McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
The maximum horse power of Fiat engine is around |
| A. | 11 |
| B. | 15 |
| C. | 40 to 50 |
| D. | 25 to 30 |
| E. | 60 to 80 |
| Answer» C. 40 to 50 | |
| 102. |
An air fuel ratio 8 will have |
| A. | Chemically correct air |
| B. | Excess fuel |
| C. | Excess air |
| D. | Any of above |
| E. | None of above |
| Answer» B. Excess fuel | |
| 103. |
Consumption of diesel in a diesel engine per BHP per hour is in the range |
| A. | 185-210 gm |
| B. | 215-300 gm |
| C. | 500-800 gm |
| D. | 100-150 gm |
| E. | 150-180 gm |
| Answer» A. 185-210 gm | |
| 104. |
When a receiver is provided in a compound engine, it can be concluded that |
| A. | The engine is non-condensing type |
| B. | The engine is condensing type |
| C. | The cranks are at 90? to each other |
| D. | The cranks are at 180? to each other |
| E. | None of the above |
| Answer» C. The cranks are at 90? to each other | |
| 105. |
The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is |
| A. | Decelerating |
| B. | Accelerating |
| C. | Cruising at low speeds |
| D. | Idling |
| E. | Cruising at high speeds |
| Answer» D. Idling | |
| 106. |
A gas turbine works on |
| A. | Brayton cycle |
| B. | Joule cycle |
| C. | Carnot cycle |
| D. | Rankine cycle |
| E. | Erricson cycle |
| Answer» A. Brayton cycle | |
| 107. |
Isolate the factor on which bursting pressure of boiler does not depend |
| A. | Tensile strength of the shell |
| B. | Thickness of the shell |
| C. | Diameter of the shell |
| D. | Shear strength of shell material |
| E. | None of the above |
| Answer» D. Shear strength of shell material | |
| 108. |
Total solid impurities in feed water for a boiler depend upon |
| A. | Boiler pressure |
| B. | Quantity of steam to be generated |
| C. | Type of fuel available |
| D. | Quantity of steam |
| E. | None of the above |
| Answer» A. Boiler pressure | |
| 109. |
A cold short metal is |
| A. | One that can not be heated above 500?C |
| B. | One that cannot be welded |
| C. | One that cannot be worked under the hammer or by rolling or bent when cold without racking at the edges |
| D. | One that cannot be easily rolled or bent at low temperatures |
| E. | None of the above |
| Answer» B. One that cannot be welded | |
| 110. |
The thermal efficiency of steam turbine can be increased by |
| A. | Increasing the pressure range |
| B. | Reheating |
| C. | Regeneration |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 111. |
If the pressures at the beginning and end of compression in an Otto cycle engine are 1 kg/cm2 and 8 kg/cm2 respectively the air standard efficiency will be |
| A. | 45% |
| B. | 50% |
| C. | 57% |
| D. | 50% |
| E. | 40% |
| Answer» D. 50% | |
| 112. |
In a reaction turbine which steam flows through the moving blades |
| A. | Pressure reduces while velocity increases |
| B. | Both velocity as well as pressure decreases |
| C. | Pressure increases |
| D. | Pressure increases while velocity reduces |
| E. | Velocity increases |
| Answer» B. Both velocity as well as pressure decreases | |
| 113. |
Which of the following functions reduces the irreversibility of a cycle? |
| A. | high speed operation |
| B. | low exhaust pressures |
| C. | regeneration |
| D. | use of lower pressure |
| E. | Carbon dioxide |
| Answer» C. regeneration | |
| 114. |
The intercept of Willian's line on Y-axis at the origin, gives |
| A. | Missing quantity |
| B. | Frictional horse power |
| C. | No load steam consumption |
| D. | Idling speed |
| E. | All of the above |
| Answer» D. Idling speed | |
| 115. |
In a throttle governed single cylinder steam engine 5 I.H.P. is developed when steam consumption is 50 kg per hour and 2 I.H.P. is developed when the steam consumption is 26 kg per hour. The steam consumptions when the engine develops 4 I.H.P. will be |
| A. | 46 |
| B. | 42 kg |
| C. | 40 kg |
| D. | 38 kg |
| E. | 37 kg |
| Answer» B. 42 kg | |
| 116. |
The efficiency of a jet propulsion unit is generally high at altitudes of |
| A. | 7500 metres |
| B. | 1000 metres |
| C. | 5000 metres |
| D. | 9000 metres |
| E. | More than 10,000 metres |
| Answer» E. More than 10,000 metres | |
| 117. |
Which of the following is not used as ignition accelerator for diesel engine fuel? |
| A. | Ethyl nitrate |
| B. | Methyl alcohol |
| C. | Acetone peroxise |
| D. | Isoamyl nitrate |
| E. | All of the above |
| Answer» B. Methyl alcohol | |
| 118. |
The ideal output velocity of steam from a nozzle having an enthalpy drop of 100 kcal/kg will be |
| A. | 1098 m/s |
| B. | 1000 m/s |
| C. | 600 m/s |
| D. | 915 m/s |
| E. | 789 m/s |
| Answer» D. 915 m/s | |
| 119. |
In a four stroke engine if a valve opens 25? before B.D.C. and closes 10? after T.D.C. the valve should be |
| A. | Puppet valve |
| B. | Cam valve |
| C. | Spring valve |
| D. | Inlet valve |
| E. | Exhaust valve |
| Answer» E. Exhaust valve | |
| 120. |
If the air clearance is removed in a carburettor engine the fuel air ratio will be |
| A. | Higher |
| B. | Lower |
| C. | Not affected |
| D. | Fluctuating |
| E. | None of the above |
| Answer» B. Lower | |
| 121. |
A fan is being used under certain known conditions. If the speed of fan is doubled the air displaced by the fan |
| A. | Will remain the same |
| B. | Will be doubled |
| C. | Will be four times the original displacement |
| D. | will be either times the original displacement |
| E. | None of the above |
| Answer» B. Will be doubled | |
| 122. |
The maximum temperature in a gas turbine is of the order of |
| A. | 700?C |
| B. | 2000?C |
| C. | 2500?C |
| D. | 1500?C |
| E. | 1000?C |
| Answer» A. 700?C | |
| 123. |
Which of the following is a part of reciprocating steam engine and not a part of steam turbine plant? |
| A. | Condenser |
| B. | Governor |
| C. | Pressure gauge |
| D. | Cross head |
| E. | All of the above |
| Answer» D. Cross head | |
| 124. |
For same output and same compression ratio four stroke SI engines as compared to two stroke engines have |
| A. | Higher fuel consumption |
| B. | Lower thermal efficiency |
| C. | Higher thermal efficiency |
| D. | Higher exhaust temperatures |
| E. | None of the above |
| Answer» C. Higher thermal efficiency | |
| 125. |
For the same temperature limits and heat input, the most efficient cycle is |
| A. | Carnot |
| B. | Otto |
| C. | Diesel |
| D. | Brayton |
| E. | All of the above have same efficiency |
| Answer» A. Carnot | |
| 126. |
The power for the propulsion of ship is provided by |
| A. | Diesel engines |
| B. | Steam turbines |
| C. | Either (A) and (B) above |
| D. | Batteries |
| E. | Any of the above |
| Answer» C. Either (A) and (B) above | |
| 127. |
The steam trap is used to |
| A. | Superheat the steam |
| B. | Separate condensate from steam |
| C. | Convert superheated steam into the steam |
| D. | Condense the steam |
| E. | Add moisture to steam |
| Answer» B. Separate condensate from steam | |
| 128. |
Piston ring are plated with chromium, cadmium or phosphate to |
| A. | Reduce wear and eliminate scuffing |
| B. | Improve heat transfer |
| C. | Improve surface finish |
| D. | Prevent clogging |
| E. | Reduce clearance, between rings and cylinder |
| Answer» A. Reduce wear and eliminate scuffing | |
| 129. |
More test is conducted on |
| A. | Engines with two flywheels |
| B. | Multi-cylinder engines |
| C. | Single cylinder engines |
| D. | High speed engines |
| E. | Slow speed engines |
| Answer» B. Multi-cylinder engines | |
| 130. |
In oil burners air is supplied |
| A. | To assist inflow of oil |
| B. | To prevent clogging of burner |
| C. | To improve combustion efficiency |
| D. | To uniformly spray oil in combustion chamber |
| E. | None of the above |
| Answer» C. To improve combustion efficiency | |
| 131. |
In a compression ignition engine higher combustion chamber wall temperature will |
| A. | Reduce knocking tendency |
| B. | Increase knocking tendency |
| C. | Have no effect |
| D. | Reduce exhaust temperature |
| E. | None of the above |
| Answer» A. Reduce knocking tendency | |
| 132. |
Clapeyron equation is applicable |
| A. | To systems in equilibrium |
| B. | To change of boiling point |
| C. | To change of melting point |
| D. | For change of state when two phases are in equilibrium |
| E. | All of the above |
| Answer» D. For change of state when two phases are in equilibrium | |
| 133. |
In a system if base load is same as maximum demand, the load factor will be |
| A. | 1 |
| B. | 1 percent |
| C. | 0.5 percent |
| D. | Infinity |
| E. | Zero |
| Answer» A. 1 | |
| 134. |
Reheating of steam for steam turbine cycle is done primarily to |
| A. | Reduce dryness fraction of exhaust steam |
| B. | Increase the pressure of steam in the condenser |
| C. | Increase boiler chimney draught |
| D. | Improve thermal efficiency of the plant |
| E. | All of the above |
| Answer» D. Improve thermal efficiency of the plant | |
| 135. |
Morse test is conducted on |
| A. | Multi-cylinder engines |
| B. | Vertical engines |
| C. | Horizontal engines |
| D. | Vet engines |
| E. | Single cylinder engines |
| Answer» A. Multi-cylinder engines | |
| 136. |
Capacitor kVA required to bring the power factor of a 500 kW load 70% to 85% would be |
| A. | 100 kVA |
| B. | 250 kVA |
| C. | 300 kVA |
| D. | 150 kVA |
| E. | 200 kVA |
| Answer» E. 200 kVA | |
| 137. |
The function of a condenser in a steam power plant is |
| A. | To preheat feed water with exhaust steam |
| B. | To condense feed water |
| C. | To utilise heat of exhaust steam |
| D. | To act as a heat sink |
| E. | To reduce back pressure |
| Answer» E. To reduce back pressure | |
| 138. |
For diatomic gas flowing through a nozzle the critical pressure ratio is given by |
| A. | 0.75 |
| B. | 1 |
| C. | 3.546 |
| D. | 0.528 |
| E. | 0.577 |
| Answer» C. 3.546 | |
| 139. |
Suri-transmission is |
| A. | hydro-mechanical |
| B. | mechanical-electrical |
| C. | Carbon dioxide |
| D. | electro-pneumatic |
| E. | hydro-pneumatic |
| Answer» A. hydro-mechanical | |
| 140. |
The temperature of the blades of a gas turbine may be closer to |
| A. | 350?C |
| B. | 212?C |
| C. | 1200?C |
| D. | 600?C |
| E. | 100?C |
| Answer» C. 1200?C | |
| 141. |
Compression ratio for diesel engines is generally in the range |
| A. | 25 to 30 |
| B. | 5 to 10 |
| C. | 22 to 25 |
| D. | 14 to 22 |
| E. | 10 to 14 |
| Answer» D. 14 to 22 | |
| 142. |
In case of pressure compounded impulse turbine, for the steam while flowing through the nozzle of second stage |
| A. | Pressure drops while velocity increases |
| B. | Pressure increases while velocity decreases |
| C. | Pressure and velocity both increase |
| D. | Pressure increases |
| E. | Pressure and velocity both decrease |
| Answer» A. Pressure drops while velocity increases | |
| 143. |
Which spark plug will have lower heat rating |
| A. | W 350 T1 |
| B. | W 300 T1 |
| C. | W 95 T1 |
| D. | W 145 T1 |
| E. | W 225 T1 |
| Answer» C. W 95 T1 | |
| 144. |
In a petrol engine fuel lock generally occurs in |
| A. | suction manifold |
| B. | Carbon dioxide |
| C. | inlet valve |
| D. | Pump |
| E. | gauge lines |
| Answer» D. Pump | |
| 145. |
As per IS specifications the endurance test for engines is conducted for |
| A. | 500 hours |
| B. | 1000 hours |
| C. | 100 hours |
| D. | 300 hours |
| E. | 200 hours |
| Answer» A. 500 hours | |
| 146. |
In a pumping installation the suction line is is 4 metre long and suction pipe diameter is 100 mm. Now if the suction pipe is replaced by a pipe combination consisting of 2 metres of 100 mm diameter pipe joined with 2 metres of 150 mm diameter pipe, the suction heat will become |
| A. | 6 metres |
| B. | 4 metres |
| C. | 2 metres |
| D. | 1 metre |
| E. | None of the above |
| Answer» B. 4 metres | |
| 147. |
Standard air is air at |
| A. | Atmospheric conditions at any specific location |
| B. | 1 kg/cm2 and atmospheric temperature (Relative humidity of 64%) |
| C. | 1 kg/cm2 and 20?C (Relative humidity of 36%) |
| D. | 1 kg/cm2 and 0?C (Relative humidity of 36%) |
| E. | None of the above |
| Answer» A. Atmospheric conditions at any specific location | |
| 148. |
Which of the following is not needed in case of magneto ignition? |
| A. | Coil |
| B. | Capacitor |
| C. | Distributor |
| D. | Battery |
| E. | Spark plug |
| Answer» D. Battery | |
| 149. |
During detonation in a petrol engine |
| A. | The rate of speed variation is high |
| B. | The rate of exhaust discharge is high |
| C. | The rate of temperature rise is high |
| D. | The rate of pressure rise is high |
| E. | None of the above |
| Answer» D. The rate of pressure rise is high | |
| 150. |
Volume of air at 27?C is 2 cu-m. What will be the volume at 327?C |
| A. | 3 cm-m |
| B. | 12 cm-m |
| C. | 4 cu-m |
| D. | 2 cu-m |
| E. | 8 cu-m |
| Answer» C. 4 cu-m | |
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