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Browse complete papersWhich of the following is NOT a function of the power modulator in an electric drive system?
Regulating motor current during starting and braking
Selecting motoring or braking operation
Converting source energy to suitable form for the motor
Producing mechanical torque directly
Correct answer
Regulating motor current during starting and braking
Which of the following is the primary reason electric heating is more efficient than non-electric heating methods?
Electric heating produces higher temperatures
Electric heating requires less floor area
A larger percentage of heat produced is utilized
Electric heating equipment is cheaper
Correct answer
Electric heating produces higher temperatures
Heat transfer without actual movement of molecules, dependent on temperature gradient, occurs by:
Convection
Conduction
Radiation
Advection
Correct answer
Convection
According to Stefan-Boltzmann law, the net radiant heat transfer between two bodies is proportional to:
Difference of temperatures
Square of temperature difference
Difference of fourth power of absolute temperatures
Product of temperatures
Correct answer
Difference of temperatures
Which property of a heating element material enables precise temperature control during its operation?
High melting point
High emissivity
Low temperature coefficient of resistance
High mechanical strength
Correct answer
High melting point
A voltmeter with a 0-50V range has an accuracy of ±1% of full-scale. What is the percentage limiting error when the instrument reads 15V?
3.33%
7.5%
1.5%
0.3%
Correct answer
3.33%
A D' Arsonval galvanometer has flux denisty= \( 8 \times 10^{-3} \text{ Wb/m}^2 \), number of turns=300, length of coil=15mm, width of coil=30 mm, spring constant= \( 2.5 \times 10^{-9} \text{ Nm/rad} \), moment of intertia= \( 10 \times 10^{-9} \text{ Kg - m}^2 \), damping constant= \( 2 \times 10^{-9} \text{ Nm/rad - s}^{-1} \), resistance of coil= 80Ω . What is the deflection of the galvanometer for a current of 1μA ?
0.432 rad
0.215 rad
0.864 rad
1.02 rad
Correct answer
0.432 rad
A voltmeter with a full-scale range of 0-100V has a specified accuracy of ±1% of full-scale value. If the instrument indicates 50V, what is the maximum possible percentage error in the reading?
1%
2%
0.5%
4%
Correct answer
1%
Which of the following is classified as an integrating instrument in electrical measurements?
Ammeter
Voltmeter
Wattmeter
Energy Meter
Correct answer
Ammeter
How is a galvanometer protected from mechanical shock and induced EMFs during transport?
By connecting a critical damping resistance across its terminals
By short-circuiting its terminals
By keeping its terminals open-circuited
By connecting a capacitor across its terminals
Correct answer
By connecting a critical damping resistance across its terminals