Test: Gas Power Cycles - 2 - Mechanical Engineering MCQ

The engines which are operating on gas power cycle are 

Which one of the following changes/sets of changes in the source and sink temperatures (T₁ and T₂ respectively) of a reversible engine will result in the maximum improvement in efficiency?

What does the reversed ideal Stirling cycle consist of?

Which one of the following parameters is significant to ascertain chemicalequilibrium of a system?

For maximum specific output of a constant volume cycle (Otto cycle)

For the same maximum pressure and heat input, the most efficient cycle is 

Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.

Reason (R): In a four stroke engine one cycle is completed in two revolutions.

Match List I with II and select the correct answer using the code given below the
Lists:

List I                                                     List II
(Prime Mover)                                   (Air Standard Cycle)
A. High Speed diesel engine             1. Atkinson Cycle
B. IC engine having expansion          2. Dual combustion limited pressure ratio greater than compression Praagtieo  of cycle 
C. Pulse jet engine                             3. Erickson Cycle
D. Gas turbine with multistage           4. Lenoir cycle compression and multistage expansion

Match List-I with List-II and select the correct answer using the codes given below the lists:

Assertion (A): In practice, the efficiency of diesel engines is higher than that of petrolengines.
Reason (R): For the same compression ratio, the efficiency of diesel cycle is higherthan that of Otto cycle.

Match List I (Cycles) with List II (Processes) and select the correct answer using the codes given below the Lists:

A gas turbine cycle with infinitely large number of stages during compressionand expansion approaches

In the case of a Diesel cycle, increasing the cut-off ratio will increase

Assertion (A): For a given compression ratio, the thermal efficiency of the Diesel cycle will be higher than that of the Otto cycle.
Reason(R): In the Diesel cycle, work is also delivered during heat addition.

The air standard efficiency of diesel cycle will be less than that of Otto cyclein the case of

Match List I with List II and select the correct answer using the codes given below the lists:

For the same compression ratio and the same heat input, the correctsequence of the increasing order of the thermal efficiencies of the givencycles is

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because, in Otto cycle

The correct sequence of the given four cycles on T-s plane in Figure (1), (2),(3), (4) is

Which one of the following hypothetical heat engine cycle represents maximum efficiency?

The correct sequence of the cycles given in the above T-S diagrams is

 Stirling and Ericsson cycles are

In an air standard Otto cycle, r is the volume compression ratio and y is an adiabatic index (C_p/ C_v), the air standard p v efficiency is given by

Which one of the following p-T diagrams illustrates the Otto cycle of an ideal gas?

Thermodynamic cycle shown above on the temperature – entropy diagrampertains to which one of the following?

A cyclic heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%, the heat rejected per cycle is 

A solar energy based heat engine which receives 80 kJ of heat at 100 deg Cand rejects 70 kJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine is