MECHANICAL ENGINEERING MCQ SECTION 15

141. Harmful radiation emitted by the sun is ______.

(A) visible

(B) infra-red

(C) ultra-violet

(D) radio waves

142. A solar cell converts ______.

(A) heat energy into electrical energy

(B) solar energy into electrical energy

(C) heat energy into light energy

(D) solar energy into light energy

143. Poise is the unit of

(A) surface tension

(B) capillarity

(C) viscosity

(D) shear stress in fluids

144. Which of the following instrument can be used for measuring speed of an aeroplane ?

(A) Venturimeter

(B) Orifice plate

(C) Rotameter

(D) Pitot tube

145. Flow occurring in a pipeline when a valve is being opened is

(A) steady

(B) unsteady

(C) laminar

(D) vortex

146. Two pipe systems can be said to be equivalent, when the following quantities are same

(A) friction loss and flow

(B) length and diameter

(C) flow and length

(D) friction factor and diameter

147.Cavitation is caused by

(A) high velocity

(B) high pressure

(C) weak material

(D) low pressure

148. Centrifugal pump is started with its delivery valve

(A) kept fully closed

(B) kept fully open

(C) irrespective of any position

(D) kept 50% open

149. Multistage centrifugal pumps are used to obtain

(A) high discharge

(B) high head

(C) pumping of viscous fluids

(D) high head and high discharge

150. Low specific speed of turbine implies it is

(A) propeller turbine

(B) Francis turbine

(C) impulse turbine

(D) none of these