MCQs

Mechanical Engineering MCQs with Explanations

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2051Mechanical EngineeringMedium

Buoyant force is________?

Athe resultant force on a body due to the fluid surrounding it

Bequal to the volume of liquid displaced

Cnone of the above

Dresultant force acting on a floating body

Eforce necessary to keep a body in equilibrium

Correct answer

A. the resultant force on a body due to the fluid surrounding it

Explanation

The correct answer is the resultant force on a body due to the fluid surrounding it.

2052Mechanical EngineeringMedium

The flow in which each liquid particle has a definite path and their paths do not cross each other is called________?

Astreamline flow

Bsteady flow

Cone dimensional flow

Duniform flow

Eturbulent flow

Correct answer

A. streamline flow

Explanation

The correct answer is streamline flow.

2053Mechanical EngineeringMedium

Choose the correct statement ________?

Agas turbines can be used to generate power only

Bgas turbines have high standby losses and require lot of maintenance

Cgas turbine is capable of rapid start up and loading

Dgas turbines have flat efficiency at part loads

Egas turbine requires lot of cooling water

Correct answer

C. gas turbine is capable of rapid start up and loading

Explanation

The correct answer is gas turbine is capable of rapid start up and loading.

2054Mechanical EngineeringMedium

Iso-oct,ne________?

Ahas octane number of 100

Bhas octane number of 50

Chas octane number of 0

Dis an index of detonation quality

Eis an index of knocking quality

Correct answer

A. has octane number of 100

Explanation

The correct answer is has octane number of 100.

2055Mechanical EngineeringMedium

Fusible plug for boilers is made of fusible metal containing tin, lead, and________?

Anickel

Bcopper

Cbismuth

Daluminium

Eiron

Correct answer

C. bismuth

Explanation

The correct answer is bismuth.

2056Mechanical EngineeringMedium

For obtaining high COP, the pressure range of compressor should be________?

Ahigh

Bany value

Clow

Doptimum

Ethere is no such criterion

Correct answer

C. low

Explanation

The correct answer is low.

2057Mechanical EngineeringMedium

Klein’s construction can be used to determine acceleration of various parts when the crank is at________?

Ainner dead centre

Bat 45° to the line of the stroke

Call of the above

Douter dead centre

Eright angles to the link of the stroke

Correct answer

C. all of the above

Explanation

The correct answer is all of the above.

2058Mechanical EngineeringMedium

To obviate axial thrust, following gear drive is used________?

Asingle helical gear in which one of the teeth of helix angle a is more

Bdouble helical gears having opposite teeth

Cdouble helical gears having identical teeth

Dnone of the above

Emutter gears

Correct answer

B. double helical gears having opposite teeth

Explanation

The correct answer is double helical gears having opposite teeth.

2059Mechanical EngineeringMedium

The speed of sound in a ideal gas varies directly as its________?

Amodulus of elasticity

Bpressure

Cabsolute temperature

Dtemperature

Edensity

Correct answer

C. absolute temperature

Explanation

The correct answer is absolute temperature.

2060Mechanical EngineeringMedium

The diameter of cylindrical shell of the Lancashire boiler is of the order of________?

A1.75 to 2.75 m

B2 to 4 m

C1 tp 1.25m

D2.25 to 4.5 m

E1 to 1.75 m

Correct answer

A. 1.75 to 2.75 m

Explanation

The correct answer is 1.75 to 2.75 m.

Buoyant force is________?

Athe resultant force on a body due to the fluid surrounding it

Bequal to the volume of liquid displaced

Cnone of the above

Dresultant force acting on a floating body

Eforce necessary to keep a body in equilibrium

Correct answer

A. the resultant force on a body due to the fluid surrounding it

Explanation

The correct answer is the resultant force on a body due to the fluid surrounding it.

Choose the correct statement ________?

Agas turbines can be used to generate power only

Bgas turbines have high standby losses and require lot of maintenance

Cgas turbine is capable of rapid start up and loading

Dgas turbines have flat efficiency at part loads

Egas turbine requires lot of cooling water

Correct answer

C. gas turbine is capable of rapid start up and loading

Explanation

The correct answer is gas turbine is capable of rapid start up and loading.

To obviate axial thrust, following gear drive is used________?

Asingle helical gear in which one of the teeth of helix angle a is more

Bdouble helical gears having opposite teeth

Cdouble helical gears having identical teeth

Dnone of the above

Emutter gears

Correct answer

B. double helical gears having opposite teeth

Explanation

The correct answer is double helical gears having opposite teeth.