Explore topic-wise MCQs in ENGINEERING SERVICES EXAMINATION (ESE).

This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.

1.

 In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner? 

A. Impulse turbine
B. Reaction turbine
C. Both a. and b
D. None of the above
Answer» B. Reaction turbine
2.

 The pressure of water is atmospheric and remains constant while passing over the runner in __________ . 

A. Impulse turbine
B. Reaction turbine
C. Both a. and b.
D. None of the above
Answer» B. Reaction turbine
3.

 The energy of water entering the reaction turbine is _______ 

A. fully the kinetic energy
B. fully the pressure energy
C. partly the pressure energy and partly the kinetic energy
D. unpredictable
Answer» D. unpredictable
4.

Which of the following is an example of impulse turbine? 

A. Propeller turbine
B. Francis turbine
C. Kaplan turbine
D. Pelton wheel
Answer» E.
5.

 The runner of __________ turbine always be under pressure of above atmospheric 

A. Turgo
B. Girand
C. Kaplan
D. None of the above
Answer» D. None of the above
6.

The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area. 

A. constant
B. gradually decreasing
C. gradually increasing
D. uneven
Answer» D. uneven
7.

_________ turbines are also called as parallel flow turbine. 

A. Radial flow
B. Axial flow
C. Both radial flow and axial flow
D. None of the above
Answer» C. Both radial flow and axial flow
8.

 In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?

A. Radial flow turbine
B. Axial flow turbine
C. Mixed flow turbine
D. All of the above
Answer» D. All of the above
9.

 Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.

A. lower than
B. higher than
C. same as
D. unpredictable
Answer» C. same as
10.

The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________ 

A. steam turbine
B. steam nozzle
C. steam area
D. all of the above
Answer» C. steam area
11.

 The nozzle efficiency can be defined as the ratio of 

A. isentropic enthalpy drop to actual enthalpy drop
B. actual enthalpy drop to isentropic enthalpy drop
C. isothermal enthalpy drop to isentropic enthalpy drop
D. isentropic enthalpy drop to isothermal enthalpy drop
Answer» D. isentropic enthalpy drop to isothermal enthalpy drop
12.

Which of the following are effects of nozzle friction?

1. Enthalpy drop decreases
2. Exit velocity reduces
3. Decrease in specific volume
4. Decrease in mass flow rate 

A. (1), (2) and (3)
B. (2), (3) and (4)
C. (1), (3) and (4)
D. (1), (2) and (4)
Answer» E.
13.

The quality of vapour at the exit of nozzle ___________ due to nozzle friction.

A. increases
B. decreases
C. does not change
D. unpredictable
Answer» B. decreases
14.

 Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid. 

A. pressure energy
B. kinetic energy
C. either pressure energy or kinetic energy
D. pressure energy, kinetic energy or both
Answer» E.
15.

Which of the following is NOT a type of positive displacement pumps?

A. Reciprocating pump
B. Rotary displacement pump
C. Centrifugal pump
D. None of the above
Answer» D. None of the above
16.

Rotary displacement pumps are suitable for handling ________. 

A. oils
B. gritty liquids
C. both oils as well as gritty liquids
D. None of the above
Answer» B. gritty liquids
17.

Which of the following is/are example/s of rotary displacement pumps? 

A. Gear pump
B. Vane pump
C. Rotary piston pump
D. All of the above
Answer» E.
18.

___________ pump is also called as velocity pump. 

A. Reciprocating
B. Rotary displacement
C. Centrifugal
D. Screw
Answer» D. Screw
19.

The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor.

A. lower than
B. higher than
C. same as
D. unpredictable
Answer» C. same as
20.

 Which of the following is NOT a type of rotary compressor?

A. Positive displacement type of compressor
B. Steady flow compressor
C. Both a. and b.
D. None of the above
Answer» E.
21.

 The function of _________ is to convert high kinetic energy of gases into pressure energy.

A. impeller
B. diffuser
C. casing
D. None of the above
Answer» C. casing
22.

How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor? 

A. Air velocity goes no increasing in impeller followed by diffuser
B. Air velocity goes no decreasing in impeller followed by diffuser
C. Air velocity increases in impeller and then decreases in diffuser
D. Air velocity decreases in impeller and then increases in diffuser
Answer» D. Air velocity decreases in impeller and then increases in diffuser
23.

 A pair of fixed blade and rotor blade in axial flow compressor is called as _________. 

A. step
B. pair
C. stage
D. state
Answer» D. state
24.

An axial flow compressors have _______. 

A. a drum type rotor
B. a disc type rotor
C. a drum type rotor or a disc type rotor
D. none of the above
Answer» D. none of the above
25.

 ________ blades are attached to the rotor or spindle.

A. Fixed
B. Moving
C. Both fixed and moving
D. None of the above
Answer» C. Both fixed and moving
26.

The blade passages in a compressor are ________ 

A. converging
B. diverging
C. constant
D. unpredictable
Answer» C. constant
27.

 What is the head of water available at turbine inlet in hydro-electric power plant called?

A. head race
B. tail race
C. gross head
D. net head
Answer» E.
28.

What is runaway speed of the runner of Pelton wheel? 

A. maximum unsafe speed of the runner due to sudden increase in load on turbine
B. minimum safe speed of the runner due to sudden increase in load on turbine
C. maximum unsafe speed of the runner due to sudden decrease in load on turbine
D. minimum safe speed of the runner due to sudden decrease in load on turbine
Answer» D. minimum safe speed of the runner due to sudden decrease in load on turbine
29.

The gates of aerofoil section in between the outer and inner ring of guide wheel are called as ________.

A. guide gates
B. guide vanes
C. scrolling gates
D. scrolling vanes
Answer» C. scrolling gates
30.

Which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race? 

A. Scroll casing
B. Guide vanes
C. Moving vanes
D. Draft tube
Answer» E.
31.

 As the reaction turbine works on the principle of impulse and reaction, it follows the law of ________. 

A. impulse momentum
B. angular momentum
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
32.

In which type of turbine, the runner needs to be run full of water? 

A. Impulse turbine
B. Reaction turbine
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
33.

 In reaction turbine work is done_______________. 

A. totally due to change in kinetic energy of jet
B. totally due to change in pressure head
C. mostly due to change in pressure head and small amount of work is due to change in kinetic energy
D. mostly due to change in kinetic energy and small amount of work is due to change in pressure head
Answer» D. mostly due to change in kinetic energy and small amount of work is due to change in pressure head
34.

 The ratio of actual mass flow rate (ṁa) to ideal mass flow rate (ṁi) is called as________ 

A. nozzle coefficient
B. coefficient of nozzle friction
C. coefficient of discharge
D. coefficient of mass
Answer» D. coefficient of mass
35.

Which of the following sentences are correct for steam turbine?

1. Steam turbine requires large floor area
2. Steam turbine is a rotary high speed machine
3. Steam turbine has low weight to power ratio
4. Steam turbine has more initial cost and maintenance cost 

A. (1) and (2)
B. (2) and (3)
C. (3) and (4)
D. (1) and (4)
Answer» C. (3) and (4)
36.

 The blade speed ratio of impulse turbine is given as ___________ 

A. (Blade velocity) / (Steam velocity at inlet)
B. (Blade velocity) / (Steam velocity at exit)
C. (Steam velocity at inlet) / (Blade velocity)
D. (Steam velocity at exit) / (Blade velocity)
Answer» B. (Blade velocity) / (Steam velocity at exit)
37.

 Discharge capacity of the reciprocating pump is __________ that of the centrifugal pump. 

A. higher than
B. lower than
C. same as
D. unpredictable
Answer» C. same as
38.

 Which pump is more suitable for an application where very high pressure is required to be developed at moderate discharge? 

A. Reciprocating pump
B. Centrifugal pump
C. Turbine
D. None of the above
Answer» B. Centrifugal pump
39.

The process of filling the liquid into the suction pipe and pump casing upto the level of delivery valve is called as _________. 

A. filling
B. pumping
C. priming
D. leveling
Answer» D. leveling
40.

The volute pumps and vortex volute pumps are __________ pumps with _________ shaft. 

A. multistage, horizontal
B. multistage, vertical
C. single stage, horizontal
D. single stage, vertical
Answer» D. single stage, vertical
41.

Which of the following centrifugal pumps has higher specific speed than the others? 

A. Axial flow
B. Radial flow
C. Mixed flow
D. All have same specific speed
Answer» B. Radial flow
42.

 Angular momentum of gas in the free vortex of vaneless diffuser ___________. 

A. increases
B. decreases
C. remains constant
D. becomes unpredictable
Answer» D. becomes unpredictable
43.

 Vaneless diffusers are suitable for ___________. 

A. only low pressure rise
B. only high pressure rise
C. both low as well as high pressure rise
Answer» B. only high pressure rise
44.

The diffuser blades are kept ______ the number of impeller blades . 

A. 1/10 th of
B. 1/3 rd of
C. 10 times
D. 3 times
Answer» C. 10 times
45.

The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________. 

A. velocity factor
B. slip factor
C. work factor
D. none of the above
Answer» C. work factor
46.

What is the ratio of isentropic work to Euler work in an centrifugal compressor called? 

A. Work coefficient
B. Velocity coefficient
C. Pressure coefficient
D. Flow coefficient
Answer» C. Pressure coefficient
47.

 ___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor. 

A. Degree of pressure
B. Degree of reaction
C. Pressure ratio
D. Reaction ratio
Answer» C. Pressure ratio
48.

What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called? 

A. Work input factor
B. Workdone factor
C. Both a. and b.
D. None of the above
Answer» D. None of the above
49.

What is the effect of increasing number of stages in axial flow compressor on the mean work input factor (Ψw)?

A. Mean work input factor (Ψw) decreases
B. Mean work input factor (Ψw) increases
C. Mean work input factor (Ψw) remains constant
D. Unpredictable
Answer» B. Mean work input factor (Ψw) increases
50.

   What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)? 

A. Blade loading coefficient (Ψ) increases
B. Blade loading coefficient (Ψ) decreases
C. Blade loading coefficient (Ψ) remains constant
D. Unpredictable
Answer» C. Blade loading coefficient (Ψ) remains constant