Mechanical Technology Mid - II, November - 2014

1.In a four stroke engine, the working cycle is completed in
  • one revolution of the crankshaft
  • two revolutions of the crankshaft
  • three revolutions of the crankshaft
  • four revolutions of the crankshaft
Answer: B
2.Which of the following does not relate to a spark ignition engine ?
  • Ignition coil
  • Spark plug
  • Distributor
  • Fuel Injector
Answer: D
3.If a petrol is used in a diesel engine, then
  • low power will be produced
  • efficiency will be low
  • higher knocking will occur
  • black smoke will be produced
Answer: C
4.The ratio of the indicated power to the brake power of the motor or engine required to drive the compressor, is called
  • compressor efficiency
  • volumetric efficiency
  • Isentropic efficiency
  • mechanical efficiency
Answer: D
5.The inter-cooling in muti-stage compressors is done
  • to cool the air during compression
  • to cool the air at delivery
  • to enable compression in two stages
  • to minimise the work of compression
Answer: D
6.If the flow of air through the compressor is perpendicular to its axis,then it is a
  • reciprocating compressor
  • centrifugal compressor
  • axial flow compressor
  • turbo compressor
Answer: B
7.The type of gears used to connect two non-parallel non-intersecting shafts are
  • spur gears
  • helical gears
  • spiral gears
  • none of these
Answer: C
8.The module is the reciprocal of
  • diametral pitch
  • circular pitch
  • pitch diameter
  • none of these
Answer: A
9.In a simple gear train, if the number of idle gears is odd, then the motion of driven gear will
  • be same as that of driving gear
  • be opposite as that of driving gear
  • depend upon the number of teeth on the driving gear
  • none of the above
Answer: A
10.A differential gear in an automobile is a
  • simple gear train
  • compound gear train
  • epicyclic gear train
  • none of these
Answer: C
11.When the axes of first and last gear are co-axial , then gear train is known as...........................
Answer: reverted gear train
12.In a gear train, when the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, is called..........................
Answer: epicyclic gear train
13.The volume of air delivered by the compressor is called.............................
Answer: compressor capacity
14.The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as .....................................of the compressor.
Answer: volumetric efficiency
15.The pressure of air at the beginning of the compression stroke is .......................atmospheric pressure.
Answer: less than
16.The thermal efficiency of a two stroke cycle engine is .....................of a four stroke cycle engine.
Answer: less than
17.The thermodynamic cycle on which the petrol engine works is ...............................
Answer: otto cycle
18.A petrol engine has compression ratio from ...............to..............
Answer: 6 to 10
19.The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is called................................
Answer: spur gearing
20.The radial distance of a tooth from the pitch circle to the bottom of the tooth, is called.........................
Answer: dedendum