Mechanical Engineering MCQs

A. Free electrons
B. Atoms colliding frequency
C. Low density
D. Porous body

A. 0.002
B. 0.02
C. 0.01
D. 0.1

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease depending on temperature

A. Change vapour into liquid
B. Change liquid into vapour
C. Increase the temperature of a liquid or vapour
D. Convert water into steam and superheat it

A. 0.1
B. 0.23
C. 0.42
D. 0.51

A. The time taken to attain the final temperature to be measured
B. The time taken to attain 50% of the value of initial temperature difference
C. The time taken to attain 63.2% of the value of initial temperature difference
D. Determined by the time taken to reach 100°c from 0°c

A. Hr (time)
B. Sqm (area)
C. °c (temperature)
D. Cm (thickness)

A. Steam
B. Solid ice
C. Melting ice
D. Water

A. Quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°c
B. Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°c
C. Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
D. All of the above

A. electric heater
B. steam condenser
C. melting of ice
D. refrigerator condenser coils