Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage is to be rectified. (a) Suggest one advantage of full-wave rectification as compared with half-wave rectification.&n...

2009 Winter

Theory

CH24 - ALTERNATING CURRENTS

A student is asked to design a circuit by which a direct voltage of peak value 9.0V is obtained from a 240V alternating supply. The student uses a tra...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

(a) Explain what is meant by the $\textit{root-mean-square}$ (r.m.s.) value of an alternating voltage.  [2] (b) An alternating voltage $V$ is re...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the current $I$ in a resistor is shown in Fig. 6.1. The variation of the current with time is sinusoidal. (a) Expla...

2010 Winter

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1.(a) Use Fig. 6.1 to state (i) t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1. (a) Use Fig. 6.1 to state ...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The components for a bridge rectifier are shown in Fig. 5.1. (a) Complete the circuit of Fig. 5.1 by showing the connections of the supply and of t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage supply is connected to a bridge rectifier consisting of four ideal diodes. The output of the rectifier is connected t...

2012 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which is an SI base unit?

2015 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which pair contains one vector and one scalar quantity?

2015 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

When a constant braking force is applied to a vehicle moving at speed $v$, the distance $d$ moved by the vehicle in coming to rest is given by the exp...

2015 Summer

MCQ

CH2 - MEASUREMENT TECHNIQUES

A whale produces sound waves of frequency 5 Hz. The waves are detected by a microphone and displayed on an oscilloscope. What is the time-base setting...

2015 Summer

MCQ

CH2 - MEASUREMENT TECHNIQUES

The angular deflection of the needle of an ammeter varies with the current in the ammeter as shown in the graph. Which diagram could represent the ap...

2015 Summer

MCQ

CH2 - MEASUREMENT TECHNIQUES

The strain energy $W$ of a spring is determined from its spring constant $k$ and extension $x$. The spring obeys Hooke's law and the value of $W$ is c...

2015 Summer

MCQ

CH3 - KINEMATICS

A sphere is released and falls. Its initial acceleration reduces until it eventually begins to travel at constant terminal velocity. Which displacemen...

2015 Summer

MCQ

CH3 - KINEMATICS

An insect jumps with an initial vertical velocity of 1.0 $\text{m s}^{-1}$, reaching a maximum height of 3.5 $\times 10^{-2} \text{m}$. Assume the dec...

2015 Summer

MCQ

CH3 - KINEMATICS

A body having uniform acceleration $a$ increases its velocity from $u$ to $v$ in time $t$. Which expression would not give a correct value for the bo...

2015 Summer

MCQ

CH4 - DYNAMICS

What is a reasonable estimate of the average gravitational force acting on a fully grown woman standing on the Earth?

2015 Summer