# RRB JE ELECTRICAL QUIZ PRACTICE # RRB JE ELECTRICAL QUIZ

 Which of the subsequent can vary with ac, but never with dc? RRB JE ELECTRICAL QUIZ

1. Power
2. Voltage
3. Frequency
4. Amplitude

Frequency

 If all other aspects are kept constant, the inductance of the air-core coil is not affected by RRB JE ELECTRICAL QUIZ

1. The frequency
2. The number of turns
3. The diameter of the coil
4. The length of the coil

The frequency

 The length of time between a point in one cycle and the same point in the next cycle of an ac wave is the

1. Frequency
2. Magnitude
3. Period
4. Polarity

Period

 Capacitance acts to store electrical energy as RRB JE ELECTRICAL QUIZ

1. Current
2. Voltage
3. A magnetic field
4. An electric field

An electric field

######  On a spectrum analyser, a ac signal having only one frequency component looks like RRB JE ELECTRICAL QUIZ
1.  single pip
2.  sine wave
3. square wave
4.  sawtooth wave

A single pip

 A ferromagnetic core is placed in the inductor to RRB JE ELECTRICAL QUIZ

1. Increase the current carrying capacity
2. Increase the inductance
3. Limit the current
4. Reduce the inductance

Increase the inductance

 The period of an ac wave, in seconds is RRB JE ELECTRICAL QUIZ

1. The same as the frequency in hertz
2. Not related to the frequency in any way
3. Equal to 1 divided by the frequency in hertz
4. The Equal to the peak amplitude in volts divided by the frequency in hertz

Equal to 1 divided by the frequency in hertz

######  An inductor works by RRB JE ELECTRICAL QUIZ
1. Charging a piece of wire
2. Storing energy as a magnetic field
3. Choking off dc
4. Introducing resistance into a field

Storing energy as a magnetic field

 As capacitor plate area upsurges RRB JE ELECTRICAL QUIZ

1. A capacitance increases
2. The capacitance decreases
3. A  capacitance does not change
4. The current handling ability drops

The capacitance increases

 In a small inductance RRB JE ELECTRICAL QUIZ

1. Energy is stored and released slowly
2. The current flow is always large
3. The current flow is always slow
4. Energy is stored and released quickly

Energy is stored and released quickly

 In ac circuit, the ratio of kW/kVA is

1. power factor
2. form factor
4. diversity factor

power factor

######  Suppose that two ac waves have the same frequency but differ in phase by exactly 1/20 of a cycle. What is the phase difference between these two waves?
1. 18 deg
2. 20 deg
3. 36 deg
4. 5.73 deg

18 deg

 The unit of inductance is

1. Mho
2. hendry
3. ohm

hendry

 What is the angular frequency of the ac signal having a frequency of 1770Hz

4. Data insufficient

######  Thevenin’s equivalent circuit consists of
1. series combination of Rth, Eth, Rl
2. series combination of Rth, Eth
3. parallel combination of Rth, Eth, Rl
4. parallel combination of Rth, Eth

series combination of Rth, Eth

 The frequency of DC supply is

1. 16 2/3 Hz
2. 60 Hz
3. 50 Hz
4. 0 Hz

0 Hz

 Load factor is defined as the ratio of

1. max demand/ average demand
3. average demand/ max. demand

 Q factor of an inductive coil is given by

1. 2π fL/R
2. 2π fr/R
3. R/Z
4. lr/l

2π fr/R

 The RMS value of sinusoidal 100V peak to peak is

1. 100 V
2. 50/√2 V
3. 50 V
4. 100/√2 V

50/√2 V

 Which of the following bulbs will have the least resistance?

1. 220V, 60W
2. 220V, 100W
3. 115V, 60W
4. 115V, 100W

115V, 100W 