APPSC Civil and Mechanical Engineering 03 April 2019 Question paper with Answers Key- APPSC conducted Assistant Executive Engineers in Various Engineering Services exam on 03 April 2019 FN from 10.00 AM to 12.30 PM. Here we are providing some of the questions asked in APPSC Civil and Mechanical Engineering Paper.

Ideal effort required to run a machine is?

Less than actual effort

For no tension in column of diameter D, the eccentricity of the compressive load must be less than?

D/8

If diameter of a long column is reduced by 20%, the percentage reduction in Euler’s buckling load is

59

The buckling load for a column pinned at both ends is 12 kN. If the ends are fixed, the buckling load changes to

48 KN

The efficiency of lifting machine is 60% when an effort of 10 N is required to raise a load of 600 N. The velocity ratio of the machine is?

100

## APPSC Civil and Mechanical Engineering 03 April 2019 Paper

The law for an ideal machine is given by?

P=mW

Virtual work is the product of?

force and virtual displacement

A shaft is turns at 180 rpm under a torque of 150 Nm. Power transmitted is?

- kWp90

If the force is acting at an angle of 900 with the direction of motion of the body, the work done will be

Zero

If the work is done by the machine in a reverse direction, the machine is known as?

Reversible

A close coiled helical spring of stiffness 4N/mm is in series with another spring of stiffness 6 N/mm. What is the stiffness of composite spring?

2.4 N/mm

A spring with 25 active coils cannot be accommodated within a given space. Hence 10 coils of the spring are cut. What is the stiffness of the new spring?

1.66 times the original spring

__Civil and Mechanical Engineering__

### APPSC Civil and Mechanical Engineering 03 April 2019 Questions and answers

The ratio of kinematic viscosity (ν) to dynamic viscosity (µ) is known as?

Specific volume

What will be mass of air in a room of sides 4m x 4m x 4m at 100 kPa and 27ºC? [ Rair = 0.287 kJ/kg-K]?

74.332 kg

The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to internal hydrostatic pressure is?

2

The radius of gyration of a rectangular section (depth d, width b) from a centroidal axis parallel to the width is?

0.28d

What will be absolute pressure at point in flow field, if vacuum pressure is 0.07 MPa? [ Patm = 0.1 MPa]?

0.03 Mpa

What will be the internal pressure in the soap bubble of 2 cm diameter? [ σ = 0.08 N/m]?

32 N/m2 above atmospheric pressure

The absolute pressure at the depth of 10 m below the free surface of water will be [ρwater =1000 kg/m3 , g = 9.81 m/s2 , Patm = 0.1 MPa]?

198.1 kPa

#### APPSC Civil and Mechanical Engineering 03 April 2019 paper with Key

A stone weighs 500 N in air and 200 N in water. The specific gravity of stone will be?

1.67

The least radius of gyration of a ship is 8 m and metacentric height 75 cm. The time period of oscillation of the ship will be?

18.53 sec

Lagrangian method in fluid motion is?

To identify a fluid particle and its motion is described for entire duration of study

The momentum correction factor for fully developed turbulent flow through pipe is approximately given by?

1.01-1.04

A pipe of diameter 0.2 m is suddenly enlarged to a diameter 0.4 m. If flow rate is 250 liter/s, what will be the head loss due to this enlargement?

1.815 m

A flat plate 1.5 m x 1.5 m moves at 50 km/hr in stationary air of density 1.15 kg/m3 . Lift force will be [CL = 0.75]

187.1N

##### APPSC Civil and Mechanical Engineering Answers Key 03 April 2019

Which is not the element of hydroelectric power plant?

Condenser

Which is not the type of “spillways”?

Energy spillway

Which is not the pressure control valve?

Shuttle valve

Which is not the direction control valve?

Counterbalance valve

If the power to overcome aerodynamics drag of an aircraft remains the same, what will be the percentage increase in velocity, if there is a reduction of 15% in drag coefficient?

5.56 %

Shaft power for hydraulic turbine is given by [𝑃 = Power, 𝜌 = Density of fluid, 𝑄= Volume flow rate of fluid, 𝐻= Head of fluid]?

𝑃 = 𝜌𝑄𝑔H

‘Hydrograph’ depicts the variation in?

Discharge with time

APPSC Civil and Mechanical Engineering 03 April 2019 Full Question Paper& Key