McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
Morse Test in multicylinders is used to determine |
| A. | Air flow to engine |
| B. | Mechanical efficiency |
| C. | Volumetric efficiency |
| D. | BHP |
| E. | IHP |
| Answer» B. Mechanical efficiency | |
| 102. |
In case of tractors the springs provided on rear wheel are |
| A. | No spring is provided |
| B. | Helical |
| C. | Depend on the design |
| D. | ombination of helical and leaft spring |
| E. | Leaf type |
| Answer» A. No spring is provided | |
| 103. |
Which one of the following is the trouble due to clutch? |
| A. | Dragging |
| B. | Rattling |
| C. | Slipping |
| D. | Grabbing |
| E. | All of the above |
| Answer» E. All of the above | |
| 104. |
Diesel fuel in a cylinder of CL engine will ignite when temperature of compressed air is |
| A. | 1000°C |
| B. | 1200°C |
| C. | 1500°C |
| D. | 2000°C |
| E. | None of the above |
| Answer» A. 1000°C | |
| 105. |
The function of condenser in the ignition circuit of an SI engine is |
| A. | to interrupt the battery current |
| B. | to enhance the circuit voltage |
| C. | to avoid arcing at the contact breaker and to cause faster decay of primary current |
| D. | none of the above |
| E. | None of the above |
| Answer» C. to avoid arcing at the contact breaker and to cause faster decay of primary current | |
| 106. |
Which of the following vehicle does not have battery? |
| A. | Ambassador car |
| B. | Maruti car |
| C. | Vespa scooter |
| D. | Tata truck |
| E. | None of the above |
| Answer» C. Vespa scooter | |
| 107. |
The device in the cooling system that increses the boiling point of the water in the system is called |
| A. | Drain plug |
| B. | Pressure cap |
| C. | Radiator |
| D. | Water jacket |
| E. | Vacuum valve |
| Answer» B. Pressure cap | |
| 108. |
In a diesel engine a clogged nozzle could result in |
| A. | Excessive fuel consumption |
| B. | Over-rich mixture |
| C. | Excessive smoke |
| D. | Failure to start |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 109. |
For a spark plug M 14 x 1.25 the last figure 1.25 stands for |
| A. | Gap between electrodes in mm |
| B. | Pitch of plug thread |
| C. | Electrode diameter in mm |
| D. | Tip width in mm |
| E. | Size of plug thread |
| Answer» B. Pitch of plug thread | |
| 110. |
The knocking in S.I. engines is characterised by sudden auto-ignition of the change |
| A. | nearest to the spark plug |
| B. | farthest away from the spark plug |
| C. | in the middle from the spark plug |
| D. | none of the above |
| E. | None of the above |
| Answer» B. farthest away from the spark plug | |
| 111. |
Ignition coil is used to |
| A. | Step down voltage |
| B. | Step up power |
| C. | Step down current |
| D. | Step up voltage |
| E. | Step up current |
| Answer» D. Step up voltage | |
| 112. |
Radiator tubes are generally made of |
| A. | Brass |
| B. | Steel |
| C. | Plastics |
| D. | Rubber |
| E. | Cast iron |
| Answer» A. Brass | |
| 113. |
Increasing the temperature of intake air in an I.C. engine will |
| A. | increase the efficiency |
| B. | decrease the efficiency |
| C. | increase or decrease the efficiency |
| D. | None of the above |
| E. | Low ambient temperature |
| Answer» B. decrease the efficiency | |
| 114. |
The Diesel fuel pump is designed to supply fuel |
| A. | At constant quantity at all engine speeds |
| B. | In excess quantity than required by the injection pump |
| C. | Just sufficient against the demand of the injection pump |
| D. | In sufficient quantity in accordance with the engine speed |
| E. | In less quantity than required by the injection pump |
| Answer» D. In sufficient quantity in accordance with the engine speed | |
| 115. |
The phenomenon by which a fuel catches fire without external flame is known as |
| A. | pre-ignition |
| B. | detonation |
| C. | ignition lag |
| D. | auto-ignition |
| E. | None of the above |
| Answer» D. auto-ignition | |
| 116. |
Air resistance to a car at 20 kmph is R. The air resistance at 40 kmph would be |
| A. | 4R2 |
| B. | 2 R |
| C. | R2 |
| D. | R |
| E. | 4 R |
| Answer» C. R2 | |
| 117. |
The knocking in C.I. engine can be prevented if the first element of the fuel and air is having |
| A. | low density |
| B. | medium density |
| C. | high density |
| D. | none of the above |
| E. | None of the above |
| Answer» C. high density | |
| 118. |
Exhaust gas leakage into the cooling system is most likely be due to defective |
| A. | Cylinder head gasket |
| B. | Manifold gasket |
| C. | Water pump |
| D. | Radiator |
| E. | Any of the above |
| Answer» A. Cylinder head gasket | |
| 119. |
The value overlap in case of four stroke petrol engine is approximately |
| A. | 30? |
| B. | 60? |
| C. | 90? |
| D. | 120? |
| E. | None of the above |
| Answer» A. 30? | |
| 120. |
Driving wheel hearings in automobiles are always |
| A. | Bush bearing |
| B. | Clad metal bearings |
| C. | Anti-friction bearings |
| D. | Either (A) or (B) |
| E. | Either (B) or (C) |
| Answer» C. Anti-friction bearings | |
| 121. |
The level of electroyte in automobiles battery should be |
| A. | Exactly at the level of the plates |
| B. | 15 mm below the top of plates |
| C. | 5 - 10 mm below the top of plates |
| D. | Upto the maximum permissible level |
| E. | 10 - 15 mm above top of plates |
| Answer» E. 10 - 15 mm above top of plates | |
| 122. |
The exhaust value remains open approximately for |
| A. | 160? |
| B. | 180? |
| C. | 190? |
| D. | 235? |
| E. | None of the above |
| Answer» D. 235? | |
| 123. |
As the number of cylinders on multi-cylinder engines increases the power to weight ratio |
| A. | Has nothing to do with number of cylinders |
| B. | Decreases |
| C. | Increases |
| D. | Remains the same |
| E. | Becomes zero |
| Answer» B. Decreases | |
| 124. |
Which of the following part is not needed on spark ignition engines using magneto ignition? |
| A. | Battery |
| B. | Spark plug |
| C. | Distributor |
| D. | Induction coil |
| E. | None of the above |
| Answer» A. Battery | |
| 125. |
Aluminium cylinder blocks require |
| A. | No liners |
| B. | Aluminium liners |
| C. | Surface hardening |
| D. | Cast iron liners |
| E. | Mild steel liners |
| Answer» D. Cast iron liners | |
| 126. |
In case of Diesel engines into the engine cylinder during suction stroke |
| A. | air and fuel is drawn |
| B. | only fuel is drawn |
| C. | only air is drawn |
| D. | none of the above |
| E. | None of the above |
| Answer» C. only air is drawn | |
| 127. |
Too early ingition in SI engine will cause |
| A. | pinking, power loss |
| B. | hotter running, power loss |
| C. | power loss, higher fuel consumption |
| D. | none of the above |
| E. | None of the above |
| Answer» A. pinking, power loss | |
| 128. |
Castor is |
| A. | forward tilt of the king pin |
| B. | backward tilt of the king pin |
| C. | either of (A) and (B) above |
| D. | none of the above |
| E. | None of the above |
| Answer» C. either of (A) and (B) above | |
| 129. |
Ignition advance is expressed in terms of |
| A. | Crank angle |
| B. | Millimetres of piston travel before TDC |
| C. | Time in milliseconds |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 130. |
The most popular firing order in case of cylinder in-line IC engine is |
| A. | 1-2-3-4 |
| B. | Alcohol |
| C. | 1-4-2-3 |
| D. | 4-3-2-1 |
| E. | 1-3-4-2 |
| Answer» E. 1-3-4-2 | |
| 131. |
The quantity of oil delivered by injection pump in diesel engine is controlled by |
| A. | upward movement of control helix |
| B. | downward movement of control helix |
| C. | rotation of control helix |
| D. | none of the above |
| E. | None of the above |
| Answer» C. rotation of control helix | |
| 132. |
As a rule, before the pistons are removed it is necessary to remove the |
| A. | Piston rings |
| B. | Circlip |
| C. | Camshaft |
| D. | Crankshaft |
| E. | Gudgeon pin |
| Answer» A. Piston rings | |
| 133. |
Deposit of carbon in the exhaust system |
| A. | Will have no effect on back pressure |
| B. | Will reduce back pressure |
| C. | Will increase back pressure |
| D. | Will result in black smoke |
| E. | Will increase noise level |
| Answer» C. Will increase back pressure | |
| 134. |
In case of a Petrol engine, the spark plug should produce the spark |
| A. | exactly at the end of compression stroke |
| B. | slightly before the end of compression stroke |
| C. | slightly after the end of exhaust stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» B. slightly before the end of compression stroke | |
| 135. |
In four cylinder engines the ignition advance depends on |
| A. | Quality of fuel |
| B. | Engine speed |
| C. | Cylinder dimensions |
| D. | (A) and (B) only |
| E. | (A), (B) and (C) together |
| Answer» D. (A) and (B) only | |
| 136. |
In an automobile engine the temperature of the piston will be more at |
| A. | The piston walls |
| B. | The skirt of the piston |
| C. | The piston rings |
| D. | The piston pin |
| E. | The crown of the piston |
| Answer» E. The crown of the piston | |
| 137. |
If a lead acid battery is fully charged at specific gravity of 1.28 and fully discharged at specific gravity of 1.11 then at specific gravity of 1.19, the battery will be |
| A. | nearly fully charged |
| B. | more than 50% charged |
| C. | 50% charged |
| D. | less than 50% charged |
| E. | None of the above |
| Answer» D. less than 50% charged | |
| 138. |
Generally speaking for better efficiency of IC engine the valves must |
| A. | open before the beginning of a stroke and close before the end of a stroke |
| B. | open after the beginning of a stroke and close before the end of a stroke |
| C. | open after the beginning of a stroke and close after the end of a stroke |
| D. | open before the beginning of a stroke and close after the end of a stroke |
| E. | None of the above |
| Answer» D. open before the beginning of a stroke and close after the end of a stroke | |
| 139. |
The inlet value remains open approximately for |
| A. | 160? |
| B. | 180? |
| C. | 190? |
| D. | 235? |
| E. | None of the above |
| Answer» D. 235? | |
| 140. |
Maximum danger of ol dilution by fuel in an engine occurs when |
| A. | Engine is running at overload |
| B. | Engine is running at rated load |
| C. | Engine is running on lean mixture |
| D. | Choke circuit is cut in for too long a period |
| E. | All of the above |
| Answer» D. Choke circuit is cut in for too long a period | |
| 141. |
In the fuel injection pumps for Diesel engine the effective pressure strokes of the plungers in the fuel injection pump are regulated by means of a |
| A. | Camshaft |
| B. | Check valve |
| C. | Needle valve |
| D. | Control rack |
| E. | Fuel pump |
| Answer» D. Control rack | |
| 142. |
A laminated glass upon cracking |
| A. | Bursts into sharp edged fragments |
| B. | Bursts into granular pieces |
| C. | Sandwitched layer traps the fragments |
| D. | Breaks into the form of crystals |
| E. | None of the above |
| Answer» C. Sandwitched layer traps the fragments | |
| 143. |
In an internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is |
| A. | 75% |
| B. | 10% |
| C. | 5% |
| D. | 30% |
| E. | 60% |
| Answer» D. 30% | |
| 144. |
In case of oil bath type air cleaner, the oil sediments formed by the dust must be removed |
| A. | Monthly |
| B. | After about 500 km |
| C. | Weekly |
| D. | After about 5000 km |
| E. | Every day |
| Answer» D. After about 5000 km | |
| 145. |
Which one of the followings is used in S.I. engines? |
| A. | spark plug |
| B. | injector |
| C. | cross-head |
| D. | none of the above |
| E. | None of the above |
| Answer» A. spark plug | |
| 146. |
In a S.I. engine the intake valve closes |
| A. | 35? to 80? after BDC |
| B. | 25? to 80? before BDC |
| C. | At TdDC |
| D. | 10? to 20? before |
| E. | At BDC |
| Answer» A. 35? to 80? after BDC | |
| 147. |
In a Diesel engine the duration between the time of injection and the time of ignition is called |
| A. | Spil cut off |
| B. | Delay period |
| C. | Period of injection |
| D. | Period of ignition |
| E. | None of the above |
| Answer» B. Delay period | |
| 148. |
Poor compression in a two stroke engine cannot be due to |
| A. | Leaky valves |
| B. | Broken piston rings |
| C. | Leaking cylinder head gasket |
| D. | Poor fits between pistons, rings and cylinders |
| E. | Any of the above |
| Answer» A. Leaky valves | |
| 149. |
The angle between the cord and the centre line of the tread is called |
| A. | tread angle |
| B. | side wall angle |
| C. | crown angle |
| D. | none of the above |
| E. | None of the above |
| Answer» C. crown angle | |
| 150. |
A stratified charged engine provides |
| A. | air fuel mixture of different air-fuel ratios at various places on the combustion chamber |
| B. | different air fuel ratios in consecutive strokes |
| C. | different air fuel ratios at different times depending upon the load |
| D. | none of the above |
| E. | None of the above |
| Answer» A. air fuel mixture of different air-fuel ratios at various places on the combustion chamber | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.