is the sum of stop and clearance intervals for the cross flow
C. Stop or red time of a signal is the sum of go and clearance intervals for the cross flow
D. The cycle length is normally 40 to 60 seconds for two phase signals
“Dead Slow” is a______________?
A. regulatory sign
B. informatory sign
C. warning sign
D. none of the above
The provision of traffic signals at intersections______________?
A. increases right angled and rear end collisions
B. reduces right angled and rear end collisions
C. reduces right angled collisions but may increase rear end collisions
D. reduces rear end collisions but may increase right angled collisions
The particular places where pedestrians are to cross the pavement are properly marked by the pavement marking known as________________?
A. turn markings
B. stop lines
C. crosswalk lines
D. lane lines
When two equally important roads cross roughly at right angles, the suitable shape of central island is________________?
A. circular
B. tangent
C. elliptical
D. turbine
Centre line markings are used_____________?
A. to indicate that overtaking is not permitted
B. in roadways meant for two way traffic
C. to designate traffic lanes
D. to designate proper lateral placement of vehicles before turning to different directions
The entrance and exit curves of a rotary have_______________?
A. equal radii but pavement width is more at entrance than at exit curve
B. equal radii and equal widths of pavement
C. equal pavement widths but radius is more at entrance curve than at exit curve
D. different radii and different widths of pavement
The maximum number of vehicles beyond which the rotary may not function efficiently is______________?
A. 500 vehicles per day
B. 500 vehicles per hour
C. 5000 vehicles per hour
D. 5000 vehicles per day
As per IRC recommendations, the average level of illumination on important roads carrying fast traffic is______________?
A. 15 lux
B. 10 lux
C. 20 lux
D. 30 lux
Maximum number of vehicles can be parked with_______________?
A. 30° angle parking
B. parallel parking
C. 45° angle parking
D. 90° angle parking
A traffic rotary is justified where______________?
A. number of intersecting roads is between 4 and 7
B. when traffic volume is less than 500 vehicles per hour
C. space is limited and costly
D. when traffic volume is more than 5000 vehicles per hour
When a number of roads are meeting at a point and only one of the roads is important, then the suitable shape of rotary is________________?
A. elliptical
B. tangent
C. circular
D. turbine
When the width of kerb parking space and width of street are limited, generally preferred parking system is________________?
A. parallel parking
B. 45° angle parking
C. 90° angle parking
D. 65° angle parking
The most economical lighting layout which is suitable for narrow roads is_______________?
A. single side lighting
B. central lighting system
C. staggered system
D. none of the above
In soils having same values of plasticity index, if liquid limit is increased, then_____________?
A. compressibility and permeability decrease and dry strength increases
B. compressibility, permeability and dry strength increase
C. compressibility, permeability and dry strength decrease
D. compressibility and permeability increase and dry strength decreases
Los Angeles testing machine is used to conduct______________?
A. abrasion test
B. attrition test
C. impact test
D. crushing strength test
The direct interchange ramp involves____________?
A. diverging to the left side and merging from right
B. diverging to the right side and merging from left
C. diverging to the right side and merging from right
D. diverging to the left side and merging from left
Which of the following tests measures the toughness of road aggregates ?
A. abrasion test
B. crushing strength test
C. impact test
D. shape test
If aggregate impact value is 20 to 30 percent, then it is classified as_______________?
A. strong
B. exceptionally strong
C. satisfactory for road surfacing
D. unsuitable for road surfacing
Percentage of free carbon in bitumen is______________?
A. equal to that in tar
B. less than that in tar
C. more than that in tar
D. none of the above
In CBR test the value of CBR is calculated at_______________?
A. 5.0 mm penetration only
B. 2.5 mm penetration only
C. 7.5 mm penetration only
D. both 2.5mm and 5.0 mm penetrations
The maximum allowable Los Angeles abrasion value for high quality surface course is_______________?
A. 20 %
B. 10 %
C. 30 %
D. 45 %
The ductility value of bitumen for suitability in road construction should not be less than____________?
A. 40 cm
B. 30 cm
C. 50 cm
D. 60 cm
Which of the following represents hardest grade of bitumen ?
A. 30/40
B. 80/100
C. 60/70
D. 100/120
Bitumen of grade 80/100 means______________?
A. its penetration value is 10 mm
B. its penetration value is 8 mm
C. its penetration value is 8 to 10 mm
D. its penetration value is 8 to 10 cm
Softening point of bitumen to be used for read construction at a place where maximum temperature is 40° C should be______________?
A. equal to 40°C
B. greater than 40°C
C. less-than 40°C
D. none of the above
The group index for a soil, whose liquid limit is 40 percent, plasticity index is 10 percent and percentage passing 75 micron IS sieve is 35, is______________?
A. 0
B. 5
C. 3
D. 7
Group index method of design of flexible pavement is_______________?
A. a semi empirical method
B. an empirical method based on physical properties of subgrade soil
C. an empirical method based on strength characteristics of subgrade soil
D. a theoretical method
Flexible pavement distribute the wheel load_____________?
A. through structural action
B. directly to subgrade
C. through a set of layers to the subgrade
D. none of the above
The method of design of flexible pavement as recommended by IRC is____________?
A. Westergaard method
B. CBR method
C. group index method
D. Benkelman beam method
Penetration test on bitumen is used for determining its_____________?
A. grade
B. ductility
C. viscosity
D. temperature susceptibility
The recommended grade of tar for grouting purpose is_______________?
A. RT-2
B. RT-1
C. RT.3
D. RT-5
The maximum limit of water absorption for aggregate suitable for road construction is____________?
A. 0.8 %
B. 0.6%
C. 0.4 %
D. 1.0 %
RC-2, MC-2 and SC-2 correspond to_______________?
A. same viscosity
B. viscosity in decreasing order from RC-2 to SC-2
C. viscosity in increasing order from RC-2 to SC-2
D. none of the above
For rapid curing cutbacks, the oil used is______________?
A. gasoline
B. light diesel
C. kerosene oil
D. heavy diesel
Bottom most layer of pavement is known as_____________?
A. base course
B. wearing course
C. sub-base course
D. subgrade
The number of repetitions, which the pavement thickness designed for a given wheel load should be able to support during the life of pavement is______________?
A. 1000
B. 100000
C. 10000
D. 1000000
Tyre pressure influences the______________?
A. total depth of pavement
B. quality of surface course
C. both of the above
D. none of the above
Select the correct statement______________?
A. More the value of CBR, greater thickness of pavement will be required
B. More the value of group index, less thickness of pavement will be required
C. Minimum and maximum values of group index can be 0 and 20 respectively
D. all of the above
Rigidity factor for a tyre pressure greater than 7 kg/cm2 is_______________?
A. greater than 1
B. less than 1
C. equal to 1
D. zero
Tie bars in cement concrete pavements are at______________?
A. contraction joints
B. expansion joints
C. warping joints
D. longitudinal joints
The function of an expansion joint in rigid pavements is to______________?
A. relieve shrinkage stresses
B. relieve warping stresses
C. resist stresses due to expansion
D. allow free expansion
The maximum spacing of contraction joints in rigid pavements is_____________?
A. 3.5 m
B. 2.5 m
C. 4.5 m
D. 5.5 m
The critical combination of stresses for corner region in cement concrete roads is____________?
A. load stress + frictional stress
B. load stress + warping stress + frictional stress
C. load stress + warping stress
D. load stress + warping stress frictional stress
If the group index value of subgrade is between 5 and 9, then the subgrade is treated as_____________?
A. good
B. very poor
C. poor
D. fair
The maximum thickness of expansion joint in rigid pavements is______________?
A. 0
B. 25 mm
C. 100 mm
D. 50 mm
The fundamental factor in the selection of pavement type is_____________?
A. subgrade soil and drainage conditions
B. type and intensity of traffic
C. climatic condition
D. availability of funds for the construction project
Maximum daily traffic capacity of bituminous pavements is______________?
A. 1000 tonnes per day
B. 500 tonnes per day
C. 1500 tonnes per day
D. 2000 tonnes per day
The aggregates required for one kilometer length of water bound macadam road per meter width and for 10 mm thickness is________________?
A. 10 cubic meter
B. 8 cubic meter
C. 12 cubic meter
D. 15 cubic meter
The binder normally used in flexible pavement construction is________________?
A. lime
B. cement
C. bitumen
D. none of the above
For the construction of water bound macadam roads, the correct sequence of operations after spreading coarse aggregates is________________?
A. dry rolling, application of filler, wet rolling and application of screening
B. dry rolling, wet rolling, application of screening and application of filler
C. dry rolling, application of screening, wet rolling and application of filler
D. dry rolling, application of screening, application of filler and wet rolling
When the bituminous surfacing is done on already existing black top road or over existing cement concrete road, the type of treatment to be given is________________?
A. prime coat
B. tack coat
C. seal coat
D. spray of emulsion
The most suitable equipment for compacting clayey soils is a_______________?
A. pneumatic tyred roller
B. smooth wheeled roller
C. sheep foot roller
D. vibrator
Most suitable material for highway embankments is______________?
A. granular soil
B. silts
C. organic soil
D. clays
The camber of shoulders in water bound macadam roads is________________?
A. equal to the cross slope of pavement
B. greater than the cross slope of pavement
C. less than the cross slope of pavement
D. zero
In highway construction, rolling starts from________________?
A. sides and proceed to centre
B. one side and proceed to other side
C. centre and proceed to sides
D. any of the above
In the penetration macadam construction, the bitumen is__________________?
A. sprayed after the aggregates are spread and compacted
B. sprayed before the aggregates are spread and compacted
C. premixed with aggregates and then spread
D. none of the above
Which of the following premix methods is used for base course ?
A. mastic asphalt
B. bituminous carpet
C. sheet asphalt
D. bituminous bound macadam
The suitable surfacing material for a bridge deck slab is________________?
A. bituminous carpet
B. sheet asphalt
C. mastic asphalt
D. rolled asphalt
The thickness of bituminous carpet varies from__________________?
A. 20 to 25 mm
B. 75 to 100 mm
C. 50 to 75 mm
D. 100 to 120 mm
Select the correct statement________________?
A. Prime coat treatment is given for plugging the voids in water bound macadam during bituminous road construction
B. Quantity of binder required for tack coat is less than that required for prime coat
C. Seal coat is the final coat over certain previous bituminous pavements
D. A bitumen primer is a high viscosity cutback
Which of the following is considered to be the highest quality construction in the group of black top pavements ?
A. mastic asphalt
B. bituminous carpet
C. sheet asphalt
D. bituminous concrete
Which of the following represents a carpet of sand-bitumen mix without coarse aggregates ?
A. bituminous carpet
B. sheet asphalt
C. mastic asphalt
D. bituminous concrete
The drain which is provided parallel to roadway to intercept and divert the water from hill slopes is known as_______________?
A. side drain
B. catchwater drain
C. sloping drain
D. cross drain
In hill roads the side drains arc provided________________?
A. only on the hill side of road
B. on both sides of road
C. only on the opposite side of hill
D. none of the above
The minimum design speed for hairpin bends in hill roads is taken as_______________?
A. 20 kmph
B. 40 kmph
C. 30 kmph
D. 50 kmph
In highway construction on super elevated curves, the rolling shall proceed from_________________?
A. centre towards the sides
B. sides towards the centre
C. lower edge towards the upper edge
D. upper edge towards the lower edge
The camber for hill roads in case of bituminous surfacing is adopted as________________?
A. 3%
B. 2.5%
C. 2%
D. 4%
