HORTICULTURE

Detailed explanation-1: -How many times the intake valve opens in 4 stroke cycle engines running at 2000 rpm? Ans. 1000 times.

Detailed explanation-2: -During one cycle, the piston makes two round trips and the crankshaft revolves twice. The inlet and exhaust valves open and close only once. The ignition plug also sparks only once. A petrol engine, whether four-or two-stroke, is called a spark ignition (SI) engine because it fires with an ignition plug.

Detailed explanation-3: -Explanation: For every two revolutions one cylse is completed in a four stroke engine. If speed is 2000 rpm then number of complete cycles per minute is 1000. 14.

Detailed explanation-4: -In the theoretical 4-stroke process (Figure 4), the exhaust valve opens fully at the start of the exhaust stroke and closes fully at the end of the exhaust stroke. Similarly, the intake valve opens at the start and closes at the end of the intake stroke.

Detailed explanation-5: -There are two strokes per revolution, so at 1000 RPM you will have 2000 strokes per minute. Given that it’s a four-stroke engine, 1 in 4 of those will be power strokes for each given piston.