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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2901. |
Kelvin-Planck's law deals with |
| A. | conservation of work |
| B. | conservation of heat |
| C. | conversion of heat into work |
| D. | conversion of work into heat |
| Answer» D. conversion of work into heat | |
| 2902. |
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle |
| A. | combustion is at constant volume |
| B. | expansion and compression are isentropic |
| C. | maximum temperature is higher |
| D. | heat rejection is lower |
| Answer» E. | |
| 2903. |
A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is |
| A. | 30 kJ |
| B. | 54 kJ |
| C. | 84 kJ |
| D. | 114 kJ |
| Answer» C. 84 kJ | |
| 2904. |
The example of snag grinding is |
| A. | trimming the surface left by sprues and risers on castings |
| B. | grinding the parting line left on castings |
| C. | removing flash on forgings |
| D. | all of these |
| Answer» E. | |
| 2905. |
The angle between the shear plane and __________ is called shear angle. |
| A. | work surface |
| B. | tool face |
| Answer» B. tool face | |
| 2906. |
In determining the various forces on the chip, Merchant assumed that the |
| A. | cutting edge of the tool is sharp and it does not make any flank contact with the workpiece |
| B. | only continuous chip without built-up-edge is produced |
| C. | cutting velocity remains constant |
| D. | all of the above |
| Answer» E. | |
| 2907. |
The type of reamer used for reaming soft aluminium or copper, is |
| A. | straight fluted reamer |
| B. | left hand spiral fluted reamer |
| C. | right hand spiral fluted reamer |
| D. | any one of these |
| Answer» C. right hand spiral fluted reamer | |
| 2908. |
Up milling is also called conventional milling. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2909. |
The tool material, for faster machining, should have |
| A. | wear resistance |
| B. | red hardness |
| C. | toughness |
| D. | all of these |
| Answer» E. | |
| 2910. |
Dielectric is used in |
| A. | electro-chemical machining |
| B. | ultra-sonic machining |
| C. | electro-discharge machining |
| D. | laser machining |
| Answer» D. laser machining | |
| 2911. |
Ceramic tools has greater tool life than carbide tools. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2912. |
Fixtures are used |
| A. | for holding and guiding the tool in drilling, reaming or tapping operations |
| B. | for holding the work in milling, grinding, planing or turning operations |
| C. | to check the accuracy of workpiece |
| D. | none of the above |
| Answer» C. to check the accuracy of workpiece | |
| 2913. |
According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant. |
| A. | directly |
| B. | indirectly |
| Answer» B. indirectly | |
| 2914. |
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called |
| A. | isothermal process |
| B. | hyperbolic process |
| C. | adiabatic process |
| D. | polytropic process |
| Answer» B. hyperbolic process | |
| 2915. |
Which of the following gas has the highest calorific value? |
| A. | Coal gas |
| B. | Producer gas |
| C. | Mond gas |
| D. | Blast furnace gas |
| Answer» B. Producer gas | |
| 2916. |
According to Avogadro's law |
| A. | the product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | the sum of partial pressure of the mixture of two gases is sum of the two |
| C. | equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | all of the above |
| Answer» D. all of the above | |
| 2917. |
When the gas is cooled at constant pressure, |
| A. | its temperature increases but volume decreases |
| B. | its volume increases but temperature decreases |
| C. | both temperature and volume increases |
| D. | both temperature and volume decreases |
| Answer» E. | |
| 2918. |
The oxygen atom is __________ times heavier than the hydrogen atom. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 2919. |
The work ratio of a gas turbine plant is given by |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/253-233-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/thermodynamics/253-233-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/253-233-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/thermodynamics/253-233-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/thermodynamics/253-233-2.png"> | |
| 2920. |
The loss of kinetic energy during elastic impact is zero. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2921. |
The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ . |
| A. | less than |
| B. | greater than |
| Answer» B. greater than | |
| 2922. |
Which of the following is a scalar quantity? |
| A. | Force |
| B. | Speed |
| C. | Velocity |
| D. | Acceleration |
| Answer» C. Velocity | |
| 2923. |
The unit of energy in S.I. units is |
| A. | dyne |
| B. | watt |
| C. | kg-m |
| D. | joule |
| Answer» E. | |
| 2924. |
The angle of inclination of the plane at which the body begins to move down the plane, is called |
| A. | angle of friction |
| B. | angle of repose |
| C. | angle of projection |
| D. | none of these |
| Answer» B. angle of repose | |
| 2925. |
The Rankine's constant for a mild steel column with both ends hinged is |
| A. | 1/750 |
| B. | 1/1600 |
| C. | 1/7500 |
| D. | 1/9000 |
| Answer» D. 1/9000 | |
| 2926. |
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to |
| A. | area of the triangle |
| B. | twice the area of the triangle |
| C. | half the area of the triangle |
| D. | none of these |
| Answer» C. half the area of the triangle | |
| 2927. |
The operation of smoothing and squaring the surface around a hole is known as |
| A. | counter-sinking |
| B. | counter-boring |
| C. | trepanning |
| D. | spot facing |
| Answer» E. | |
| 2928. |
The cutting speed of a drill depends upon the |
| A. | material of drill |
| B. | type of material to be drilled |
| C. | quality of surface finish desired |
| D. | all of these |
| Answer» E. | |
| 2929. |
A grinding wheel is said to be of __________ if it holds the abrasive grains more securely. |
| A. | soft grade |
| B. | medium grade |
| C. | hard grade |
| Answer» D. | |
| 2930. |
In ultra-sonic machining, tool is made of |
| A. | tungsten carbide |
| B. | brass or copper |
| C. | diamond |
| D. | stainless steel |
| Answer» C. diamond | |
| 2931. |
Crater wear is mainly due to the phenomenon known as |
| A. | adhesion of metals |
| B. | oxidation of metals |
| C. | diffusion of metals |
| D. | all of these |
| Answer» D. all of these | |
| 2932. |
The width of cutting edge of a parting-off tool varies from |
| A. | 3 to 12 mm |
| B. | 5 to 20 mm |
| C. | 8 to 30 mm |
| D. | 15 to 40 mm |
| Answer» B. 5 to 20 mm | |
| 2933. |
The lip clearance angle should decrease towards the centre of the drill than at the circumference. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 2934. |
The abrasive recommended for grinding materials of low tensile strength is |
| A. | silicon carbide |
| B. | aluminium oxide |
| C. | sand stone |
| D. | diamond |
| Answer» B. aluminium oxide | |
| 2935. |
Hard and tough materials like cast iron should be turned at |
| A. | slow speed |
| B. | high speed |
| C. | any speed |
| D. | certain specific speed |
| Answer» B. high speed | |
| 2936. |
In a shaper |
| A. | tool is stationary and work reciprocates |
| B. | work is stationary and tool reciprocates |
| C. | tool moves over stationary work |
| D. | tool moves over reciprocating work |
| Answer» C. tool moves over stationary work | |
| 2937. |
In drilling brass, a drill with |
| A. | zero helix angle is used |
| B. | low helix angle is used |
| C. | high helix angle is used |
| D. | any helix angle can be used |
| Answer» C. high helix angle is used | |
| 2938. |
When the shear angle is large |
| A. | path of shear is short and chip is thin |
| B. | path of shear is large and chip is thick |
| C. | path of shear is short and chip is thick |
| D. | path of shear is large and chip is thin |
| Answer» B. path of shear is large and chip is thick | |
| 2939. |
The cutting speed for counter-boring should be __________ that of drilling operation. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 2940. |
The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2941. |
When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2942. |
One molecule of oxygen consists of __________ atoms of oxygen. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
| 2943. |
One kg of carbon monoxide requires 4/7 kg of oxygen and produces |
| A. | 11/3 kg of carbon dioxide gas |
| B. | 7/3 kg of carbon monoxide gas |
| C. | 11/7 kg of carbon dioxide gas |
| D. | 8/3 kg of carbon monoxide gas |
| Answer» D. 8/3 kg of carbon monoxide gas | |
| 2944. |
When a gas is heated at constant volume |
| A. | its temperature will increase |
| B. | its pressure will increase |
| C. | both temperature and pressure will increase |
| D. | neither temperature nor pressure will increase |
| Answer» D. neither temperature nor pressure will increase | |
| 2945. |
The entropy may be expressed as a function of |
| A. | pressure and temperature |
| B. | temperature and volume |
| C. | heat and work |
| D. | all of these |
| Answer» B. temperature and volume | |
| 2946. |
The polytropic index (n) is given by |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-126-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-126-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-126-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-126-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/thermodynamics/244-126-3.png"> | |
| 2947. |
The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels. |
| A. | higher |
| B. | lower |
| Answer» B. lower | |
| 2948. |
The mass of carbon per kg of flue gas is given by |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/260-318-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/thermodynamics/260-318-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/260-318-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/thermodynamics/260-318-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/thermodynamics/260-318-2.png"> | |
| 2949. |
When the gas is heated at constant pressure, the heat supplied |
| A. | increases the internal energy of the gas |
| B. | increases the temperature of the gas |
| C. | does some external work during expansion |
| D. | Both (B) and (C) |
| Answer» E. | |
| 2950. |
A cycle consisting of two constant pressure and two isothermal processes is known as Ericsson cycle. |
| A. | True |
| B. | False |
| Answer» B. False | |