MCQOPTIONS

Explore topic-wise MCQs in Thermal Engineering.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.	Determine the value of cutoff ratio if compression ratio and expansion ratio is equal to 15 and 11 respectively.
A.	1.4
B.	1.36
C.	1.5
D.	1.3
Answer» C. 1.5

2.	Determine the value of expansion ratio if compression ratio and cutoff ratio is equal to 15 and 1.4 respectively.
A.	10.5
B.	21
C.	11
D.	10.7
Answer» E.

3.	What is the relation between compression ratio, cutoff ratio and expansion ratio?
A.	r<sub>e</sub> = r
B.	r<sub>e</sub> = /r
C.	r<sub>e</sub> = 1/ r
D.	r<sub>e</sub> = r/
Answer» E.

4.	What is the efficiency of dual cycle if compression ratio and cut-off ratio is equal to 13 and 1.4 respectively?
A.	68%
B.	63%
C.	60%
D.	65%
Answer» C. 60%

5.	The cut-off ratio ( ) of dual cycle is equal to ________
A.	Volume at which fuel supply cutoff to volume at which fuel supply start
B.	Volume at which fuel supply throughout the process to volume at which fuel supply cutoff
C.	Volume at which fuel supply cutoff to volume of fuel supply throughout the process
D.	Volume at which fuel supply start to volume at which fuel supply cutoff
Answer» B. Volume at which fuel supply throughout the process to volume at which fuel supply cutoff

6.	The compression ratio (r) of dual cycle is equal to ________
A.	r = volume of the cylinder at the beginning of the compression/volume of the cylinder at the end of the compression
B.	r = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression
C.	r = clearance volume/ volume of the cylinder at the beginning of the compression
D.	r = volume of the cylinder at the end of the compression/clearance volume
Answer» B. r = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression

7.	What is the value of working fluid in dual cycle?
A.	1.0
B.	1.2
C.	1.4
D.	1.8
Answer» D. 1.8

8.	What is the efficiency of dual cycle if compression ratio and cut-off ratio is equal to 15 and 1.4 respectively?
A.	91%
B.	90.8%
C.	90.6%
D.	90%
Answer» E.

9.	Most high speed compression ignition operates on ________
A.	Diesel cycle
B.	Otto cycle
C.	Brayton cycle
D.	Dual cycle
Answer» E.

10.	In a dual cycle heat addition takes place ________
A.	At constant volume process
B.	At constant pressure process
C.	First at constant volume then at constant pressure process
D.	First at constant pressure then at constant volume process
Answer» D. First at constant pressure then at constant volume process

11.	In a dual cycle heat rejection takes place ______
A.	At constant volume process
B.	At constant pressure process
C.	First at constant volume then at constant pressure process
D.	First at constant pressure then at constant volume process
Answer» B. At constant pressure process

12.	Dual cycle consist of __________
A.	Two constant pressure and two adiabatic process
B.	Two constant volume and two adiabatic process
C.	One constant pressure process, two constant volume process and two adiabatic process
D.	One constant pressure process, one constant volume process and two adiabatic process
Answer» D. One constant pressure process, one constant volume process and two adiabatic process

13.	What is the efficiency of dual cycle?
A.	1- ( frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} )
B.	1- ( frac{1}{r^{ -1}} frac{( ^ r_p-1)}{(r_p-1)+ r_p} )
C.	1- ( frac{1}{r^ } frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} )
D.	1- ( frac{1}{r^{ -1}} frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} )
Answer» E.

14.	Dual cycle is combination of__________
A.	Stirling and diesel cycle
B.	Otto and diesel cycle
C.	Stirling and otto cycle
D.	Otto and Brayton cycle
Answer» C. Stirling and otto cycle

15.	What is the other name of dual cycle?
A.	Mixed cycle
B.	Otto cycle
C.	Diesel cycle
D.	Joule Cycle
Answer» B. Otto cycle