Know your strengths and practice your concepts with this quiz on NHPC JE Recruitment 2021. This quiz for NHPC JE Recruitment 2021 is designed specially according to NHPC Syllabus 2021.
Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. For a laminar flow between two parallel fixed plates, maximum velocity observed is 3 m/s. Average velocity of the flow will be
(a) 1 m/s
(b) 1.5 m/s
(c) 2 m/s
(d) 2.5 m/s
Q2. Angles of 45° with a chain line may be set out with
(a) Optical square
(b) French square
(c) Open cross staff
(d) Prismatic square
Q3. In a diagonal scale only
(a) Units can be shown
(b) Units, tenths can be shown
(c) Units, tenths and hundredth can be shown
(d) Units, tenths, hundredths and thousandths can be shown
Q4. In tri-axial compression test, the deviator stress is given by
(c) 1/2 (σ_1+σ_3)
(d) 1/2 (σ_1-σ_3)
Q5. Retarders are used for:
(a) Construction of high-rise building
(b) Repair works
(c) Cold weather conditions
(d) Grouting deep oil wells
Q6. In an experiment it found that the bulk modulus of a material is equal to its shear modulus. This Poisson’s ratio is.
Sol. Vmax = 3 m/sec
Vavg = ?
In Parallel fixed plate
Vmax = 1.5 × Vavg.
3 = 1.5 × Vavg.
Vavg = 3/1.5
Vavg = 2 m/sec
Sol. Cross staff is an instrument used for setting out right angles. There are three types of cross – staff-
1. Open cross staff
2. French cross staff
3. Adjustable cross staff
Note → French cross staff is used for setting out either 45° angle and 90° or right angle.
Sol. Diagonal scale → In this scale three successive dimension can be measured at a time like meter, decimeter and centimeter. In this case only units, tenths and hundredths can be shown.
Plane scale → In this scale two successive dimension can be measure at a time. Like meter and decimeter.
Sol. In tri-axial compression test →
Minor principal stress = confining pressure
Major Principal stress σ_1=σ_2+σ_d
σ_d is deviator stress
∵ ▭(σ_d=σ_1-σ_3 )
Sol. Retarders are used to delay the hydration of cement and extend the initial setting time. It is therefore used to grout deep oil wells, transport readymade concrete (RMC) and avoid cold joints.
Sol. Given bulk modulus (K) = Shear modulus (G)
Poisson’s ratio (μ)=(3K-2G)/(6K+2G)=(3-2)/(6+2)=1/8=0.125