Test: Thermodynamics - 3 - Mechanical Engineering MCQ

A what distance r from center of pipe of radiusR does average velocity occurs in a laminar flow

The shear force on a plate of area 1m² whenlubricating oil of viscosity 9.81 poise. Filled b/wtwo parallel plate 1 cm apart moving with relatedvelocity of 2m/s.

Power transmitted through a pipe is given by :-

Q → Discharge
H → Net head Available
h_f → Head loss due to friction in pipe

If the end of a pipe is suddenly closed which phenomenon would occur.

Air is flowing over a flat plate with a free streamvelocity of 24 m/s and its kinematic viscosity is 75 × 10^-6 m²/s. It at a particular point reynoldsno. is 24000, the distance of the point from leading edge will be,

Which of the following chart is relation betweenfriction factor, reynolds no. and relative roughness

For towing of ships in a sea which of the followingmodel law would you use

The drag force encountered by a fluid on a bodyimmersed in the fluid is due to

When pressure drag is greater than that of frictiondrag the shape of the body is

The force on a curved place due to a jet of area 'a' velocity 'v' and angle of deflection 'o' is .

Heat transferred at constant pressure _____ the enthalpy of a system.

Torque can be defined as

If h_m = mechanical efficiency
h_h = hydraulic efficiency
h_g = generating efficiency
h_o = overall efficiency

Which of the following is true: -

Degree of reaction of pelton turbine is

For pelton turbine with blade angle ( Ø )maximum efficiency when u = v/2 is given by

Francis Turbine is a

a. Inward flow
b. outward flow
c. radial
d. Tangential
e. Reaction
f. Impulse

It D_o = Dia at outlet
D_n = Dia of hub
V_f = Flow velocity
V_w = whrill velocity
V = Absolute velocity Flow through an axial turbine can be given as

No. of vanes in a radial turbine and axial turbineare respectively

The discharge of double acting Reciprocating pump can be given as

The speed ratio of pelton wheel operating undera head of 900 m is 0.45. what is the peripheralvelocity of the turbine wheel.

Cavitation in hydraulic machines occurs at
1. Exit of pump
2. Entry of turbine

Which of the statements is correct

Consider the following data for the performance of a centrifugal pump.
Speed = 1000 rpm.
flow = 50 liters persecond
head = 20 m
power = 10 kW.

It the speed is increased to 1500 rpm, the powerwill be nearly equal to