RQS (2023)

A coil has a 50 ohms resistance and a 70 ohms reactance. A capacitor is connected in parallel to produce resonance. The source voltage is 120V. What is the power drawn by the circuit?

• 162W

• 132W

• 97W

• 52W

Two electrons in a vacuum experience a force of 2 x 10^-15 N. How far apart are the electrons?

• 3.4x10^-7 m

• 9.6x10^-7 m

• 2.84x10^-12 m

• 5.05x10^-12

The pitch factor for third harmonic in an alternator having 18 slots per pole and coil span 5/6 of pole pitch is ____.

• 0.707

• 0.259

• 0.966

• 1

When two capacitors of reactances 10 ohms and 20 ohms are connected in parallel across a 100V supply, total VAR drawn will be ________.

• 500

• 2

• 1500

• 15

Overvoltage relay device function number.

• 64

• 56

• 60

• 59

A test used to determine the equivalent resistance of an induction motor is ______.

• No-load Test

• Short-Circuit Test

• Blocked-rotor Test

• Polarity Test

A transformer has 4% resistance and 6% reactance drop. What is the voltage regulation at full load 0.8 pf lagging?

• 6%

• 6.4%

• 6.8%

• 7.2%

The unit of retentivity is

• ampere turn

• ampere turn/weber

• ampere turn/meter

• dimensionless

Three 10 ohm resistances are connected delta on a balanced three phase source. If the equation of the phase a is 120sinwt, what is the equation of the phase a line current?

• 36sinwt

• 13.15sin(wt-30deg)

• 11.22sin(wt+30deg)

• 11.88sin(wt-56.6deg)

A 250/6,600 V, 50 hz single - phase transformer has a core of cross section 600 sq cm and the flux density in it is 0.707 Tesla. Determine the number of turns in the primary winding.

• 27

• 19

• 23

• 17