Related Questions

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces
A The more heat than produced by A.C. when flowing through the same circuit
B The same heat as produced by A.C. when flowing through the same circuit
C The less heat than produced by A.flowing through the same circuit
D None of the above
What is the name of the device used to convert alternating current into direct current ?
A Ammeter
B Galvanometer
C Rectifier
D Transformer
The latitude which passes through Sikkim also passes through
A Haryana
B Rajasthan
C Uttarakhand
D Himachal Pradesh
The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
A Operational yield
B Relative yield
C Selectivity
D None of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.
A Increase by 1.8
B Decrease by 22
C Increase by 21.6
D None of these
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.
A No change
B Decrease
C Increase
D Exponential decrease
Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current?
A P = IE
B P = E2/R
C P = I2R
D I = P/E
E None of the above
In fuel cell, the ______ energy is converted into electrical energy.
A mechanical
B chemical
C heat
D sound
The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?
A Conduction
B Convection
C Radiation
D All of the above

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