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4

A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be

A. Same

B. Double

C. Half

D. One-fourth

Correct Answer :

B. Double


Related Questions

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4

A beam is loaded as cantilever. If the load at the end is increased, the failure will occur

A. In the middle

B. At the tip below the load

C. At the support

D. Anywhere

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4

The heat energy stored in the gas and used for raising the temperature of the gas is known as

A. External energy

B. Internal energy

C. Kinetic energy

D. Molecular energy

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4

According to Kelvin-Planck's statement of second law of thermodynamics,

A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

B. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

C. It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body

D. None of the above

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4

Impact strength of a material is an index of its

A. Toughness

B. Tensile strength

C. Capability of being cold worked

D. Hardness

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4

Carbonisation of coal consists of

A. Drying and crushing the coal to a fine powder

B. Moulding the finely ground coal under pressure with or without a binding material

C. Heating the wood with a limited supply of air to temperature not less than 280°C

D. None of the above

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4

The stress developed in a material at breaking point in extension is called

A. Breaking stress

B. Fracture stress

C. Yield point stress

D. Ultimate tensile stress

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4

One molecule of oxygen consists of __________ atoms of oxygen.

A. 2

B. 4

C. 8

D. 16

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4

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A. Cut-off is increased

B. Cut-off is decreased

C. Cut-off is zero

D. Cut-off is constant

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4

The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates, and σt, τ and σc = Permissible tensile, shearing and crushing stresses respectively)

A. (p - 2d) t × σc

B. (p - d) t × τ

C. (p - d) t × σt

D. (2p - d) t × σt

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4

The hyperbolic process is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

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4

A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.

A. Same

B. Lower

C. Higher

D. None of these

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4

Strain is defined as the ratio of

A. Change in volume to original volume

B. Change in length to original length

C. Change in cross-sectional area to original cross-sectional area

D. Any one of the above

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4

The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

A. rγ - 1

B. 1 - rγ - 1

C. 1 - (1/r) γ/γ - 1

D. 1 - (1/r) γ - 1/ γ

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4

A beam which is fixed at one end and free at the other is called

A. Simply supported beam

B. Fixed beam

C. Overhanging beam

D. Cantilever beam

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4

When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

A. Wood charcoal

B. Bituminous coal

C. Briquetted coal

D. None of these

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4

According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

Which of the following statement is wrong?

A. The closed cycle gas turbine plants are external combustion plants.

B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.

C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.

D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

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4

A riveted joint in which the number otrivets decrease from innermost to outer most rows is called

A. Chain riveted joint

B. Diamond riveted joint

C. Crisscross riveted joint

D. Zigzag riveted joint

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4

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A. Carnot cycle

B. Stirling cycle

C. Otto cycle

D. Diesel cycle

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4

Which of the following statement is correct?

A. The heat and work are boundary phenomena

B. The heat and work represent the energy crossing the boundary of the system

C. The heat and work are path functions

D. All of the above

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4

All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Joule's law

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4

The buckling load for a given column depends upon

A. Area of cross-section of the column

B. Length and least radius of gyration of the column

C. Modulus of elasticity for the material of the column

D. All of the above

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4

The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is

A. Zero

B. wl/4

C. wl/2

D. wl²/2

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4

The temperature at which the volume of a gas becomes zero is called

A. Absolute scale of temperature

B. Absolute zero temperature

C. Absolute temperature

D. None of these

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4

The assumption made in Euler's column theory is that

A. The failure of column occurs due to buckling alone

B. The length of column is very large as compared to its cross-sectional dimensions

C. The column material obeys Hooke's law

D. All of the above

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4

Which of the following statement is incorrect?

A. The liquid fuels have higher calorific value than solid fuels

B. The solid fuels have higher calorific value than liquid fuels

C. A good fuel should have low ignition point

D. The liquid fuels consist of hydrocarbons

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4

The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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4

The unit of energy is S. I. units is

A. Joule (J)

B. Joule metre (Jm)

C. Watt (W)

D. Joule/metre (J/m)

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4

Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

A. 1/27th

B. 1/93th

C. 1/173th

D. 1/273th

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4

The heat and mechanical energies are mutually convertible. This statement was established by

A. Boyle

B. Charles

C. Joule

D. None of these