AP ECET MECHANICAL ENGINEERING Multiple Choice Questions (MCQs)

76. Which of the following is the study of fluid motion and its behavior?

A) Fluid Statics

B) Fluid Kinematics

C) Fluid Dynamics

D) Fluid Mechanics

Answer: B) Fluid Kinematics

77. The pressure at a point in a fluid is the same in all directions when the fluid is:

A) In motion

B) At rest

C) At a high velocity

D) In a steady state

Answer: B) At rest

78. Which of the following is true for an incompressible fluid?

A) Its density changes with pressure

B) Its density remains constant

C) It has no viscosity

D) It cannot flow in pipes

Answer: B) Its density remains constant

79. The term ‘discharge’ in fluid flow refers to:

A) The rate of change of fluid pressure

B) The total volume of fluid passing through a section per unit time

C) The velocity of fluid flow

D) The velocity head at a point in the fluid flow

Answer: B) The total volume of fluid passing through a section per unit time

80. The Bernoulli's equation applies to:

A) Compressible fluids only

B) Incompressible, steady flow of ideal fluids

C) Steady flow of real fluids

D) Turbulent flow of real fluids

Answer: B) Incompressible, steady flow of ideal fluids

81. The phenomenon of cavitation occurs in:

A) Reciprocating pumps only

B) Centrifugal pumps only

C) Both reciprocating and centrifugal pumps

D) Fluid reservoirs

Answer: B) Centrifugal pumps only

82. In a hydraulic turbine, the primary function of the runner is to:

A) Increase the pressure of the fluid

B) Convert fluid energy to mechanical energy

C) Reduce the temperature of the fluid

D) Measure the flow rate

Answer: B) Convert fluid energy to mechanical energy

83. Which of the following pumps is best suited for pumping large quantities of fluid at low pressure?

A) Centrifugal pump

B) Reciprocating pump

C) Gear pump

D) Screw pump

Answer: A) Centrifugal pump

84. The discharge in a centrifugal pump is proportional to:

A) The square of the speed

B) The cube of the speed

C) The first power of the speed

D) The square root of the speed

Answer: C) The first power of the speed

85. A reciprocating pump works on the principle of:

A) Fluid displacement

B) Fluid acceleration

C) Centrifugal force

D) Pressure reduction

Answer: A) Fluid displacement

86. Which of the following is used to control the flow direction in a hydraulic circuit?

A) Valve

B) Actuator

C) Reservoir

D) Pump

Answer: A) Valve

87. Which of the following is not an actuator in hydraulic systems?

A) Cylinder

B) Motor

C) Valve

D) Piston

Answer: C) Valve

88. The velocity of fluid flow through a pipe is highest at:

A) The center of the pipe

B) The edges of the pipe

C) At the inlet

D) At the outlet

Answer: A) The center of the pipe

89. The efficiency of a centrifugal pump is maximum when:

A) It operates at shutoff head

B) It operates at its design point

C) The fluid temperature is very low

D) The speed is very high

Answer: B) It operates at its design point

90. Pneumatic circuits are primarily used for:

A) Controlling fluid pressure

B) Moving fluid

C) Performing tasks requiring less force and high speed

D) Generating power

Answer: C) Performing tasks requiring less force and high speed