Organisation : Jharkhand Public Service Commission
Recruitment Name : Assistant Engineer
Document Type : Previous Question Paper
Year : 2018-2019
Website : https://www.jpsc.gov.in/sam_question_paper.php
JPSC Assistant Engineer Previous Question Paper
1. In reciprocating air compressor the method of controlling the quantity of air delivered is done by
(A) Throttle control
(B) Blow-off control
(C) Clearance control
(D) All of`the above
Related / Similar Question Paper : Bihar Public Service Commission Question Paper School Teacher
2. Heat transfer takes place according to the following law of thermodynamics
(A) Zeroth
(B) First
(C) Second
(D) Third
3. Heat transfer in liquid and gases is essentially due to
(A) Conduction
(B) Convection
(C) Radiation
(D) Conduction and Radiation
4. Which mode(s) of heat transfer does (do) not need a mat6rial medium ?
(A) Conduction
(B) Convection
(C) Radiation
(D) Convection and Radiation
5. As the temperature increases, the thermal conductivity of a gas
(A) increases
(B) decreases
(C) remains constant
(D) increase upto a certain temperature and then decrease
6. Heat conduction in gases is due to
(A) motion of electrons
(B) elastic impact of molecules
(C) mixing motion of the different layers of the gas
(D) electromagnetic waves
7. Indicate the metal with highest thermal conductivity
(A) Steel
(B) Silver
(C) copper
(D) Aluminium
8. Identify the very good insulator
(A) Sawdust
(B) Glass wool
(C) Cork
(D) Asbestos sheet
9. Fins are provided on heat transforming surface in order to increase
(A) heat transfer area
(B) heat transfer coefficient
(C) temperature gradient
(D) mechanical strength equipment
10. Finned surfaces have improved rate of heat dissipation due to
(A) decrease in ambient temperature.
(B) increase in the surface area exposed to the surrounding.
(C) increase in the corrective film coefficient.
(D) All of the above
11. An increase in fin effectiveness is caused by high value of ,
(A) convective coefficient
(B) thermal conductivity
(C) Circumference
(D) a)and(c)
12. Transient conduction means
(A) very little heat transfer.
(B) heat transfer for a short time.
(C) heat transfer with a very small temperature difference.
(D) conduction when the temperature at a point varies with time.
13. In the lumped parameter model, the temperature variation with time is
(A) Linear
(B) cubic
(C) Exponential
(D) Sinusoidal
14. Heat transfer by Radiation is encountered least in
(A) Boiler furnace
(B) Insulated steam pipe
(C) Electric bulb
(D) Nuclear reactor
15. Absorptivity of a body is equal to its emissivity
(A) for a polished body
(B) under thermal equilibrium condition
(C) at one particular temperature
(D) at shorter wavelengths
16. The emissivity is likely to be higher in case of _
(A) Rubber
(B) Paper
(C) Carbon
(D) Iron oxide
17. The emissivity and the absorptivity of a real surface are equal for radiation with identical temperature and wavelength. This law is referred as
(A) Lambert’s low
(B) Krichoff’s law
(C) Planck’s law
(D) Wien’s displacement law
18. Which parameter should be highest for a radiation shield ?
(A) Absorptivity
(B) Reflectivity
(C) Transmissivity
(D) Emissivity
19. The gray body shape factor for radiant heat exchange between a small body (impassivity 0.4) in a large enclosure (impassivity 0.5) is
(A) 0.1
(B) 0.2
(C) 0.4
(D) 0.5
20. Free convection heat flow depends on all of the following, except :
(A) Density
(B) Coefficient of viscosity
(C) Gravitational force
(D) Velocity
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