Certificate In EV Charging Station /30 0 Your Examination is Complete ! Certificate In EV Charging StationOnline Examination Detail: Duration- 60 minutes. Number of Questions- 30. (Multiple Choice Questions). Maximum Marks- 100, Passing Marks- 40%. There is no negative marking. Candidate Details NameEmailPhone Number 1 / 301. In two-stroke cycle engines, what replaces valves of a four-stroke engine? A. Fins B. Notches C. Ports D. Tubes 2 / 302. Why is a thermistor used in an alternator regulator? A. To control maximum current B. To control maximum voltage C. To compensate for temperature change D. To control minimum current 3 / 303. In a four stroke ic engine, how many strokes are covered for one complete crankshaft revolution? A. 4 B. 2 C. 1 D. 0.5 4 / 304. A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step? A. Isentropic expansion B. Isentropic compression C. Isothermal expansion D. Isothermal compression 5 / 305. In a Otto cycle engine, combustion occurs at __________ A. Constant pressure B. Constant temperature C. Constant volume D. Constant heat 6 / 306. Which of these is a power absorbing heat engine? A. Steam engine B. Petrol engine C. Air compressor D. None of the mentioned 7 / 307. Which of the following is not an advantage of the alternator? A. Higher output B. Lower weight C. Less maintenance D. High efficiency 8 / 308. Which component in the DC generator produces a magnetic field? A. Stator B. Commutator C. Armature D. Carbon brushes 9 / 309. A gas undergoes isothermal compression in Carnot cycle. Which step does it undergo? A. 1st B. 2nd C. 3rd D. 4th 10 / 3010. Which of these is not an assumption made in deriving the formula for air standard of Otto cycle? A. There is no heat loss during the cycle B. The compression and expansion are isothermal C. The heating and cooling strictly take place at constant volume D. The suction and exhaust take place at atmospheric pressure 11 / 3011. A gas undergoes step 2 in Carnot cycle. Which of these processes describes the 2nd step? A. Isentropic expansion B. Isentropic compression C. Isothermal expansion D. Isothermal compression 12 / 3012. The efficiency of a combined cycle gas turbine(steam cooled) can range as high as ________ A. 20% B. 30% C. 40% D. 60% 13 / 3013. At the start of the engine, the charging voltage is _______ A. Lower B. Higher C. Same D. Zero 14 / 3014. Field coils in a generator produce permanent magnet. A. True B. False 15 / 3015. A heat engine converts heat energy from fuel combustion or any other source into which type of work? A. Electrical work B. Mechanical work C. Pressure work D. None of the mentioned 16 / 3016. What is the frequency of a vibrating contact type regulator for DC generator? A. 20 per second B. 200 per second C. 200 per minute D. 20 per minute 17 / 3017. The expansion process in diesel engine is ________ A. Isothermal B. Adiabatic C. Isobaric D. None of the mentioned 18 / 3018. The valves of an ic engine are made to open and close slowly to _________ A. Increase the engine efficiency B. Decrease the fuel consumption C. Allow engine to cool in the meantime D. Provide silent operation under high speed conditions 19 / 3019. Which component in alternator produces a magnetic field? A. Frame B. Stator C. Regulator D. Rotor 20 / 3020. If the lead-acid cell has a total of 17 cells, then what is the number of positive plates? A. 9 B. 8 C. 7 D. 6 21 / 3021. Which of these is a type of reciprocating steam engine? A. Simple B. Compound C. Uniflow D. All of the mentioned 22 / 3022. A steam engine comes under the category of ________ A. External combustion engines B. Internal combustion engines C. All of the mentioned D. None of the mentioned 23 / 3023. What is the material of an alternator frame? A. Cast iron B. Brass C. Copper D. Aluminum 24 / 3024. Higher efficiency in Otto cycle can be achieved by _______ A. Increasing the compression ratio B. Decreasing the compression ratio C. Keeping the compression ratio constant D. Efficiency does not depend on compression ratio 25 / 3025. In a Diesel cycle engine, combustion occurs at _________ A. Constant pressure B. Constant temperature C. Constant volume D. Constant heat 26 / 3026. One ‘ton of refrigeration’ equals how much Btu/hr. A. 14,500 Btu/hr B. 12,000 Btu/hr C. 13,000 Btu/hr D. 15,000 Btu/hr 27 / 3027. In a 4-stroke ic engine, which of the strokes is considered as working or power stroke? A. Suction stroke B. Compression stroke C. Expansion stroke D. Exhaust stroke 28 / 3028. In an alternator, which component controls the output? A. Voltage regulator B. Cutout relay C. Current regulator D. Diode 29 / 3029. Thermal power plants operate on which of these cycles? A. Otto cycle B. Rankine cycle C. Carnot cycle D. Stirling cycle 30 / 3030. Heat rejection in diesel cycle is at _________ A. Constant pressure B. Constant volume C. Constant temperature D. None of the mentioned Exit