Chapter 5 · MCQ Read Mode

Automobile Engines and Electric Vehicles

In the air-standard cycle, the specific heats of the working fluid are assumed to be:

Which effect is considered in the fuel-air cycle but NOT in the air-standard cycle?

The effect of variation of specific heats with temperature is to:

Dissociation in an IC engine:

The efficiency of the fuel-air cycle increases when the mixture is made:

Maximum power in an SI engine is obtained with a mixture that is:

Residual gases in the cylinder are:

The products of combustion of a rich mixture contain:

Time loss in the actual cycle arises because:

Opening the exhaust valve before BDC causes:

The correct order of efficiency for the same compression ratio is:

Pumping loss in an SI engine is largest at:

An engine with bore 80 mm and stroke 70 mm is described as:

The mean piston speed of an engine with 90 mm stroke running at 4000 rpm is:

Pistons of modern automobile engines are generally made of:

Cylinder liners are commonly manufactured by:

A wet liner is one that:

Connecting rods are usually manufactured by:

Sodium-filled hollow stems are used in:

A cast crankshaft is commonly made of:

Compared with a four-stroke engine, a two-stroke engine of the same size:

The most efficient scavenging method in two-stroke engines is:

An engine whose valves are both located in the cylinder head is a/an:

Highly stressed engine parts are forged rather than cast mainly because forging:

The firing interval of a four-stroke, six-cylinder engine is:

The firing interval of a four-stroke, four-cylinder engine is:

A single-cylinder engine requires a heavier flywheel than a multi-cylinder engine of the same power because:

The most common firing order of a four-cylinder in-line engine is:

A common firing order for an in-line six-cylinder engine is:

Adjacent cylinders are generally not fired consecutively in order to:

A horizontally opposed (boxer) engine is favoured in some cars because of its:

In an in-line four-cylinder engine, the forces that remain unbalanced are the:

Lanchester balance shafts rotate at:

The engine arrangement that is inherently balanced for primary and secondary forces and couples is the:

Secondary unbalanced forces in a reciprocating engine vary at:

A harmonic balancer on the crankshaft nose is used to reduce:

An engine with both valves located in the cylinder block beside the cylinder is a/an:

In a DOHC engine:

A main advantage of four valves per cylinder is:

Long intake runners in a tuned intake manifold mainly improve:

The inlet valve is usually made larger than the exhaust valve because:

Sodium is used inside hollow exhaust valve stems to:

The camshaft of a four-stroke engine rotates at:

Valve spring surge is prevented by using:

Tappet clearance for the exhaust valve is usually:

Insufficient valve (tappet) clearance can lead to:

Hydraulic tappets are used because they:

In the valve timing diagram of a four-stroke engine, the inlet valve:

Valve overlap refers to the period when:

A vehicle powered only by a rechargeable battery and electric motor, with no IC engine, is a:

A hybrid vehicle whose battery can also be charged from the electric grid is a:

In a series hybrid vehicle, the IC engine:

The Toyota Prius power-split hybrid uses a:

In an EV, the device that converts DC from the battery into variable-frequency three-phase AC for the motor is the:

The DC-DC converter in an EV is used to:

Estimating state of charge and balancing individual cells is a function of the:

High-voltage cables in electric vehicles are identified by the colour:

The purpose of the pre-charge resistor in the HV circuit is to:

During AC charging, the charging power is usually limited by the:

DC fast charging is faster than AC charging mainly because:

The seven-pin AC connector standard used in Europe and widely in India/Nepal is:

The Japanese DC fast-charging standard that supports bidirectional (V2G) charging is:

GB/T charging connectors are the national standard of:

Low heat rejection engines use coatings of:

A major drawback of low heat rejection engines is:

In an HCCI engine, ignition occurs by:

The main advantage of HCCI combustion is:

The main difficulty in HCCI engines is:

The rotor of a Wankel engine is:

In a Wankel engine, the output (eccentric) shaft turns how many times per rotor revolution?

A well-known problem of the Wankel rotary engine is:

In the Crower six-stroke engine, the fifth stroke is powered by:

Engine downsizing means:

Cylinder deactivation improves fuel economy at light load mainly by:

Mazda's SPCCI (Skyactiv-X) technology is related to: